diff --git a/docs/02_concepts/09_streaming.mdx b/docs/02_concepts/09_streaming.mdx
index b365e34a..c62da01e 100644
--- a/docs/02_concepts/09_streaming.mdx
+++ b/docs/02_concepts/09_streaming.mdx
@@ -18,7 +18,7 @@ Supported streaming methods:
 - [`KeyValueStoreClient.stream_record`](/reference/class/KeyValueStoreClient#stream_record) - Stream key-value store records as raw data.
 - [`LogClient.stream`](/reference/class/LogClient#stream) - Stream logs in real time.
 
-These methods return a raw, context-managed `httpx.Response` object. The response must be consumed within a with block to ensure that the connection is closed automatically, preventing memory leaks or unclosed connections.
+These methods return a raw, context-managed `impit.Response` object. The response must be consumed within a with block to ensure that the connection is closed automatically, preventing memory leaks or unclosed connections.
 
 The following example demonstrates how to stream the logs of an Actor run incrementally:
 
diff --git a/docs/02_concepts/code/01_async_support.py b/docs/02_concepts/code/01_async_support.py
index 28186519..22cc390e 100644
--- a/docs/02_concepts/code/01_async_support.py
+++ b/docs/02_concepts/code/01_async_support.py
@@ -17,8 +17,8 @@ async def main() -> None:
     # Stream the logs
     async with log_client.stream() as async_log_stream:
         if async_log_stream:
-            async for line in async_log_stream.aiter_lines():
-                print(line)
+            async for bytes_chunk in async_log_stream.aiter_bytes():
+                print(bytes_chunk)
 
 
 if __name__ == '__main__':
diff --git a/docs/02_concepts/code/09_streaming_async.py b/docs/02_concepts/code/09_streaming_async.py
index 6ff097a8..5459784e 100644
--- a/docs/02_concepts/code/09_streaming_async.py
+++ b/docs/02_concepts/code/09_streaming_async.py
@@ -10,5 +10,5 @@ async def main() -> None:
 
     async with log_client.stream() as log_stream:
         if log_stream:
-            for line in log_stream.iter_lines():
-                print(line)
+            async for bytes_chunk in log_stream.aiter_bytes():
+                print(bytes_chunk)
diff --git a/docs/02_concepts/code/09_streaming_sync.py b/docs/02_concepts/code/09_streaming_sync.py
index 4eb0093d..e7617ab3 100644
--- a/docs/02_concepts/code/09_streaming_sync.py
+++ b/docs/02_concepts/code/09_streaming_sync.py
@@ -10,5 +10,5 @@ def main() -> None:
 
     with log_client.stream() as log_stream:
         if log_stream:
-            for line in log_stream.iter_lines():
-                print(line)
+            for bytes_chunk in log_stream.iter_bytes():
+                print(bytes_chunk)
diff --git a/docs/04_upgrading/upgrading_to_v2.md b/docs/04_upgrading/upgrading_to_v2.md
new file mode 100644
index 00000000..9de34225
--- /dev/null
+++ b/docs/04_upgrading/upgrading_to_v2.md
@@ -0,0 +1,18 @@
+---
+id: upgrading-to-v2
+title: Upgrading to v2
+---
+
+This page summarizes the breaking changes between Apify Python API client v1.x and v2.0.
+
+## Python version support
+
+<!-- TODO -->
+
+## Change underlying HTTP library
+
+In v2.0, the Apify Python API client switched from using `httpx` to [`impit`](https://github.com/apify/impit) as the underlying HTTP library.
+
+## Update signature of methods
+
+<!-- TODO -->
diff --git a/pyproject.toml b/pyproject.toml
index ff07ea26..634e43b5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,7 +27,7 @@ keywords = ["apify", "api", "client", "automation", "crawling", "scraping"]
 dependencies = [
     "apify-shared<2.0.0",
     "colorama>=0.4.0",
-    "httpx>=0.25",
+    "impit>=0.5.2",
     "more_itertools>=10.0.0",
 ]
 
@@ -54,7 +54,6 @@ dev = [
     "pytest~=8.4.0",
     "pytest-httpserver>=1.1.3",
     "redbaron~=0.9.0",
-    "respx~=0.22.0",
     "ruff~=0.12.0",
     "setuptools", # setuptools are used by pytest but not explicitly required
     "types-colorama~=0.4.15.20240106",
@@ -175,7 +174,7 @@ warn_unused_ignores = true
 exclude = []
 
 [[tool.mypy.overrides]]
-module = ["pandas", "respx"]
+module = ["pandas"]
 ignore_missing_imports = true
 
 [tool.basedpyright]
diff --git a/src/apify_client/_errors.py b/src/apify_client/_errors.py
index 87a91f2b..6b3d8db2 100644
--- a/src/apify_client/_errors.py
+++ b/src/apify_client/_errors.py
@@ -1,6 +1,8 @@
 from __future__ import annotations
 
-import httpx
+import json as jsonlib
+
+import impit
 from apify_shared.utils import ignore_docs
 
 
@@ -17,12 +19,13 @@ class ApifyApiError(ApifyClientError):
     """
 
     @ignore_docs
-    def __init__(self, response: httpx.Response, attempt: int) -> None:
+    def __init__(self, response: impit.Response, attempt: int, method: str = 'GET') -> None:
         """Initialize a new instance.
 
         Args:
             response: The response to the failed API call.
             attempt: Which attempt was the request that failed.
+            method: The HTTP method used for the request.
         """
         self.message: str | None = None
         self.type: str | None = None
@@ -30,7 +33,7 @@ def __init__(self, response: httpx.Response, attempt: int) -> None:
 
         self.message = f'Unexpected error: {response.text}'
         try:
-            response_data = response.json()
+            response_data = jsonlib.loads(response.text)
             if 'error' in response_data:
                 self.message = response_data['error']['message']
                 self.type = response_data['error']['type']
@@ -44,7 +47,7 @@ def __init__(self, response: httpx.Response, attempt: int) -> None:
         self.name = 'ApifyApiError'
         self.status_code = response.status_code
         self.attempt = attempt
-        self.http_method = response.request.method
+        self.http_method = method
 
         # TODO: self.client_method   # noqa: TD003
         # TODO: self.original_stack  # noqa: TD003
@@ -61,7 +64,7 @@ class InvalidResponseBodyError(ApifyClientError):
     """
 
     @ignore_docs
-    def __init__(self, response: httpx.Response) -> None:
+    def __init__(self, response: impit.Response) -> None:
         """Initialize a new instance.
 
         Args:
@@ -80,8 +83,8 @@ def is_retryable_error(exc: Exception) -> bool:
         exc,
         (
             InvalidResponseBodyError,
-            httpx.NetworkError,
-            httpx.TimeoutException,
-            httpx.RemoteProtocolError,
+            impit.NetworkError,
+            impit.TimeoutException,
+            impit.RemoteProtocolError,
         ),
     )
diff --git a/src/apify_client/_http_client.py b/src/apify_client/_http_client.py
index 74d98553..d6e2f1f6 100644
--- a/src/apify_client/_http_client.py
+++ b/src/apify_client/_http_client.py
@@ -8,8 +8,9 @@
 from http import HTTPStatus
 from importlib import metadata
 from typing import TYPE_CHECKING, Any
+from urllib.parse import urlencode
 
-import httpx
+import impit
 from apify_shared.utils import ignore_docs, is_content_type_json, is_content_type_text, is_content_type_xml
 
 from apify_client._errors import ApifyApiError, InvalidResponseBodyError, is_retryable_error
@@ -59,13 +60,13 @@ def __init__(
         if token is not None:
             headers['Authorization'] = f'Bearer {token}'
 
-        self.httpx_client = httpx.Client(headers=headers, follow_redirects=True, timeout=timeout_secs)
-        self.httpx_async_client = httpx.AsyncClient(headers=headers, follow_redirects=True, timeout=timeout_secs)
+        self.impit_client = impit.Client(headers=headers, follow_redirects=True, timeout=timeout_secs)
+        self.impit_async_client = impit.AsyncClient(headers=headers, follow_redirects=True, timeout=timeout_secs)
 
         self.stats = stats or Statistics()
 
     @staticmethod
-    def _maybe_parse_response(response: httpx.Response) -> Any:
+    def _maybe_parse_response(response: impit.Response) -> Any:
         if response.status_code == HTTPStatus.NO_CONTENT:
             return None
 
@@ -75,7 +76,7 @@ def _maybe_parse_response(response: httpx.Response) -> Any:
 
         try:
             if is_content_type_json(content_type):
-                return response.json()
+                return jsonlib.loads(response.text)
             elif is_content_type_xml(content_type) or is_content_type_text(content_type):  # noqa: RET505
                 return response.text
             else:
@@ -131,6 +132,21 @@ def _prepare_request_call(
             data,
         )
 
+    def _build_url_with_params(self, url: str, params: dict | None = None) -> str:
+        if not params:
+            return url
+
+        param_pairs: list[tuple[str, str]] = []
+        for key, value in params.items():
+            if isinstance(value, list):
+                param_pairs.extend((key, str(v)) for v in value)
+            else:
+                param_pairs.append((key, str(value)))
+
+        query_string = urlencode(param_pairs)
+
+        return f'{url}?{query_string}'
+
 
 class HTTPClient(_BaseHTTPClient):
     def call(
@@ -145,7 +161,7 @@ def call(
         stream: bool | None = None,
         parse_response: bool | None = True,
         timeout_secs: int | None = None,
-    ) -> httpx.Response:
+    ) -> impit.Response:
         log_context.method.set(method)
         log_context.url.set(url)
 
@@ -156,34 +172,26 @@ def call(
 
         headers, params, content = self._prepare_request_call(headers, params, data, json)
 
-        httpx_client = self.httpx_client
+        impit_client = self.impit_client
 
-        def _make_request(stop_retrying: Callable, attempt: int) -> httpx.Response:
+        def _make_request(stop_retrying: Callable, attempt: int) -> impit.Response:
             log_context.attempt.set(attempt)
             logger.debug('Sending request')
 
             self.stats.requests += 1
 
             try:
-                request = httpx_client.build_request(
+                # Increase timeout with each attempt. Max timeout is bounded by the client timeout.
+                timeout = min(self.timeout_secs, (timeout_secs or self.timeout_secs) * 2 ** (attempt - 1))
+
+                url_with_params = self._build_url_with_params(url, params)
+
+                response = impit_client.request(
                     method=method,
-                    url=url,
+                    url=url_with_params,
                     headers=headers,
-                    params=params,
                     content=content,
-                )
-
-                # Increase timeout with each attempt. Max timeout is bounded by the client timeout.
-                timeout = min(self.timeout_secs, (timeout_secs or self.timeout_secs) * 2 ** (attempt - 1))
-                request.extensions['timeout'] = {
-                    'connect': timeout,
-                    'pool': timeout,
-                    'read': timeout,
-                    'write': timeout,
-                }
-
-                response = httpx_client.send(
-                    request=request,
+                    timeout=timeout,
                     stream=stream or False,
                 )
 
@@ -217,7 +225,7 @@ def _make_request(stop_retrying: Callable, attempt: int) -> httpx.Response:
 
             # Read the response in case it is a stream, so we can raise the error properly
             response.read()
-            raise ApifyApiError(response, attempt)
+            raise ApifyApiError(response, attempt, method=method)
 
         return retry_with_exp_backoff(
             _make_request,
@@ -241,7 +249,7 @@ async def call(
         stream: bool | None = None,
         parse_response: bool | None = True,
         timeout_secs: int | None = None,
-    ) -> httpx.Response:
+    ) -> impit.Response:
         log_context.method.set(method)
         log_context.url.set(url)
 
@@ -252,31 +260,23 @@ async def call(
 
         headers, params, content = self._prepare_request_call(headers, params, data, json)
 
-        httpx_async_client = self.httpx_async_client
+        impit_async_client = self.impit_async_client
 
-        async def _make_request(stop_retrying: Callable, attempt: int) -> httpx.Response:
+        async def _make_request(stop_retrying: Callable, attempt: int) -> impit.Response:
             log_context.attempt.set(attempt)
             logger.debug('Sending request')
             try:
-                request = httpx_async_client.build_request(
+                # Increase timeout with each attempt. Max timeout is bounded by the client timeout.
+                timeout = min(self.timeout_secs, (timeout_secs or self.timeout_secs) * 2 ** (attempt - 1))
+
+                url_with_params = self._build_url_with_params(url, params)
+
+                response = await impit_async_client.request(
                     method=method,
-                    url=url,
+                    url=url_with_params,
                     headers=headers,
-                    params=params,
                     content=content,
-                )
-
-                # Increase timeout with each attempt. Max timeout is bounded by the client timeout.
-                timeout = min(self.timeout_secs, (timeout_secs or self.timeout_secs) * 2 ** (attempt - 1))
-                request.extensions['timeout'] = {
-                    'connect': timeout,
-                    'pool': timeout,
-                    'read': timeout,
-                    'write': timeout,
-                }
-
-                response = await httpx_async_client.send(
-                    request=request,
+                    timeout=timeout,
                     stream=stream or False,
                 )
 
@@ -310,7 +310,7 @@ async def _make_request(stop_retrying: Callable, attempt: int) -> httpx.Response
 
             # Read the response in case it is a stream, so we can raise the error properly
             await response.aread()
-            raise ApifyApiError(response, attempt)
+            raise ApifyApiError(response, attempt, method=method)
 
         return await retry_with_exp_backoff_async(
             _make_request,
diff --git a/src/apify_client/clients/base/actor_job_base_client.py b/src/apify_client/clients/base/actor_job_base_client.py
index 2b63c834..13c23c40 100644
--- a/src/apify_client/clients/base/actor_job_base_client.py
+++ b/src/apify_client/clients/base/actor_job_base_client.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import asyncio
+import json as jsonlib
 import math
 import time
 from datetime import datetime, timezone
@@ -39,7 +40,7 @@ def _wait_for_finish(self, wait_secs: int | None = None) -> dict | None:
                     method='GET',
                     params=self._params(waitForFinish=wait_for_finish),
                 )
-                job = parse_date_fields(pluck_data(response.json()))
+                job = parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
                 seconds_elapsed = math.floor((datetime.now(timezone.utc) - started_at).total_seconds())
                 if ActorJobStatus(job['status']).is_terminal or (
@@ -70,7 +71,7 @@ def _abort(self, *, gracefully: bool | None = None) -> dict:
             method='POST',
             params=self._params(gracefully=gracefully),
         )
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
 
 @ignore_docs
@@ -94,7 +95,7 @@ async def _wait_for_finish(self, wait_secs: int | None = None) -> dict | None:
                     method='GET',
                     params=self._params(waitForFinish=wait_for_finish),
                 )
-                job = parse_date_fields(pluck_data(response.json()))
+                job = parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
                 seconds_elapsed = math.floor((datetime.now(timezone.utc) - started_at).total_seconds())
                 if ActorJobStatus(job['status']).is_terminal or (
@@ -125,4 +126,4 @@ async def _abort(self, *, gracefully: bool | None = None) -> dict:
             method='POST',
             params=self._params(gracefully=gracefully),
         )
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
diff --git a/src/apify_client/clients/base/resource_client.py b/src/apify_client/clients/base/resource_client.py
index 37e2d3b0..8a8ef279 100644
--- a/src/apify_client/clients/base/resource_client.py
+++ b/src/apify_client/clients/base/resource_client.py
@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+import json as jsonlib
+
 from apify_shared.utils import ignore_docs, parse_date_fields
 
 from apify_client._errors import ApifyApiError
@@ -20,7 +22,7 @@ def _get(self, timeout_secs: int | None = None) -> dict | None:
                 timeout_secs=timeout_secs,
             )
 
-            return parse_date_fields(pluck_data(response.json()))
+            return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
         except ApifyApiError as exc:
             catch_not_found_or_throw(exc)
@@ -36,7 +38,7 @@ def _update(self, updated_fields: dict, timeout_secs: int | None = None) -> dict
             timeout_secs=timeout_secs,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     def _delete(self, timeout_secs: int | None = None) -> None:
         try:
@@ -64,7 +66,7 @@ async def _get(self, timeout_secs: int | None = None) -> dict | None:
                 timeout_secs=timeout_secs,
             )
 
-            return parse_date_fields(pluck_data(response.json()))
+            return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
         except ApifyApiError as exc:
             catch_not_found_or_throw(exc)
@@ -80,7 +82,7 @@ async def _update(self, updated_fields: dict, timeout_secs: int | None = None) -
             timeout_secs=timeout_secs,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     async def _delete(self, timeout_secs: int | None = None) -> None:
         try:
diff --git a/src/apify_client/clients/base/resource_collection_client.py b/src/apify_client/clients/base/resource_collection_client.py
index e4984fa9..f007c596 100644
--- a/src/apify_client/clients/base/resource_collection_client.py
+++ b/src/apify_client/clients/base/resource_collection_client.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import json as jsonlib
 from typing import Any, Generic, TypeVar
 
 from apify_shared.utils import ignore_docs, parse_date_fields
@@ -53,7 +54,7 @@ def _list(self, **kwargs: Any) -> ListPage:
             params=self._params(**kwargs),
         )
 
-        return ListPage(parse_date_fields(pluck_data(response.json())))
+        return ListPage(parse_date_fields(pluck_data(jsonlib.loads(response.text))))
 
     def _create(self, resource: dict) -> dict:
         response = self.http_client.call(
@@ -63,7 +64,7 @@ def _create(self, resource: dict) -> dict:
             json=resource,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     def _get_or_create(self, name: str | None = None, resource: dict | None = None) -> dict:
         response = self.http_client.call(
@@ -73,7 +74,7 @@ def _get_or_create(self, name: str | None = None, resource: dict | None = None)
             json=resource,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
 
 @ignore_docs
@@ -87,7 +88,7 @@ async def _list(self, **kwargs: Any) -> ListPage:
             params=self._params(**kwargs),
         )
 
-        return ListPage(parse_date_fields(pluck_data(response.json())))
+        return ListPage(parse_date_fields(pluck_data(jsonlib.loads(response.text))))
 
     async def _create(self, resource: dict) -> dict:
         response = await self.http_client.call(
@@ -97,7 +98,7 @@ async def _create(self, resource: dict) -> dict:
             json=resource,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     async def _get_or_create(
         self,
@@ -111,4 +112,4 @@ async def _get_or_create(
             json=resource,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
diff --git a/src/apify_client/clients/resource_clients/actor.py b/src/apify_client/clients/resource_clients/actor.py
index a2473699..9b64795b 100644
--- a/src/apify_client/clients/resource_clients/actor.py
+++ b/src/apify_client/clients/resource_clients/actor.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import json as jsonlib
 from typing import TYPE_CHECKING, Any, Literal
 
 from apify_shared.utils import (
@@ -276,7 +277,7 @@ def start(
             params=request_params,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     def call(
         self,
@@ -386,7 +387,7 @@ def build(
             params=request_params,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     def builds(self) -> BuildCollectionClient:
         """Retrieve a client for the builds of this Actor."""
@@ -417,7 +418,7 @@ async def default_build(
         )
 
         response = self.http_client.call(url=self._url('builds/default'), method='GET', params=request_params)
-        data = pluck_data(response.json())
+        data = pluck_data(jsonlib.loads(response.text))
 
         return BuildClient(
             base_url=self.base_url,
@@ -681,7 +682,7 @@ async def start(
             params=request_params,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     async def call(
         self,
@@ -795,7 +796,7 @@ async def build(
             params=request_params,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     def builds(self) -> BuildCollectionClientAsync:
         """Retrieve a client for the builds of this Actor."""
@@ -830,7 +831,7 @@ async def default_build(
             method='GET',
             params=request_params,
         )
-        data = pluck_data(response.json())
+        data = pluck_data(jsonlib.loads(response.text))
 
         return BuildClientAsync(
             base_url=self.base_url,
diff --git a/src/apify_client/clients/resource_clients/build.py b/src/apify_client/clients/resource_clients/build.py
index bbc91f59..b427fcfa 100644
--- a/src/apify_client/clients/resource_clients/build.py
+++ b/src/apify_client/clients/resource_clients/build.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import json as jsonlib
 from typing import Any
 
 from apify_shared.utils import ignore_docs
@@ -56,7 +57,7 @@ def get_open_api_definition(self) -> dict | None:
             method='GET',
         )
 
-        response_data: dict = response.json()
+        response_data: dict = jsonlib.loads(response.text)
 
         return response_data
 
@@ -133,7 +134,7 @@ async def get_open_api_definition(self) -> dict | None:
             method='GET',
         )
 
-        response_data: dict = response.json()
+        response_data: dict = jsonlib.loads(response.text)
 
         return response_data
 
diff --git a/src/apify_client/clients/resource_clients/dataset.py b/src/apify_client/clients/resource_clients/dataset.py
index 368eef0b..19e98bda 100644
--- a/src/apify_client/clients/resource_clients/dataset.py
+++ b/src/apify_client/clients/resource_clients/dataset.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import json as jsonlib
 import warnings
 from contextlib import asynccontextmanager, contextmanager
 from typing import TYPE_CHECKING, Any
@@ -14,7 +15,7 @@
 if TYPE_CHECKING:
     from collections.abc import AsyncIterator, Iterator
 
-    import httpx
+    import impit
     from apify_shared.consts import StorageGeneralAccess
     from apify_shared.types import JSONSerializable
 
@@ -137,7 +138,7 @@ def list_items(
             params=request_params,
         )
 
-        data = response.json()
+        data = jsonlib.loads(response.text)
 
         return ListPage(
             {
@@ -446,7 +447,7 @@ def stream_items(
         skip_hidden: bool | None = None,
         xml_root: str | None = None,
         xml_row: str | None = None,
-    ) -> Iterator[httpx.Response]:
+    ) -> Iterator[impit.Response]:
         """Retrieve the items in the dataset as a stream.
 
         https://docs.apify.com/api/v2#/reference/datasets/item-collection/get-items
@@ -565,7 +566,7 @@ def get_statistics(self) -> dict | None:
                 params=self._params(),
                 timeout_secs=_SMALL_TIMEOUT,
             )
-            return pluck_data(response.json())
+            return pluck_data(jsonlib.loads(response.text))
         except ApifyApiError as exc:
             catch_not_found_or_throw(exc)
 
@@ -687,7 +688,7 @@ async def list_items(
             params=request_params,
         )
 
-        data = response.json()
+        data = jsonlib.loads(response.text)
 
         return ListPage(
             {
@@ -903,7 +904,7 @@ async def stream_items(
         skip_hidden: bool | None = None,
         xml_root: str | None = None,
         xml_row: str | None = None,
-    ) -> AsyncIterator[httpx.Response]:
+    ) -> AsyncIterator[impit.Response]:
         """Retrieve the items in the dataset as a stream.
 
         https://docs.apify.com/api/v2#/reference/datasets/item-collection/get-items
@@ -1022,7 +1023,7 @@ async def get_statistics(self) -> dict | None:
                 params=self._params(),
                 timeout_secs=_SMALL_TIMEOUT,
             )
-            return pluck_data(response.json())
+            return pluck_data(jsonlib.loads(response.text))
         except ApifyApiError as exc:
             catch_not_found_or_throw(exc)
 
diff --git a/src/apify_client/clients/resource_clients/key_value_store.py b/src/apify_client/clients/resource_clients/key_value_store.py
index 7100d475..ccc254f8 100644
--- a/src/apify_client/clients/resource_clients/key_value_store.py
+++ b/src/apify_client/clients/resource_clients/key_value_store.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import json as jsonlib
 import warnings
 from contextlib import asynccontextmanager, contextmanager
 from http import HTTPStatus
@@ -99,7 +100,7 @@ def list_keys(
             timeout_secs=_MEDIUM_TIMEOUT,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     def get_record(self, key: str, *, as_bytes: bool = False, as_file: bool = False) -> dict | None:
         """Retrieve the given record from the key-value store.
@@ -367,7 +368,7 @@ async def list_keys(
             timeout_secs=_MEDIUM_TIMEOUT,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     async def get_record(self, key: str) -> dict | None:
         """Retrieve the given record from the key-value store.
diff --git a/src/apify_client/clients/resource_clients/log.py b/src/apify_client/clients/resource_clients/log.py
index bca8b07a..e007f667 100644
--- a/src/apify_client/clients/resource_clients/log.py
+++ b/src/apify_client/clients/resource_clients/log.py
@@ -21,7 +21,7 @@
     from collections.abc import AsyncIterator, Iterator
     from types import TracebackType
 
-    import httpx
+    import impit
     from typing_extensions import Self
 
     from apify_client.clients import RunClient, RunClientAsync
@@ -87,7 +87,7 @@ def get_as_bytes(self, *, raw: bool = False) -> bytes | None:
         return None
 
     @contextmanager
-    def stream(self, *, raw: bool = False) -> Iterator[httpx.Response | None]:
+    def stream(self, *, raw: bool = False) -> Iterator[impit.Response | None]:
         """Retrieve the log as a stream.
 
         https://docs.apify.com/api/v2#/reference/logs/log/get-log
@@ -177,7 +177,7 @@ async def get_as_bytes(self, *, raw: bool = False) -> bytes | None:
         return None
 
     @asynccontextmanager
-    async def stream(self, *, raw: bool = False) -> AsyncIterator[httpx.Response | None]:
+    async def stream(self, *, raw: bool = False) -> AsyncIterator[impit.Response | None]:
         """Retrieve the log as a stream.
 
         https://docs.apify.com/api/v2#/reference/logs/log/get-log
diff --git a/src/apify_client/clients/resource_clients/request_queue.py b/src/apify_client/clients/resource_clients/request_queue.py
index 7470c84f..d6716b33 100644
--- a/src/apify_client/clients/resource_clients/request_queue.py
+++ b/src/apify_client/clients/resource_clients/request_queue.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import asyncio
+import json as jsonlib
 import logging
 import math
 from collections.abc import Iterable
@@ -116,7 +117,7 @@ def list_head(self, *, limit: int | None = None) -> dict:
             timeout_secs=_SMALL_TIMEOUT,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     def list_and_lock_head(self, *, lock_secs: int, limit: int | None = None) -> dict:
         """Retrieve a given number of unlocked requests from the beginning of the queue and lock them for a given time.
@@ -139,7 +140,7 @@ def list_and_lock_head(self, *, lock_secs: int, limit: int | None = None) -> dic
             timeout_secs=_MEDIUM_TIMEOUT,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     def add_request(self, request: dict, *, forefront: bool | None = None) -> dict:
         """Add a request to the queue.
@@ -163,7 +164,7 @@ def add_request(self, request: dict, *, forefront: bool | None = None) -> dict:
             timeout_secs=_SMALL_TIMEOUT,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     def get_request(self, request_id: str) -> dict | None:
         """Retrieve a request from the queue.
@@ -183,7 +184,7 @@ def get_request(self, request_id: str) -> dict | None:
                 params=self._params(),
                 timeout_secs=_SMALL_TIMEOUT,
             )
-            return parse_date_fields(pluck_data(response.json()))
+            return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
         except ApifyApiError as exc:
             catch_not_found_or_throw(exc)
@@ -214,7 +215,7 @@ def update_request(self, request: dict, *, forefront: bool | None = None) -> dic
             timeout_secs=_MEDIUM_TIMEOUT,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     def delete_request(self, request_id: str) -> None:
         """Delete a request from the queue.
@@ -260,7 +261,7 @@ def prolong_request_lock(
             timeout_secs=_MEDIUM_TIMEOUT,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     def delete_request_lock(self, request_id: str, *, forefront: bool | None = None) -> None:
         """Delete the lock on a request.
@@ -349,7 +350,7 @@ def batch_add_requests(
                 timeout_secs=_MEDIUM_TIMEOUT,
             )
 
-            response_parsed = parse_date_fields(pluck_data(response.json()))
+            response_parsed = parse_date_fields(pluck_data(jsonlib.loads(response.text)))
             processed_requests.extend(response_parsed.get('processedRequests', []))
             unprocessed_requests.extend(response_parsed.get('unprocessedRequests', []))
 
@@ -376,7 +377,7 @@ def batch_delete_requests(self, requests: list[dict]) -> dict:
             timeout_secs=_SMALL_TIMEOUT,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     def list_requests(
         self,
@@ -401,7 +402,7 @@ def list_requests(
             timeout_secs=_MEDIUM_TIMEOUT,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     def unlock_requests(self: RequestQueueClient) -> dict:
         """Unlock all requests in the queue, which were locked by the same clientKey or from the same Actor run.
@@ -419,7 +420,7 @@ def unlock_requests(self: RequestQueueClient) -> dict:
             params=request_params,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
 
 class RequestQueueClientAsync(ResourceClientAsync):
@@ -497,7 +498,7 @@ async def list_head(self, *, limit: int | None = None) -> dict:
             timeout_secs=_SMALL_TIMEOUT,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     async def list_and_lock_head(self, *, lock_secs: int, limit: int | None = None) -> dict:
         """Retrieve a given number of unlocked requests from the beginning of the queue and lock them for a given time.
@@ -520,7 +521,7 @@ async def list_and_lock_head(self, *, lock_secs: int, limit: int | None = None)
             timeout_secs=_MEDIUM_TIMEOUT,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     async def add_request(self, request: dict, *, forefront: bool | None = None) -> dict:
         """Add a request to the queue.
@@ -544,7 +545,7 @@ async def add_request(self, request: dict, *, forefront: bool | None = None) ->
             timeout_secs=_SMALL_TIMEOUT,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     async def get_request(self, request_id: str) -> dict | None:
         """Retrieve a request from the queue.
@@ -564,7 +565,7 @@ async def get_request(self, request_id: str) -> dict | None:
                 params=self._params(),
                 timeout_secs=_SMALL_TIMEOUT,
             )
-            return parse_date_fields(pluck_data(response.json()))
+            return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
         except ApifyApiError as exc:
             catch_not_found_or_throw(exc)
@@ -595,7 +596,7 @@ async def update_request(self, request: dict, *, forefront: bool | None = None)
             timeout_secs=_MEDIUM_TIMEOUT,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     async def delete_request(self, request_id: str) -> None:
         """Delete a request from the queue.
@@ -639,7 +640,7 @@ async def prolong_request_lock(
             timeout_secs=_MEDIUM_TIMEOUT,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     async def delete_request_lock(
         self,
@@ -695,7 +696,7 @@ async def _batch_add_requests_worker(
                     timeout_secs=_MEDIUM_TIMEOUT,
                 )
 
-                response_parsed = parse_date_fields(pluck_data(response.json()))
+                response_parsed = parse_date_fields(pluck_data(jsonlib.loads(response.text)))
                 processed_requests.extend(response_parsed.get('processedRequests', []))
                 unprocessed_requests.extend(response_parsed.get('unprocessedRequests', []))
 
@@ -805,7 +806,7 @@ async def batch_delete_requests(self, requests: list[dict]) -> dict:
             json=requests,
             timeout_secs=_SMALL_TIMEOUT,
         )
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     async def list_requests(
         self,
@@ -830,7 +831,7 @@ async def list_requests(
             timeout_secs=_MEDIUM_TIMEOUT,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     async def unlock_requests(self: RequestQueueClientAsync) -> dict:
         """Unlock all requests in the queue, which were locked by the same clientKey or from the same Actor run.
@@ -848,4 +849,4 @@ async def unlock_requests(self: RequestQueueClientAsync) -> dict:
             params=request_params,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
diff --git a/src/apify_client/clients/resource_clients/run.py b/src/apify_client/clients/resource_clients/run.py
index 2b51aaf7..90158763 100644
--- a/src/apify_client/clients/resource_clients/run.py
+++ b/src/apify_client/clients/resource_clients/run.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import json
+import json as jsonlib
 import logging
 import random
 import string
@@ -148,7 +149,7 @@ def metamorph(
             params=request_params,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     def resurrect(
         self,
@@ -195,7 +196,7 @@ def resurrect(
             params=request_params,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     def reboot(self) -> dict:
         """Reboot an Actor run. Only runs that are running, i.e. runs with status RUNNING can be rebooted.
@@ -209,7 +210,7 @@ def reboot(self) -> dict:
             url=self._url('reboot'),
             method='POST',
         )
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     def dataset(self) -> DatasetClient:
         """Get the client for the default dataset of the Actor run.
@@ -470,7 +471,7 @@ async def metamorph(
             params=request_params,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     async def resurrect(
         self,
@@ -517,7 +518,7 @@ async def resurrect(
             params=request_params,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     async def reboot(self) -> dict:
         """Reboot an Actor run. Only runs that are running, i.e. runs with status RUNNING can be rebooted.
@@ -531,7 +532,7 @@ async def reboot(self) -> dict:
             url=self._url('reboot'),
             method='POST',
         )
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     def dataset(self) -> DatasetClientAsync:
         """Get the client for the default dataset of the Actor run.
diff --git a/src/apify_client/clients/resource_clients/schedule.py b/src/apify_client/clients/resource_clients/schedule.py
index 315c5b83..360e819e 100644
--- a/src/apify_client/clients/resource_clients/schedule.py
+++ b/src/apify_client/clients/resource_clients/schedule.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import json as jsonlib
 from typing import Any
 
 from apify_shared.utils import filter_out_none_values_recursively, ignore_docs
@@ -115,7 +116,7 @@ def get_log(self) -> list | None:
                 method='GET',
                 params=self._params(),
             )
-            return pluck_data_as_list(response.json())
+            return pluck_data_as_list(jsonlib.loads(response.text))
         except ApifyApiError as exc:
             catch_not_found_or_throw(exc)
 
@@ -205,7 +206,7 @@ async def get_log(self) -> list | None:
                 method='GET',
                 params=self._params(),
             )
-            return pluck_data_as_list(response.json())
+            return pluck_data_as_list(jsonlib.loads(response.text))
         except ApifyApiError as exc:
             catch_not_found_or_throw(exc)
 
diff --git a/src/apify_client/clients/resource_clients/task.py b/src/apify_client/clients/resource_clients/task.py
index e791f46b..7276650e 100644
--- a/src/apify_client/clients/resource_clients/task.py
+++ b/src/apify_client/clients/resource_clients/task.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import json as jsonlib
 from typing import TYPE_CHECKING, Any, cast
 
 from apify_shared.utils import (
@@ -201,7 +202,7 @@ def start(
             params=request_params,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     def call(
         self,
@@ -264,7 +265,7 @@ def get_input(self) -> dict | None:
                 method='GET',
                 params=self._params(),
             )
-            return cast('dict', response.json())
+            return cast('dict', jsonlib.loads(response.text))
         except ApifyApiError as exc:
             catch_not_found_or_throw(exc)
         return None
@@ -283,7 +284,7 @@ def update_input(self, *, task_input: dict) -> dict:
             params=self._params(),
             json=task_input,
         )
-        return cast('dict', response.json())
+        return cast('dict', jsonlib.loads(response.text))
 
     def runs(self) -> RunCollectionClient:
         """Retrieve a client for the runs of this task."""
@@ -458,7 +459,7 @@ async def start(
             params=request_params,
         )
 
-        return parse_date_fields(pluck_data(response.json()))
+        return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
     async def call(
         self,
@@ -521,7 +522,7 @@ async def get_input(self) -> dict | None:
                 method='GET',
                 params=self._params(),
             )
-            return cast('dict', response.json())
+            return cast('dict', jsonlib.loads(response.text))
         except ApifyApiError as exc:
             catch_not_found_or_throw(exc)
         return None
@@ -540,7 +541,7 @@ async def update_input(self, *, task_input: dict) -> dict:
             params=self._params(),
             json=task_input,
         )
-        return cast('dict', response.json())
+        return cast('dict', jsonlib.loads(response.text))
 
     def runs(self) -> RunCollectionClientAsync:
         """Retrieve a client for the runs of this task."""
diff --git a/src/apify_client/clients/resource_clients/user.py b/src/apify_client/clients/resource_clients/user.py
index 71ab9998..87d7aeb2 100644
--- a/src/apify_client/clients/resource_clients/user.py
+++ b/src/apify_client/clients/resource_clients/user.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import json as jsonlib
 from typing import Any
 
 from apify_shared.utils import filter_out_none_values_recursively, ignore_docs, parse_date_fields
@@ -50,7 +51,7 @@ def monthly_usage(self) -> dict | None:
                 method='GET',
                 params=self._params(),
             )
-            return parse_date_fields(pluck_data(response.json()))
+            return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
         except ApifyApiError as exc:
             catch_not_found_or_throw(exc)
@@ -74,7 +75,7 @@ def limits(self) -> dict | None:
                 method='GET',
                 params=self._params(),
             )
-            return parse_date_fields(pluck_data(response.json()))
+            return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
         except ApifyApiError as exc:
             catch_not_found_or_throw(exc)
@@ -142,7 +143,7 @@ async def monthly_usage(self) -> dict | None:
                 method='GET',
                 params=self._params(),
             )
-            return parse_date_fields(pluck_data(response.json()))
+            return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
         except ApifyApiError as exc:
             catch_not_found_or_throw(exc)
@@ -166,7 +167,7 @@ async def limits(self) -> dict | None:
                 method='GET',
                 params=self._params(),
             )
-            return parse_date_fields(pluck_data(response.json()))
+            return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
         except ApifyApiError as exc:
             catch_not_found_or_throw(exc)
diff --git a/src/apify_client/clients/resource_clients/webhook.py b/src/apify_client/clients/resource_clients/webhook.py
index 87592a15..a74d0216 100644
--- a/src/apify_client/clients/resource_clients/webhook.py
+++ b/src/apify_client/clients/resource_clients/webhook.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import json as jsonlib
 from typing import TYPE_CHECKING, Any
 
 from apify_shared.utils import (
@@ -151,7 +152,7 @@ def test(self) -> dict | None:
                 params=self._params(),
             )
 
-            return parse_date_fields(pluck_data(response.json()))
+            return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
         except ApifyApiError as exc:
             catch_not_found_or_throw(exc)
@@ -262,7 +263,7 @@ async def test(self) -> dict | None:
                 params=self._params(),
             )
 
-            return parse_date_fields(pluck_data(response.json()))
+            return parse_date_fields(pluck_data(jsonlib.loads(response.text)))
 
         except ApifyApiError as exc:
             catch_not_found_or_throw(exc)
diff --git a/tests/integration/conftest.py b/tests/integration/conftest.py
index 5114a4b1..5768e87f 100644
--- a/tests/integration/conftest.py
+++ b/tests/integration/conftest.py
@@ -21,7 +21,7 @@ def apify_client() -> ApifyClient:
 
 # This fixture can't be session-scoped,
 # because then you start getting `RuntimeError: Event loop is closed` errors,
-# because `httpx.AsyncClient` in `ApifyClientAsync` tries to reuse the same event loop across requests,
+# because `impit.AsyncClient` in `ApifyClientAsync` tries to reuse the same event loop across requests,
 # but `pytest-asyncio` closes the event loop after each test,
 # and uses a new one for the next test.
 @pytest.fixture
diff --git a/tests/unit/test_client_timeouts.py b/tests/unit/test_client_timeouts.py
index 3259c977..70d09b90 100644
--- a/tests/unit/test_client_timeouts.py
+++ b/tests/unit/test_client_timeouts.py
@@ -1,13 +1,10 @@
 from __future__ import annotations
 
-import time
-from functools import partial
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Any
 from unittest.mock import Mock
 
 import pytest
-import respx
-from werkzeug import Response as WerkzeugResponse
+from impit import Response, TimeoutException
 
 from apify_client import ApifyClient
 from apify_client._http_client import HTTPClient, HTTPClientAsync
@@ -17,16 +14,33 @@
 from apify_client.clients.resource_clients import key_value_store as kvs
 
 if TYPE_CHECKING:
-    from httpx import Request, Response
+    from collections.abc import Iterator
+
     from pytest_httpserver import HTTPServer
-    from werkzeug import Request as WerkzeugRequest
 
 
 class EndOfTestError(Exception):
     """Custom exception that is raised after the relevant part of the code is executed to stop the test."""
 
 
-async def test_dynamic_timeout_async_client(httpserver: HTTPServer) -> None:
+@pytest.fixture
+def patch_request(monkeypatch: pytest.MonkeyPatch) -> Iterator[list]:
+    timeouts = []
+
+    def mock_request(*_args: Any, **kwargs: Any) -> None:
+        timeouts.append(kwargs.get('timeout'))
+        raise EndOfTestError
+
+    async def mock_request_async(*args: Any, **kwargs: Any) -> None:
+        return mock_request(*args, **kwargs)
+
+    monkeypatch.setattr('impit.Client.request', mock_request)
+    monkeypatch.setattr('impit.AsyncClient.request', mock_request_async)
+    yield timeouts
+    monkeypatch.undo()
+
+
+async def test_dynamic_timeout_async_client(monkeypatch: pytest.MonkeyPatch) -> None:
     """Tests timeout values for request with retriable errors.
 
     Values should increase with each attempt, starting from initial call value and bounded by the client timeout value.
@@ -34,36 +48,35 @@ async def test_dynamic_timeout_async_client(httpserver: HTTPServer) -> None:
     should_raise_error = iter((True, True, True, False))
     call_timeout = 1
     client_timeout = 5
-    expected_timeouts = iter((call_timeout, 2, 4, client_timeout))
+    expected_timeouts = [call_timeout, 2, 4, client_timeout]
     retry_counter_mock = Mock()
 
-    def slow_handler(_request: WerkzeugRequest) -> WerkzeugResponse:
-        timeout = next(expected_timeouts)
-        should_raise = next(should_raise_error)
-        # Counter for retries
-        retry_counter_mock()
+    timeouts = []
 
+    async def mock_request(*_args: Any, **kwargs: Any) -> Response:
+        timeouts.append(kwargs.get('timeout'))
+        retry_counter_mock()
+        should_raise = next(should_raise_error)
         if should_raise:
-            # We expect longer than the client is willing to wait. This will cause a timeout on the client side.
-            time.sleep(timeout + 0.02)
+            raise TimeoutException
 
-        return WerkzeugResponse('200 OK')
+        return Response(status_code=200)
 
-    httpserver.expect_request('/async_timeout', method='GET').respond_with_handler(slow_handler)
+    monkeypatch.setattr('impit.AsyncClient.request', mock_request)
 
-    server_url = str(httpserver.url_for('/async_timeout'))
     response = await HTTPClientAsync(timeout_secs=client_timeout).call(
-        method='GET', url=server_url, timeout_secs=call_timeout
+        method='GET', url='http://placeholder.url/async_timeout', timeout_secs=call_timeout
     )
 
     # Check that the retry counter was called the expected number of times
     # (4 times: 3 retries + 1 final successful call)
     assert retry_counter_mock.call_count == 4
+    assert timeouts == expected_timeouts
     # Check that the response is successful
     assert response.status_code == 200
 
 
-def test_dynamic_timeout_sync_client(httpserver: HTTPServer) -> None:
+def test_dynamic_timeout_sync_client(monkeypatch: pytest.MonkeyPatch) -> None:
     """Tests timeout values for request with retriable errors.
 
     Values should increase with each attempt, starting from initial call value and bounded by the client timeout value.
@@ -71,48 +84,34 @@ def test_dynamic_timeout_sync_client(httpserver: HTTPServer) -> None:
     should_raise_error = iter((True, True, True, False))
     call_timeout = 1
     client_timeout = 5
-    expected_timeouts = iter((call_timeout, 2, 4, client_timeout))
+    expected_timeouts = [call_timeout, 2, 4, client_timeout]
     retry_counter_mock = Mock()
 
-    def slow_handler(_request: WerkzeugRequest) -> WerkzeugResponse:
-        timeout = next(expected_timeouts)
-        should_raise = next(should_raise_error)
-        # Counter for retries
-        retry_counter_mock()
+    timeouts = []
 
+    def mock_request(*_args: Any, **kwargs: Any) -> Response:
+        timeouts.append(kwargs.get('timeout'))
+        retry_counter_mock()
+        should_raise = next(should_raise_error)
         if should_raise:
-            # We expect longer than the client is willing to wait. This will cause a timeout on the client side.
-            time.sleep(timeout + 0.02)
+            raise TimeoutException
 
-        return WerkzeugResponse('200 OK')
+        return Response(status_code=200)
 
-    httpserver.expect_request('/sync_timeout', method='GET').respond_with_handler(slow_handler)
+    monkeypatch.setattr('impit.Client.request', mock_request)
 
-    server_url = str(httpserver.url_for('/sync_timeout'))
-
-    response = HTTPClient(timeout_secs=client_timeout).call(method='GET', url=server_url, timeout_secs=call_timeout)
+    response = HTTPClient(timeout_secs=client_timeout).call(
+        method='GET', url='http://placeholder.url/sync_timeout', timeout_secs=call_timeout
+    )
 
     # Check that the retry counter was called the expected number of times
     # (4 times: 3 retries + 1 final successful call)
     assert retry_counter_mock.call_count == 4
+    assert timeouts == expected_timeouts
     # Check that the response is successful
     assert response.status_code == 200
 
 
-def assert_timeout(expected_timeout: int, request: Request) -> Response:
-    """Assert that correct timeouts are set on the request and raise `EndOfTestError`.
-
-    This is intended for tests that are only testing timeout value and further execution of the code is not desired.
-    """
-    assert request.extensions['timeout'] == {
-        'connect': expected_timeout,
-        'pool': expected_timeout,
-        'read': expected_timeout,
-        'write': expected_timeout,
-    }
-    raise EndOfTestError
-
-
 _timeout_params = [
     (DatasetClient, 'get', dataset._SMALL_TIMEOUT, {}),
     (DatasetClient, 'update', dataset._SMALL_TIMEOUT, {}),
@@ -153,18 +152,22 @@ def assert_timeout(expected_timeout: int, request: Request) -> Response:
     ('client_type', 'method', 'expected_timeout', 'kwargs'),
     _timeout_params,
 )
-@respx.mock
 def test_specific_timeouts_for_specific_endpoints_sync(
     client_type: type[DatasetClient | KeyValueStoreClient | RequestQueueClient],
     method: str,
     kwargs: dict,
     expected_timeout: int,
+    patch_request: list[float | None],
+    httpserver: HTTPServer,
 ) -> None:
-    respx.route(host='example.com').mock(side_effect=partial(assert_timeout, expected_timeout))
-    client = client_type(base_url='https://example.com', root_client=ApifyClient(), http_client=HTTPClient())
+    httpserver.expect_request('/').respond_with_data(status=200)
+    client = client_type(base_url=httpserver.url_for('/'), root_client=ApifyClient(), http_client=HTTPClient())
     with pytest.raises(EndOfTestError):
         getattr(client, method)(**kwargs)
 
+    assert len(patch_request) == 1
+    assert patch_request[0] == expected_timeout
+
 
 # This test will probably need to be reworked or skipped when switching to `impit`.
 # Without the mock library, it's difficult to reproduce, maybe with monkeypatch?
@@ -172,14 +175,18 @@ def test_specific_timeouts_for_specific_endpoints_sync(
     ('client_type', 'method', 'expected_timeout', 'kwargs'),
     _timeout_params,
 )
-@respx.mock
 async def test_specific_timeouts_for_specific_endpoints_async(
     client_type: type[DatasetClient | KeyValueStoreClient | RequestQueueClient],
     method: str,
     kwargs: dict,
     expected_timeout: int,
+    patch_request: list[float | None],
+    httpserver: HTTPServer,
 ) -> None:
-    respx.route(host='example.com').mock(side_effect=partial(assert_timeout, expected_timeout))
-    client = client_type(base_url='https://example.com', root_client=ApifyClient(), http_client=HTTPClient())
+    httpserver.expect_request('/').respond_with_data(status=200)
+    client = client_type(base_url=httpserver.url_for('/'), root_client=ApifyClient(), http_client=HTTPClient())
     with pytest.raises(EndOfTestError):
         await getattr(client, method)(**kwargs)
+
+    assert len(patch_request) == 1
+    assert patch_request[0] == expected_timeout
diff --git a/uv.lock b/uv.lock
index 4e297b08..3e15ac6e 100644
--- a/uv.lock
+++ b/uv.lock
@@ -6,29 +6,14 @@ resolution-markers = [
     "python_full_version < '3.10'",
 ]
 
-[[package]]
-name = "anyio"
-version = "4.9.0"
-source = { registry = "https://pypi.org/simple" }
-dependencies = [
-    { name = "exceptiongroup", marker = "python_full_version < '3.11'" },
-    { name = "idna" },
-    { name = "sniffio" },
-    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
-]
-sdist = { url = "https://files.pythonhosted.org/packages/95/7d/4c1bd541d4dffa1b52bd83fb8527089e097a106fc90b467a7313b105f840/anyio-4.9.0.tar.gz", hash = "sha256:673c0c244e15788651a4ff38710fea9675823028a6f08a5eda409e0c9840a028", size = 190949, upload-time = "2025-03-17T00:02:54.77Z" }
-wheels = [
-    { url = "https://files.pythonhosted.org/packages/a1/ee/48ca1a7c89ffec8b6a0c5d02b89c305671d5ffd8d3c94acf8b8c408575bb/anyio-4.9.0-py3-none-any.whl", hash = "sha256:9f76d541cad6e36af7beb62e978876f3b41e3e04f2c1fbf0884604c0a9c4d93c", size = 100916, upload-time = "2025-03-17T00:02:52.713Z" },
-]
-
 [[package]]
 name = "apify-client"
-version = "1.12.2"
+version = "1.12.3"
 source = { editable = "." }
 dependencies = [
     { name = "apify-shared" },
     { name = "colorama" },
-    { name = "httpx" },
+    { name = "impit" },
     { name = "more-itertools" },
 ]
 
@@ -46,7 +31,6 @@ dev = [
     { name = "pytest-timeout" },
     { name = "pytest-xdist" },
     { name = "redbaron" },
-    { name = "respx" },
     { name = "ruff" },
     { name = "setuptools" },
     { name = "types-colorama" },
@@ -57,7 +41,7 @@ dev = [
 requires-dist = [
     { name = "apify-shared", specifier = "<2.0.0" },
     { name = "colorama", specifier = ">=0.4.0" },
-    { name = "httpx", specifier = ">=0.25" },
+    { name = "impit", specifier = ">=0.5.2" },
     { name = "more-itertools", specifier = ">=10.0.0" },
 ]
 
@@ -75,7 +59,6 @@ dev = [
     { name = "pytest-timeout", specifier = ">=2.4.0" },
     { name = "pytest-xdist", specifier = "~=3.8.0" },
     { name = "redbaron", specifier = "~=0.9.0" },
-    { name = "respx", specifier = "~=0.22.0" },
     { name = "ruff", specifier = "~=0.12.0" },
     { name = "setuptools" },
     { name = "types-colorama", specifier = "~=0.4.15.20240106" },
@@ -516,43 +499,6 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/a7/55/588425bdbe8097b621db813e9b33f0a8a7257771683e0f5369c6c8eb66ab/griffe-1.11.0-py3-none-any.whl", hash = "sha256:dc56cc6af8d322807ecdb484b39838c7a51ca750cf21ccccf890500c4d6389d8", size = 137576, upload-time = "2025-08-07T18:23:34.859Z" },
 ]
 
-[[package]]
-name = "h11"
-version = "0.16.0"
-source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/01/ee/02a2c011bdab74c6fb3c75474d40b3052059d95df7e73351460c8588d963/h11-0.16.0.tar.gz", hash = "sha256:4e35b956cf45792e4caa5885e69fba00bdbc6ffafbfa020300e549b208ee5ff1", size = 101250, upload-time = "2025-04-24T03:35:25.427Z" }
-wheels = [
-    { url = "https://files.pythonhosted.org/packages/04/4b/29cac41a4d98d144bf5f6d33995617b185d14b22401f75ca86f384e87ff1/h11-0.16.0-py3-none-any.whl", hash = "sha256:63cf8bbe7522de3bf65932fda1d9c2772064ffb3dae62d55932da54b31cb6c86", size = 37515, upload-time = "2025-04-24T03:35:24.344Z" },
-]
-
-[[package]]
-name = "httpcore"
-version = "1.0.9"
-source = { registry = "https://pypi.org/simple" }
-dependencies = [
-    { name = "certifi" },
-    { name = "h11" },
-]
-sdist = { url = "https://files.pythonhosted.org/packages/06/94/82699a10bca87a5556c9c59b5963f2d039dbd239f25bc2a63907a05a14cb/httpcore-1.0.9.tar.gz", hash = "sha256:6e34463af53fd2ab5d807f399a9b45ea31c3dfa2276f15a2c3f00afff6e176e8", size = 85484, upload-time = "2025-04-24T22:06:22.219Z" }
-wheels = [
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-]
-
-[[package]]
-name = "httpx"
-version = "0.28.1"
-source = { registry = "https://pypi.org/simple" }
-dependencies = [
-    { name = "anyio" },
-    { name = "certifi" },
-    { name = "httpcore" },
-    { name = "idna" },
-]
-sdist = { url = "https://files.pythonhosted.org/packages/b1/df/48c586a5fe32a0f01324ee087459e112ebb7224f646c0b5023f5e79e9956/httpx-0.28.1.tar.gz", hash = "sha256:75e98c5f16b0f35b567856f597f06ff2270a374470a5c2392242528e3e3e42fc", size = 141406, upload-time = "2024-12-06T15:37:23.222Z" }
-wheels = [
-    { url = "https://files.pythonhosted.org/packages/2a/39/e50c7c3a983047577ee07d2a9e53faf5a69493943ec3f6a384bdc792deb2/httpx-0.28.1-py3-none-any.whl", hash = "sha256:d909fcccc110f8c7faf814ca82a9a4d816bc5a6dbfea25d6591d6985b8ba59ad", size = 73517, upload-time = "2024-12-06T15:37:21.509Z" },
-]
-
 [[package]]
 name = "identify"
 version = "2.6.12"
@@ -571,6 +517,55 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/76/c6/c88e154df9c4e1a2a66ccf0005a88dfb2650c1dffb6f5ce603dfbd452ce3/idna-3.10-py3-none-any.whl", hash = "sha256:946d195a0d259cbba61165e88e65941f16e9b36ea6ddb97f00452bae8b1287d3", size = 70442, upload-time = "2024-09-15T18:07:37.964Z" },
 ]
 
+[[package]]
+name = "impit"
+version = "0.5.2"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/0b/b9/713caad9ebb3fe3d016b6715a8f2fa8dad070159907b36bb743ea6a13919/impit-0.5.2.tar.gz", hash = "sha256:027641ca72c807372101ae4c3533fc2c3c837413ead4b7461a044ec5b52f3b8e", size = 89508, upload-time = "2025-08-11T15:51:00.009Z" }
+wheels = [
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+    { url = "https://files.pythonhosted.org/packages/f3/00/22030ddbc0af4fc5c09049567922288dac7b72d07853b0a8637e090fc97a/impit-0.5.2-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:f970b8f0d5f6ab06bbc7b2cb19f027d8126e9123d9fd566de552e6ad7e015738", size = 3670030, upload-time = "2025-08-11T15:49:55.175Z" },
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diff --git a/website/sidebars.js b/website/sidebars.js
index e45f2828..448eac9c 100644
--- a/website/sidebars.js
+++ b/website/sidebars.js
@@ -33,17 +33,17 @@ module.exports = {
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-        //     label: 'Upgrading',
-        //     collapsed: false,
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-        //         {
-        //             type: 'autogenerated',
-        //             dirName: '04_upgrading',
-        //         },
-        //     ],
-        // },
+        {
+            type: 'category',
+            label: 'Upgrading',
+            collapsed: false,
+            items: [
+                {
+                    type: 'autogenerated',
+                    dirName: '04_upgrading',
+                },
+            ],
+        },
         {
             type: 'doc',
             id: 'changelog',