diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index d38a5315e..718191e71 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -27,14 +27,11 @@ repos:
   rev: 25.1.0
   hooks:
     - id: black
-- repo: https://github.com/PyCQA/flake8
-  rev: 7.2.0
+- repo: https://github.com/astral-sh/ruff-pre-commit
+  rev: v0.5.5
   hooks:
-    - id: flake8
-      additional_dependencies:
-        - 'flake8-bugbear==24.4.26'
-        - 'flake8-typing-as-t==0.0.3'
-        - 'flake8-comprehensions==3.15.0'
+    - id: ruff
+      args: ["--fix"]
 - repo: https://github.com/sirosen/slyp
   rev: 0.8.2
   hooks:
diff --git a/pyproject.toml b/pyproject.toml
index deb45caa5..1f9925db0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -60,6 +60,13 @@ namespaces = false
 [tool.isort]
 profile = "black"
 
+[tool.ruff]
+select = [
+    "B",   # flake8-bugbear
+    "C4",  # flake8-comprehensions
+    "TYP", # flake8-typing-as-t
+]
+
 [tool.mypy]
 # strict = true  # TODO: enable
 disallow_untyped_defs = true
diff --git a/src/check_jsonschema/builtin_schemas/__init__.py b/src/check_jsonschema/builtin_schemas/__init__.py
index e9a89e02b..780268951 100644
--- a/src/check_jsonschema/builtin_schemas/__init__.py
+++ b/src/check_jsonschema/builtin_schemas/__init__.py
@@ -17,8 +17,8 @@ def _get(package: str, resource: str, name: str) -> dict[str, t.Any]:
                 importlib.resources.files(package).joinpath(resource).read_bytes()
             ),
         )
-    except (FileNotFoundError, ModuleNotFoundError):
-        raise NoSuchSchemaError(f"no builtin schema named {name} was found")
+    except (FileNotFoundError, ModuleNotFoundError) as err:
+        raise NoSuchSchemaError(f"no builtin schema named {name} was found") from err
 
 
 def _get_vendored_schema(name: str) -> dict[str, t.Any]:
diff --git a/src/check_jsonschema/checker.py b/src/check_jsonschema/checker.py
index c6cd852eb..974fe69e3 100644
--- a/src/check_jsonschema/checker.py
+++ b/src/check_jsonschema/checker.py
@@ -1,6 +1,5 @@
 from __future__ import annotations
 
-import pathlib
 import typing as t
 
 import click
@@ -8,11 +7,7 @@
 import referencing.exceptions
 
 from . import utils
-from .formats import FormatOptions
-from .instance_loader import InstanceLoader
 from .parsers import ParseError
-from .regex_variants import RegexImplementation
-from .reporter import Reporter
 from .result import CheckResult
 from .schema_loader import SchemaLoaderBase, SchemaParseError, UnsupportedUrlScheme
 
@@ -22,6 +17,15 @@ def __init__(self, code: int) -> None:
         self.code = code
 
 
+if t.TYPE_CHECKING:
+    import pathlib
+
+    from .formats import FormatOptions
+    from .instance_loader import InstanceLoader
+    from .regex_variants import RegexImplementation
+    from .reporter import Reporter
+
+
 class SchemaChecker:
     def __init__(
         self,
diff --git a/src/check_jsonschema/cli/main_command.py b/src/check_jsonschema/cli/main_command.py
index 9e93ff1ff..8ba530e8f 100644
--- a/src/check_jsonschema/cli/main_command.py
+++ b/src/check_jsonschema/cli/main_command.py
@@ -5,7 +5,7 @@
 import typing as t
 
 import click
-import jsonschema
+import jsonschema  # noqa: TCH002
 
 from ..catalog import CUSTOM_SCHEMA_NAMES, SCHEMA_CATALOG
 from ..checker import SchemaChecker
diff --git a/src/check_jsonschema/cli/parse_result.py b/src/check_jsonschema/cli/parse_result.py
index bfd9065b1..4d12eec1c 100644
--- a/src/check_jsonschema/cli/parse_result.py
+++ b/src/check_jsonschema/cli/parse_result.py
@@ -4,11 +4,14 @@
 import typing as t
 
 import click
-import jsonschema
 
 from ..formats import FormatOptions
 from ..regex_variants import RegexImplementation, RegexVariantName
-from ..transforms import Transform
+
+if t.TYPE_CHECKING:
+    import jsonschema
+
+    from ..transforms import Transform
 
 
 class SchemaLoadingMode(enum.Enum):
diff --git a/src/check_jsonschema/cli/warnings.py b/src/check_jsonschema/cli/warnings.py
index 8ad61526f..57e9ca28a 100644
--- a/src/check_jsonschema/cli/warnings.py
+++ b/src/check_jsonschema/cli/warnings.py
@@ -3,7 +3,8 @@
 import typing as t
 import warnings
 
-import click
+if t.TYPE_CHECKING:
+    import click
 
 
 def deprecation_warning_callback(
diff --git a/src/check_jsonschema/formats/__init__.py b/src/check_jsonschema/formats/__init__.py
index 2308c4313..8556def62 100644
--- a/src/check_jsonschema/formats/__init__.py
+++ b/src/check_jsonschema/formats/__init__.py
@@ -1,13 +1,16 @@
 from __future__ import annotations
 
 import copy
+import typing
 
 import jsonschema
 import jsonschema.validators
 
-from ..regex_variants import RegexImplementation
 from .implementations import validate_rfc3339, validate_time
 
+if typing.TYPE_CHECKING:
+    from ..regex_variants import RegexImplementation
+
 # all known format strings except for a selection from draft3 which have either
 # been renamed or removed:
 # - color
diff --git a/src/check_jsonschema/identify_filetype.py b/src/check_jsonschema/identify_filetype.py
index b2b9dc390..99d574934 100644
--- a/src/check_jsonschema/identify_filetype.py
+++ b/src/check_jsonschema/identify_filetype.py
@@ -4,7 +4,10 @@
 
 from __future__ import annotations
 
-import pathlib
+import typing
+
+if typing.TYPE_CHECKING:
+    import pathlib
 
 _EXTENSION_MAP = {
     "json": "json",
diff --git a/src/check_jsonschema/parsers/__init__.py b/src/check_jsonschema/parsers/__init__.py
index 6db5e95bf..e570a9074 100644
--- a/src/check_jsonschema/parsers/__init__.py
+++ b/src/check_jsonschema/parsers/__init__.py
@@ -1,14 +1,16 @@
 from __future__ import annotations
 
 import io
-import pathlib
 import typing as t
 
-import ruamel.yaml
-
 from ..identify_filetype import path_to_type
 from . import json5, json_, toml, yaml
 
+if t.TYPE_CHECKING:
+    import pathlib
+
+    import ruamel.yaml
+
 _PARSER_ERRORS: set[type[Exception]] = {
     json_.JSONDecodeError,
     yaml.ParseError,
diff --git a/src/check_jsonschema/reporter.py b/src/check_jsonschema/reporter.py
index 48663002c..27d12dcd6 100644
--- a/src/check_jsonschema/reporter.py
+++ b/src/check_jsonschema/reporter.py
@@ -13,10 +13,12 @@
 import click
 import jsonschema
 
-from .parsers import ParseError
-from .result import CheckResult
 from .utils import format_error, iter_validation_error
 
+if t.TYPE_CHECKING:
+    from .parsers import ParseError
+    from .result import CheckResult
+
 
 class Reporter(abc.ABC):
     def __init__(self, *, verbosity: int, **kwargs: t.Any) -> None:
diff --git a/src/check_jsonschema/result.py b/src/check_jsonschema/result.py
index 00e4301e3..1ad6e129c 100644
--- a/src/check_jsonschema/result.py
+++ b/src/check_jsonschema/result.py
@@ -1,10 +1,13 @@
 from __future__ import annotations
 
-import pathlib
+import typing
 
-import jsonschema
+if typing.TYPE_CHECKING:
+    import pathlib
 
-from .parsers import ParseError
+    import jsonschema
+
+    from .parsers import ParseError
 
 
 class CheckResult:
diff --git a/src/check_jsonschema/schema_loader/main.py b/src/check_jsonschema/schema_loader/main.py
index e056389a9..b817b8eb0 100644
--- a/src/check_jsonschema/schema_loader/main.py
+++ b/src/check_jsonschema/schema_loader/main.py
@@ -1,7 +1,6 @@
 from __future__ import annotations
 
 import functools
-import pathlib
 import typing as t
 import urllib.error
 import urllib.parse
@@ -11,12 +10,16 @@
 from ..builtin_schemas import get_builtin_schema
 from ..formats import FormatOptions, format_checker_for_regex_impl, make_format_checker
 from ..parsers import ParserSet
-from ..regex_variants import RegexImplementation
 from ..utils import is_url_ish
 from .errors import UnsupportedUrlScheme
 from .readers import HttpSchemaReader, LocalSchemaReader, StdinSchemaReader
 from .resolver import make_reference_registry
 
+if t.TYPE_CHECKING:
+    import pathlib
+
+    from ..regex_variants import RegexImplementation
+
 
 def _extend_with_default(
     validator_class: type[jsonschema.protocols.Validator],
@@ -144,7 +147,7 @@ def get_validator(
     ) -> jsonschema.protocols.Validator:
         return self._get_validator(format_opts, regex_impl, fill_defaults)
 
-    @functools.lru_cache
+    @functools.lru_cache  # noqa: B019
     def _get_validator(
         self,
         format_opts: FormatOptions,
diff --git a/src/check_jsonschema/schema_loader/resolver.py b/src/check_jsonschema/schema_loader/resolver.py
index 15344d6bd..91011fc80 100644
--- a/src/check_jsonschema/schema_loader/resolver.py
+++ b/src/check_jsonschema/schema_loader/resolver.py
@@ -7,9 +7,11 @@
 from referencing.jsonschema import DRAFT202012, Schema
 
 from ..cachedownloader import CacheDownloader
-from ..parsers import ParserSet
 from ..utils import filename2path
 
+if t.TYPE_CHECKING:
+    from ..parsers import ParserSet
+
 
 def make_reference_registry(
     parsers: ParserSet, retrieval_uri: str | None, schema: dict, disable_cache: bool
diff --git a/src/check_jsonschema/transforms/__init__.py b/src/check_jsonschema/transforms/__init__.py
index b294e6005..8ab6fd5d8 100644
--- a/src/check_jsonschema/transforms/__init__.py
+++ b/src/check_jsonschema/transforms/__init__.py
@@ -1,7 +1,9 @@
 from __future__ import annotations
 
+import typing
+
 from .azure_pipelines import AZURE_TRANSFORM
-from .base import Transform
+from .base import Transform  # noqa: TCH001
 from .gitlab import GITLAB_TRANSFORM
 
 TRANSFORM_LIBRARY: dict[str, Transform] = {
diff --git a/src/check_jsonschema/transforms/base.py b/src/check_jsonschema/transforms/base.py
index 0ed9a8647..a05c3134a 100644
--- a/src/check_jsonschema/transforms/base.py
+++ b/src/check_jsonschema/transforms/base.py
@@ -2,7 +2,8 @@
 
 import typing as t
 
-import ruamel.yaml
+if t.TYPE_CHECKING:
+    import ruamel.yaml
 
 
 class Transform:
diff --git a/src/check_jsonschema/transforms/gitlab.py b/src/check_jsonschema/transforms/gitlab.py
index bb75ee92e..7fa3731f0 100644
--- a/src/check_jsonschema/transforms/gitlab.py
+++ b/src/check_jsonschema/transforms/gitlab.py
@@ -2,10 +2,11 @@
 
 import typing as t
 
-import ruamel.yaml
-
 from .base import Transform
 
+if t.TYPE_CHECKING:
+    import ruamel.yaml
+
 
 class GitLabReferenceExpectationViolation(ValueError):
     def __init__(self, msg: str, data: t.Any) -> None:
diff --git a/src/check_jsonschema/utils.py b/src/check_jsonschema/utils.py
index e6e36f282..566559517 100644
--- a/src/check_jsonschema/utils.py
+++ b/src/check_jsonschema/utils.py
@@ -11,7 +11,9 @@
 import urllib.request
 
 import click
-import jsonschema
+
+if t.TYPE_CHECKING:
+    import jsonschema
 
 WINDOWS = os.name == "nt"