diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6289dbcd0..282823b22 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -76,6 +76,48 @@ jobs:
       - run: poe lint
       - run: poe build-develop
       - run: mkdir junit-xml
+      - run: poe test ${{matrix.pytestExtraArgs}} -k "test_custom_slot_supplier" -sv --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}.xml
+        timeout-minutes: 5
+      - run: poe test ${{matrix.pytestExtraArgs}} -k "test_custom_slot_supplier" -sv --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}.xml
+        timeout-minutes: 5
+      - run: poe test ${{matrix.pytestExtraArgs}} -k "test_custom_slot_supplier" -sv --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}.xml
+        timeout-minutes: 5
+      - run: poe test ${{matrix.pytestExtraArgs}} -k "test_custom_slot_supplier" -sv --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}.xml
+        timeout-minutes: 5
+      - run: poe test ${{matrix.pytestExtraArgs}} -k "test_custom_slot_supplier" -sv --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}.xml
+        timeout-minutes: 5
+      - run: poe test ${{matrix.pytestExtraArgs}} -k "test_custom_slot_supplier" -sv --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}.xml
+        timeout-minutes: 5
+      - run: poe test ${{matrix.pytestExtraArgs}} -k "test_custom_slot_supplier" -sv --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}.xml
+        timeout-minutes: 5
+      - run: poe test ${{matrix.pytestExtraArgs}} -k "test_custom_slot_supplier" -sv --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}.xml
+        timeout-minutes: 5
+      - run: poe test ${{matrix.pytestExtraArgs}} -k "test_custom_slot_supplier" -sv --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}.xml
+        timeout-minutes: 5
+      - run: poe test ${{matrix.pytestExtraArgs}} -k "test_custom_slot_supplier" -sv --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}.xml
+        timeout-minutes: 5
+      - run: poe test ${{matrix.pytestExtraArgs}} -k "test_custom_slot_supplier" -sv --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}.xml
+        timeout-minutes: 5
+      - run: poe test ${{matrix.pytestExtraArgs}} -k "test_custom_slot_supplier" -sv --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}.xml
+        timeout-minutes: 5
+      - run: poe test ${{matrix.pytestExtraArgs}} -k "test_custom_slot_supplier" -sv --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}.xml
+        timeout-minutes: 5
+      - run: poe test ${{matrix.pytestExtraArgs}} -k "test_custom_slot_supplier" -sv --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}.xml
+        timeout-minutes: 5
+      - run: poe test ${{matrix.pytestExtraArgs}} -k "test_custom_slot_supplier" -sv --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}.xml
+        timeout-minutes: 5
+      - run: poe test ${{matrix.pytestExtraArgs}} -k "test_custom_slot_supplier" -sv --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}.xml
+        timeout-minutes: 5
+      - run: poe test ${{matrix.pytestExtraArgs}} -k "test_custom_slot_supplier" -sv --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}.xml
+        timeout-minutes: 5
+      - run: poe test ${{matrix.pytestExtraArgs}} -k "test_custom_slot_supplier" -sv --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}.xml
+        timeout-minutes: 5
+      - run: poe test ${{matrix.pytestExtraArgs}} -k "test_custom_slot_supplier" -sv --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}.xml
+        timeout-minutes: 5
+      - run: poe test ${{matrix.pytestExtraArgs}} -k "test_custom_slot_supplier" -sv --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}.xml
+        timeout-minutes: 5
+      - run: poe test ${{matrix.pytestExtraArgs}} -k "test_custom_slot_supplier" -sv --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}.xml
+        timeout-minutes: 5
       - run: poe test ${{matrix.pytestExtraArgs}} -s --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}.xml
         timeout-minutes: 15
       # Time skipping doesn't yet support ARM
diff --git a/temporalio/bridge/Cargo.lock b/temporalio/bridge/Cargo.lock
index 740f9a547..bf65c5e54 100644
--- a/temporalio/bridge/Cargo.lock
+++ b/temporalio/bridge/Cargo.lock
@@ -2075,6 +2075,7 @@ checksum = "357703d41365b4b27c590e3ed91eabb1b663f07c4c084095e60cbed4362dff0d"
 [[package]]
 name = "rustfsm"
 version = "0.1.0"
+source = "git+https://github.com/temporalio/sdk-core?branch=debug_slot_supplier#5b415d997dd5c6cef40f6dd319eda768c2f80ad5"
 dependencies = [
  "rustfsm_procmacro",
  "rustfsm_trait",
@@ -2083,6 +2084,7 @@ dependencies = [
 [[package]]
 name = "rustfsm_procmacro"
 version = "0.1.0"
+source = "git+https://github.com/temporalio/sdk-core?branch=debug_slot_supplier#5b415d997dd5c6cef40f6dd319eda768c2f80ad5"
 dependencies = [
  "derive_more",
  "proc-macro2",
@@ -2094,6 +2096,7 @@ dependencies = [
 [[package]]
 name = "rustfsm_trait"
 version = "0.1.0"
+source = "git+https://github.com/temporalio/sdk-core?branch=debug_slot_supplier#5b415d997dd5c6cef40f6dd319eda768c2f80ad5"
 
 [[package]]
 name = "rustix"
@@ -2441,6 +2444,7 @@ dependencies = [
 [[package]]
 name = "temporal-client"
 version = "0.1.0"
+source = "git+https://github.com/temporalio/sdk-core?branch=debug_slot_supplier#5b415d997dd5c6cef40f6dd319eda768c2f80ad5"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -2493,6 +2497,7 @@ dependencies = [
 [[package]]
 name = "temporal-sdk-core"
 version = "0.1.0"
+source = "git+https://github.com/temporalio/sdk-core?branch=debug_slot_supplier#5b415d997dd5c6cef40f6dd319eda768c2f80ad5"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -2552,6 +2557,7 @@ dependencies = [
 [[package]]
 name = "temporal-sdk-core-api"
 version = "0.1.0"
+source = "git+https://github.com/temporalio/sdk-core?branch=debug_slot_supplier#5b415d997dd5c6cef40f6dd319eda768c2f80ad5"
 dependencies = [
  "async-trait",
  "derive_builder",
@@ -2573,6 +2579,7 @@ dependencies = [
 [[package]]
 name = "temporal-sdk-core-protos"
 version = "0.1.0"
+source = "git+https://github.com/temporalio/sdk-core?branch=debug_slot_supplier#5b415d997dd5c6cef40f6dd319eda768c2f80ad5"
 dependencies = [
  "anyhow",
  "base64",
diff --git a/temporalio/bridge/Cargo.toml b/temporalio/bridge/Cargo.toml
index 70a3c5820..aa946f051 100644
--- a/temporalio/bridge/Cargo.toml
+++ b/temporalio/bridge/Cargo.toml
@@ -27,14 +27,14 @@ pyo3 = { version = "0.25", features = [
 ] }
 pyo3-async-runtimes = { version = "0.25", features = ["tokio-runtime"] }
 pythonize = "0.25"
-temporal-client = { version = "0.1.0", path = "./sdk-core/client" }
-temporal-sdk-core = { version = "0.1.0", path = "./sdk-core/core", features = [
+temporal-client = { git = "https://github.com/temporalio/sdk-core", branch = "debug_slot_supplier" }
+temporal-sdk-core = { git = "https://github.com/temporalio/sdk-core", branch = "debug_slot_supplier", features = [
     "ephemeral-server",
 ] }
-temporal-sdk-core-api = { version = "0.1.0", path = "./sdk-core/core-api", features = [
+temporal-sdk-core-api = { git = "https://github.com/temporalio/sdk-core", branch = "debug_slot_supplier",  features = [
     "envconfig",
 ] }
-temporal-sdk-core-protos = { version = "0.1.0", path = "./sdk-core/sdk-core-protos" }
+temporal-sdk-core-protos = { git = "https://github.com/temporalio/sdk-core", branch = "debug_slot_supplier" }
 tokio = "1.26"
 tokio-stream = "0.1"
 tonic = "0.13"
diff --git a/temporalio/bridge/sdk-core b/temporalio/bridge/sdk-core
index 4078190b9..682d441dd 160000
--- a/temporalio/bridge/sdk-core
+++ b/temporalio/bridge/sdk-core
@@ -1 +1 @@
-Subproject commit 4078190b99ef16691512bc58e1da2d109419bc93
+Subproject commit 682d441dd3b830e1477af3edb7c2330b403c4c33
diff --git a/temporalio/runtime.py b/temporalio/runtime.py
index 84b683941..6e343c227 100644
--- a/temporalio/runtime.py
+++ b/temporalio/runtime.py
@@ -142,7 +142,7 @@ def _to_bridge_config(self) -> temporalio.bridge.runtime.LoggingConfig:
 
 
 LoggingConfig.default = LoggingConfig(
-    filter=TelemetryFilter(core_level="WARN", other_level="ERROR")
+    filter=TelemetryFilter(core_level="DEBUG", other_level="ERROR")
 )
 
 _module_start_time = time.time()
diff --git a/tests/worker/test_worker.py b/tests/worker/test_worker.py
index e19325835..345b1a980 100644
--- a/tests/worker/test_worker.py
+++ b/tests/worker/test_worker.py
@@ -2,6 +2,7 @@
 
 import asyncio
 import concurrent.futures
+import logging
 import uuid
 from datetime import timedelta
 from typing import Any, Awaitable, Callable, Optional, Sequence
@@ -64,6 +65,8 @@
 with workflow.unsafe.imports_passed_through():
     import pytest
 
+logger = logging.getLogger(__name__)
+
 
 def test_load_default_worker_binary_id():
     # Just run it twice and confirm it didn't change
@@ -469,6 +472,12 @@ async def reserve_slot(self, ctx: SlotReserveContext) -> SlotPermit:
             # Verify an async call doesn't bungle things
             await asyncio.sleep(0.01)
             self.reserves += 1
+            logger.info(
+                "Reserve slot %d - %s - %s",
+                self.reserves,
+                ctx.slot_type,
+                ctx.task_queue,
+            )
             return MyPermit(self.reserves)
 
         def try_reserve_slot(self, ctx: SlotReserveContext) -> Optional[SlotPermit]:
@@ -494,6 +503,12 @@ def release_slot(self, ctx: SlotReleaseContext) -> None:
             assert ctx.permit is not None
             assert isinstance(ctx.permit, MyPermit)
             assert ctx.permit.pnum is not None
+
+            logger.info(
+                "Release slot %d, %d",
+                ctx.permit.pnum,
+                self.highest_seen_reserve_on_release,
+            )
             self.highest_seen_reserve_on_release = max(
                 ctx.permit.pnum, self.highest_seen_reserve_on_release
             )