diff --git a/Makefile b/Makefile
index e5af680..824ab36 100644
--- a/Makefile
+++ b/Makefile
@@ -23,7 +23,7 @@ lint:
 # Run type checker
 type-check:
 	@echo "Running mypy type checker..."
-	uv tool run mypy cadence/
+	uv run mypy cadence/ tests/
 
 # Run unit tests
 test:
diff --git a/cadence/data_converter.py b/cadence/data_converter.py
index cae382d..83c0948 100644
--- a/cadence/data_converter.py
+++ b/cadence/data_converter.py
@@ -1,5 +1,5 @@
 from abc import abstractmethod
-from typing import Protocol, List, Type, Any
+from typing import Protocol, List, Type, Any, Sequence
 
 from cadence.api.v1.common_pb2 import Payload
 from json import JSONDecoder
@@ -24,7 +24,9 @@ def __init__(self) -> None:
         # Need to use std lib decoder in order to decode the custom whitespace delimited data format
         self._decoder = JSONDecoder(strict=False)
 
-    def from_data(self, payload: Payload, type_hints: List[Type | None]) -> List[Any]:
+    def from_data(
+        self, payload: Payload, type_hints: Sequence[Type | None]
+    ) -> List[Any]:
         if not payload.data:
             return DefaultDataConverter._convert_into([], type_hints)
 
@@ -33,7 +35,7 @@ def from_data(self, payload: Payload, type_hints: List[Type | None]) -> List[Any
         return self._decode_whitespace_delimited(payload_str, type_hints)
 
     def _decode_whitespace_delimited(
-        self, payload: str, type_hints: List[Type | None]
+        self, payload: str, type_hints: Sequence[Type | None]
     ) -> List[Any]:
         results: List[Any] = []
         start, end = 0, len(payload)
@@ -46,7 +48,9 @@ def _decode_whitespace_delimited(
         return DefaultDataConverter._convert_into(results, type_hints)
 
     @staticmethod
-    def _convert_into(values: List[Any], type_hints: List[Type | None]) -> List[Any]:
+    def _convert_into(
+        values: List[Any], type_hints: Sequence[Type | None]
+    ) -> List[Any]:
         results: List[Any] = []
         for i, type_hint in enumerate(type_hints):
             if not type_hint:
diff --git a/pyproject.toml b/pyproject.toml
index 75d7764..fa42b44 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -80,7 +80,7 @@ check_untyped_defs = true
 disallow_untyped_decorators = false  # Temporarily disable to allow CI to pass
 no_implicit_optional = true
 warn_redundant_casts = true
-warn_unused_ignores = true
+warn_unused_ignores = false
 warn_no_return = true
 warn_unreachable = true
 strict_equality = true
diff --git a/tests/cadence/_internal/rpc/test_error.py b/tests/cadence/_internal/rpc/test_error.py
index d3c30b9..c4a2fcd 100644
--- a/tests/cadence/_internal/rpc/test_error.py
+++ b/tests/cadence/_internal/rpc/test_error.py
@@ -2,10 +2,10 @@
 
 import pytest
 from google.protobuf import any_pb2
-from google.rpc import code_pb2, status_pb2
+from google.rpc import code_pb2, status_pb2  # type: ignore
 from grpc import Status, StatusCode, server
 from grpc.aio import insecure_channel
-from grpc_status.rpc_status import to_status
+from grpc_status.rpc_status import to_status  # type: ignore
 
 from cadence._internal.rpc.error import CadenceErrorInterceptor
 from cadence.api.v1 import error_pb2, service_meta_pb2_grpc
@@ -168,7 +168,7 @@ def fake_service():
 )
 @pytest.mark.asyncio
 async def test_map_error(
-    fake_service, err: Message | Status, expected: CadenceRpcError
+    fake_service, err: Message | Status, expected: CadenceRpcError | None
 ):
     async with insecure_channel(
         f"[::]:{fake_service.port}", interceptors=[CadenceErrorInterceptor()]
diff --git a/tests/cadence/_internal/rpc/test_retry.py b/tests/cadence/_internal/rpc/test_retry.py
index 64249fd..9962c64 100644
--- a/tests/cadence/_internal/rpc/test_retry.py
+++ b/tests/cadence/_internal/rpc/test_retry.py
@@ -3,10 +3,10 @@
 
 import pytest
 from google.protobuf import any_pb2
-from google.rpc import status_pb2, code_pb2
+from google.rpc import status_pb2, code_pb2  # type: ignore
 from grpc import server
 from grpc.aio import insecure_channel
-from grpc_status.rpc_status import to_status
+from grpc_status.rpc_status import to_status  # type: ignore
 
 from cadence._internal.rpc.error import CadenceErrorInterceptor
 from cadence.api.v1 import error_pb2, service_workflow_pb2_grpc
diff --git a/tests/cadence/_internal/workflow/test_deterministic_event_loop.py b/tests/cadence/_internal/workflow/test_deterministic_event_loop.py
index bbca5b0..5d611ab 100644
--- a/tests/cadence/_internal/workflow/test_deterministic_event_loop.py
+++ b/tests/cadence/_internal/workflow/test_deterministic_event_loop.py
@@ -3,12 +3,12 @@
 from cadence._internal.workflow.deterministic_event_loop import DeterministicEventLoop
 
 
-async def coro_append(results: list, i: int):
+async def coro_append(results: list[int], i: int):
     results.append(i)
 
 
 async def coro_await(size: int):
-    results = []
+    results: list[int] = []
     for i in range(size):
         await coro_append(results, i)
     return results
@@ -19,7 +19,7 @@ async def coro_await_future(future: asyncio.Future):
 
 
 async def coro_await_task(size: int):
-    results = []
+    results: list[int] = []
     for i in range(size):
         asyncio.create_task(coro_append(results, i))
     return results
@@ -40,11 +40,15 @@ def teardown_method(self):
 
     def test_call_soon(self):
         """Test _run_once executes single callback."""
-        results = []
-        expected = []
+        results: list[int] = []
+        expected: list[int] = []
         for i in range(10000):
             expected.append(i)
-            self.loop.call_soon(lambda x=i: results.append(x))
+
+            def add_to_result(result: int):
+                results.append(result)
+
+            self.loop.call_soon(add_to_result, i)
 
         self.loop._run_once()
 
diff --git a/tests/cadence/common_activities.py b/tests/cadence/common_activities.py
index b6904b4..1b7daaf 100644
--- a/tests/cadence/common_activities.py
+++ b/tests/cadence/common_activities.py
@@ -1,3 +1,4 @@
+from typing import Protocol
 from dataclasses import dataclass
 
 from cadence import activity
@@ -43,7 +44,7 @@ async def echo_async(self, incoming: str) -> str:
         return incoming
 
 
-class ActivityInterface:
+class ActivityInterface(Protocol):
     @activity.defn()
     def do_something(self) -> str: ...
 
@@ -52,7 +53,7 @@ def do_something(self) -> str: ...
 class ActivityImpl(ActivityInterface):
     result: str
 
-    def do_something(self) -> str:
+    def do_something(self) -> str:  # type: ignore
         return self.result
 
 
diff --git a/tests/cadence/test_client_workflow.py b/tests/cadence/test_client_workflow.py
index acb1a98..3a6e7f1 100644
--- a/tests/cadence/test_client_workflow.py
+++ b/tests/cadence/test_client_workflow.py
@@ -267,7 +267,7 @@ def mock_build_request(workflow, args, options):
             request.domain = "test-domain"
             return request
 
-        client._build_start_workflow_request = Mock(side_effect=mock_build_request)
+        client._build_start_workflow_request = Mock(side_effect=mock_build_request)  # type: ignore
 
         execution = await client.start_workflow(
             "TestWorkflow",
@@ -298,7 +298,7 @@ async def test_start_workflow_grpc_error(self, mock_client):
         client._workflow_stub = mock_client.workflow_stub
 
         # Mock the internal method
-        client._build_start_workflow_request = Mock(
+        client._build_start_workflow_request = Mock(  # type: ignore
             return_value=StartWorkflowExecutionRequest()
         )
 
@@ -324,7 +324,7 @@ async def test_start_workflow_with_kwargs(self, mock_client):
         client._workflow_stub = mock_client.workflow_stub
 
         # Mock the internal method to capture options
-        captured_options = None
+        captured_options: StartWorkflowOptions = StartWorkflowOptions()
 
         def mock_build_request(workflow, args, options):
             nonlocal captured_options
@@ -333,7 +333,7 @@ def mock_build_request(workflow, args, options):
             request.workflow_id = "test-workflow-id"
             return request
 
-        client._build_start_workflow_request = Mock(side_effect=mock_build_request)
+        client._build_start_workflow_request = Mock(side_effect=mock_build_request)  # type: ignore
 
         await client.start_workflow(
             "TestWorkflow",
@@ -365,7 +365,7 @@ async def test_start_workflow_with_default_task_timeout(self, mock_client):
         client._workflow_stub = mock_client.workflow_stub
 
         # Mock the internal method to capture options
-        captured_options = None
+        captured_options: StartWorkflowOptions = StartWorkflowOptions()
 
         def mock_build_request(workflow, args, options):
             nonlocal captured_options
@@ -374,7 +374,7 @@ def mock_build_request(workflow, args, options):
             request.workflow_id = "test-workflow-id"
             return request
 
-        client._build_start_workflow_request = Mock(side_effect=mock_build_request)
+        client._build_start_workflow_request = Mock(side_effect=mock_build_request)  # type: ignore
 
         await client.start_workflow(
             "TestWorkflow",
diff --git a/tests/cadence/worker/test_base_task_handler.py b/tests/cadence/worker/test_base_task_handler.py
index 8196240..1d3f079 100644
--- a/tests/cadence/worker/test_base_task_handler.py
+++ b/tests/cadence/worker/test_base_task_handler.py
@@ -1,8 +1,3 @@
-#!/usr/bin/env python3
-"""
-Unit tests for BaseTaskHandler class.
-"""
-
 import pytest
 from unittest.mock import Mock
 
diff --git a/tests/cadence/worker/test_decision_task_handler.py b/tests/cadence/worker/test_decision_task_handler.py
index 45e6541..78a8fe8 100644
--- a/tests/cadence/worker/test_decision_task_handler.py
+++ b/tests/cadence/worker/test_decision_task_handler.py
@@ -1,8 +1,3 @@
-#!/usr/bin/env python3
-"""
-Unit tests for DecisionTaskHandler class.
-"""
-
 import pytest
 from unittest.mock import Mock, AsyncMock, patch, PropertyMock
 
diff --git a/tests/cadence/worker/test_decision_task_handler_integration.py b/tests/cadence/worker/test_decision_task_handler_integration.py
index 71217b1..3243bae 100644
--- a/tests/cadence/worker/test_decision_task_handler_integration.py
+++ b/tests/cadence/worker/test_decision_task_handler_integration.py
@@ -1,8 +1,3 @@
-#!/usr/bin/env python3
-"""
-Integration tests for DecisionTaskHandler and WorkflowEngine.
-"""
-
 import pytest
 from unittest.mock import Mock, AsyncMock, patch
 from cadence.api.v1.service_worker_pb2 import PollForDecisionTaskResponse
@@ -39,8 +34,8 @@ def registry(self):
         """Create a registry with a test workflow."""
         reg = Registry()
 
-        @reg.workflow(name="test_workflow")
-        class TestWorkflow:
+        @reg.workflow(name="test_workflow")  # type: ignore
+        class TestWorkflow:  # type: ignore
             @workflow.run
             async def run(self, input_data):
                 """Simple test workflow that returns the input."""
diff --git a/tests/cadence/worker/test_decision_worker_integration.py b/tests/cadence/worker/test_decision_worker_integration.py
index 91368b4..311ed0a 100644
--- a/tests/cadence/worker/test_decision_worker_integration.py
+++ b/tests/cadence/worker/test_decision_worker_integration.py
@@ -1,8 +1,3 @@
-#!/usr/bin/env python3
-"""
-Integration tests for DecisionWorker with DecisionTaskHandler.
-"""
-
 import asyncio
 import pytest
 from unittest.mock import Mock, AsyncMock, patch
@@ -13,6 +8,7 @@
     HistoryEvent,
     WorkflowExecutionStartedEventAttributes,
 )
+from cadence.worker import WorkerOptions
 from cadence.worker._decision import DecisionWorker
 from cadence.worker._registry import Registry
 from cadence import workflow
@@ -52,11 +48,11 @@ async def run(self, input_data):
     @pytest.fixture
     def decision_worker(self, mock_client, registry):
         """Create a DecisionWorker instance."""
-        options = {
-            "identity": "test-worker",
-            "max_concurrent_decision_task_execution_size": 1,
-            "decision_task_pollers": 1,
-        }
+        options = WorkerOptions(
+            identity="test-worker",
+            max_concurrent_decision_task_execution_size=1,
+            decision_task_pollers=1,
+        )
         return DecisionWorker(
             client=mock_client,
             task_list="test-task-list",
@@ -297,11 +293,11 @@ async def test_decision_worker_poll_timeout(self, decision_worker, mock_client):
 
     def test_decision_worker_options_handling(self, mock_client, registry):
         """Test DecisionWorker with various options."""
-        options = {
-            "identity": "custom-worker",
-            "max_concurrent_decision_task_execution_size": 5,
-            "decision_task_pollers": 3,
-        }
+        options = WorkerOptions(
+            identity="custom-worker",
+            max_concurrent_decision_task_execution_size=5,
+            decision_task_pollers=3,
+        )
 
         worker = DecisionWorker(
             client=mock_client,
diff --git a/tests/cadence/worker/test_poller.py b/tests/cadence/worker/test_poller.py
index ee891a4..1281a79 100644
--- a/tests/cadence/worker/test_poller.py
+++ b/tests/cadence/worker/test_poller.py
@@ -8,8 +8,8 @@
 @pytest.mark.asyncio
 async def test_poller():
     permits = asyncio.Semaphore(1)
-    incoming = asyncio.Queue()
-    outgoing = asyncio.Queue()
+    incoming = asyncio.Queue[str]()
+    outgoing = asyncio.Queue[str]()
     poller = Poller(1, permits, incoming.get, outgoing.put)
 
     task = asyncio.create_task(poller.run())
@@ -25,8 +25,8 @@ async def test_poller():
 @pytest.mark.asyncio
 async def test_poller_empty_task():
     permits = asyncio.Semaphore(1)
-    incoming = asyncio.Queue()
-    outgoing = asyncio.Queue()
+    incoming = asyncio.Queue[str | None]()
+    outgoing = asyncio.Queue[str]()
     poller = Poller(1, permits, incoming.get, outgoing.put)
 
     task = asyncio.create_task(poller.run())
@@ -56,7 +56,7 @@ async def poll_func():
         await done.wait()
         return "foo"
 
-    outgoing = asyncio.Queue()
+    outgoing = asyncio.Queue[str]()
     poller = Poller(5, permits, poll_func, outgoing.put)
     task = asyncio.create_task(poller.run())
 
@@ -121,7 +121,7 @@ async def poll_func():
             await done.wait()
             return "bar"
 
-    outgoing = asyncio.Queue()
+    outgoing = asyncio.Queue[str]()
     poller = Poller(1, permits, poll_func, outgoing.put)
 
     task = asyncio.create_task(poller.run())
@@ -136,7 +136,7 @@ async def poll_func():
 async def test_poller_execute_error():
     permits = asyncio.Semaphore(1)
 
-    outgoing = asyncio.Queue()
+    outgoing = asyncio.Queue[str]()
     call_count = 0
 
     async def execute(item: str):
@@ -146,7 +146,7 @@ async def execute(item: str):
             raise RuntimeError("oh no")
         await outgoing.put(item)
 
-    incoming = asyncio.Queue()
+    incoming = asyncio.Queue[str]()
     poller = Poller(1, permits, incoming.get, execute)
 
     task = asyncio.create_task(poller.run())
diff --git a/tests/cadence/worker/test_registry.py b/tests/cadence/worker/test_registry.py
index a7040dd..4f1aefd 100644
--- a/tests/cadence/worker/test_registry.py
+++ b/tests/cadence/worker/test_registry.py
@@ -1,8 +1,4 @@
-#!/usr/bin/env python3
-"""
-Tests for the registry functionality.
-"""
-
+# type: ignore
 import pytest
 
 from cadence import activity
diff --git a/tests/cadence/worker/test_task_handler_integration.py b/tests/cadence/worker/test_task_handler_integration.py
index 920f53b..d987748 100644
--- a/tests/cadence/worker/test_task_handler_integration.py
+++ b/tests/cadence/worker/test_task_handler_integration.py
@@ -1,8 +1,3 @@
-#!/usr/bin/env python3
-"""
-Integration tests for task handlers.
-"""
-
 import pytest
 from contextlib import contextmanager
 from unittest.mock import Mock, AsyncMock, patch, PropertyMock
diff --git a/tests/integration_tests/helper.py b/tests/integration_tests/helper.py
index 6664611..3d70760 100644
--- a/tests/integration_tests/helper.py
+++ b/tests/integration_tests/helper.py
@@ -1,6 +1,6 @@
 import asyncio
 from contextlib import asynccontextmanager
-from typing import AsyncGenerator
+from typing import AsyncGenerator, Unpack
 
 from cadence import Registry
 from cadence.client import ClientOptions, Client
@@ -16,7 +16,7 @@ def __init__(self, options: ClientOptions, test_name: str) -> None:
 
     @asynccontextmanager
     async def worker(
-        self, registry: Registry, **kwargs: WorkerOptions
+        self, registry: Registry, **kwargs: Unpack[WorkerOptions]
     ) -> AsyncGenerator[Worker, None]:
         async with self.client() as client:
             worker = Worker(client, self.test_name, registry, **kwargs)
diff --git a/tests/integration_tests/workflow/test_activities.py b/tests/integration_tests/workflow/test_activities.py
index 7e6c0cc..75b8b3a 100644
--- a/tests/integration_tests/workflow/test_activities.py
+++ b/tests/integration_tests/workflow/test_activities.py
@@ -1,3 +1,4 @@
+# type: ignore
 import asyncio
 from datetime import timedelta
 
diff --git a/tests/integration_tests/workflow/test_workflows.py b/tests/integration_tests/workflow/test_workflows.py
index 4a01af1..28ee6e1 100644
--- a/tests/integration_tests/workflow/test_workflows.py
+++ b/tests/integration_tests/workflow/test_workflows.py
@@ -1,3 +1,4 @@
+# type: ignore
 from datetime import timedelta
 
 import pytest