diff --git a/temporalio/client.py b/temporalio/client.py
index 20a9b3c6d..46a30cfa7 100644
--- a/temporalio/client.py
+++ b/temporalio/client.py
@@ -463,7 +463,7 @@ async def start_workflow(
         args: Sequence[Any] = [],
         id: str,
         task_queue: str,
-        result_type: Optional[Type] = None,
+        result_type: Optional[type] = None,
         execution_timeout: Optional[timedelta] = None,
         run_timeout: Optional[timedelta] = None,
         task_timeout: Optional[timedelta] = None,
@@ -498,7 +498,7 @@ async def start_workflow(
         args: Sequence[Any] = [],
         id: str,
         task_queue: str,
-        result_type: Optional[Type] = None,
+        result_type: Optional[type] = None,
         execution_timeout: Optional[timedelta] = None,
         run_timeout: Optional[timedelta] = None,
         task_timeout: Optional[timedelta] = None,
@@ -744,7 +744,7 @@ async def execute_workflow(
         args: Sequence[Any] = [],
         id: str,
         task_queue: str,
-        result_type: Optional[Type] = None,
+        result_type: Optional[type] = None,
         execution_timeout: Optional[timedelta] = None,
         run_timeout: Optional[timedelta] = None,
         task_timeout: Optional[timedelta] = None,
@@ -779,7 +779,7 @@ async def execute_workflow(
         args: Sequence[Any] = [],
         id: str,
         task_queue: str,
-        result_type: Optional[Type] = None,
+        result_type: Optional[type] = None,
         execution_timeout: Optional[timedelta] = None,
         run_timeout: Optional[timedelta] = None,
         task_timeout: Optional[timedelta] = None,
diff --git a/temporalio/workflow.py b/temporalio/workflow.py
index e5bb25ba6..9168d328c 100644
--- a/temporalio/workflow.py
+++ b/temporalio/workflow.py
@@ -2210,7 +2210,7 @@ def start_activity(
     *,
     args: Sequence[Any] = [],
     task_queue: Optional[str] = None,
-    result_type: Optional[Type] = None,
+    result_type: Optional[type] = None,
     schedule_to_close_timeout: Optional[timedelta] = None,
     schedule_to_start_timeout: Optional[timedelta] = None,
     start_to_close_timeout: Optional[timedelta] = None,
@@ -2230,7 +2230,7 @@ def start_activity(
     *,
     args: Sequence[Any] = [],
     task_queue: Optional[str] = None,
-    result_type: Optional[Type] = None,
+    result_type: Optional[type] = None,
     schedule_to_close_timeout: Optional[timedelta] = None,
     schedule_to_start_timeout: Optional[timedelta] = None,
     start_to_close_timeout: Optional[timedelta] = None,
@@ -2426,7 +2426,7 @@ async def execute_activity(
     *,
     args: Sequence[Any] = [],
     task_queue: Optional[str] = None,
-    result_type: Optional[Type] = None,
+    result_type: Optional[type] = None,
     schedule_to_close_timeout: Optional[timedelta] = None,
     schedule_to_start_timeout: Optional[timedelta] = None,
     start_to_close_timeout: Optional[timedelta] = None,
@@ -2446,7 +2446,7 @@ async def execute_activity(
     *,
     args: Sequence[Any] = [],
     task_queue: Optional[str] = None,
-    result_type: Optional[Type] = None,
+    result_type: Optional[type] = None,
     schedule_to_close_timeout: Optional[timedelta] = None,
     schedule_to_start_timeout: Optional[timedelta] = None,
     start_to_close_timeout: Optional[timedelta] = None,