diff --git a/google/api_core/retry/retry_streaming.py b/google/api_core/retry/retry_streaming.py
index e113323b..00666841 100644
--- a/google/api_core/retry/retry_streaming.py
+++ b/google/api_core/retry/retry_streaming.py
@@ -59,8 +59,8 @@ def retry_target_stream(
         [List[Exception], RetryFailureReason, Optional[float]],
         Tuple[Exception, Optional[Exception]],
     ] = build_retry_error,
-    init_args: _P.args = (),
-    init_kwargs: _P.kwargs = {},
+    init_args: tuple = (),
+    init_kwargs: dict = {},
     **kwargs,
 ) -> Generator[_Y, Any, None]:
     """Create a generator wrapper that retries the wrapped stream if it fails.
diff --git a/google/api_core/retry/retry_streaming_async.py b/google/api_core/retry/retry_streaming_async.py
index 2924ba14..942abf5f 100644
--- a/google/api_core/retry/retry_streaming_async.py
+++ b/google/api_core/retry/retry_streaming_async.py
@@ -62,8 +62,8 @@ async def retry_target_stream(
         [list[Exception], RetryFailureReason, float | None],
         tuple[Exception, Exception | None],
     ] = build_retry_error,
-    init_args: _P.args = (),
-    init_kwargs: _P.kwargs = {},
+    init_args: tuple = (),
+    init_kwargs: dict = {},
     **kwargs,
 ) -> AsyncGenerator[_Y, None]:
     """Create a generator wrapper that retries the wrapped stream if it fails.
diff --git a/noxfile.py b/noxfile.py
index c318c49f..ac21330e 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -274,9 +274,7 @@ def pytype(session):
 @nox.session(python=DEFAULT_PYTHON_VERSION)
 def mypy(session):
     """Run type-checking."""
-    # TODO(https://github.com/googleapis/python-api-core/issues/799):
-    # Remove mypy constraint. We should use the latest version of mypy.
-    session.install(".[grpc,async_rest]", "mypy<1.15.0")
+    session.install(".[grpc,async_rest]", "mypy")
     session.install(
         "types-setuptools",
         "types-requests",