diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2d89be55..27d5bebc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## 0.9.1 (2025-04-04)
+
+### Changes
+
+- Fix typing annotation.
+
 ## 0.9.0 (2025-03-28)
 
 ### Changes
diff --git a/python/mujinwebstackclient/controllerwebclientraw.py b/python/mujinwebstackclient/controllerwebclientraw.py
index c52c599d..62c21540 100644
--- a/python/mujinwebstackclient/controllerwebclientraw.py
+++ b/python/mujinwebstackclient/controllerwebclientraw.py
@@ -499,7 +499,7 @@ async def _StopAllSubscriptions(self, error: Optional[ControllerGraphClientExcep
             subscription.GetSubscriptionCallbackFunction()(error=error, response=None)
         self._subscriptions.clear()
 
-    def SubscribeGraphAPI(self, query: str, callbackFunction: Callable[[Optional[str], Optional[dict]], None], variables: Optional[dict] = None) -> Subscription:
+    def SubscribeGraphAPI(self, query: str, callbackFunction: Callable[[Optional[ControllerGraphClientException], Optional[dict]], None], variables: Optional[dict] = None) -> Subscription:
         """ Subscribes to changes on Mujin controller.
 
         Args:
diff --git a/python/mujinwebstackclient/version.py b/python/mujinwebstackclient/version.py
index 2e74f534..afd8b87a 100644
--- a/python/mujinwebstackclient/version.py
+++ b/python/mujinwebstackclient/version.py
@@ -1,4 +1,4 @@
-__version__ = '0.9.0'
+__version__ = '0.9.1'
 
 # Do not forget to update CHANGELOG.md