diff --git a/py/server/deephaven/liveness_scope.py b/py/server/deephaven/liveness_scope.py
index 77a6464e847..00d4ec47c4a 100644
--- a/py/server/deephaven/liveness_scope.py
+++ b/py/server/deephaven/liveness_scope.py
@@ -59,7 +59,7 @@ def __exit__(self, exc_type, exc_val, exc_tb):
         _pop(self.j_scope)
         self.release()
 
-    def release(self):
+    def release(self) -> None:
         """Closes the LivenessScope and releases all the query graph resources.
 
         Raises: