add missing type annotation

canonical · Oct 17, 2023 · 46896f8 · 46896f8
1 parent e13d2f7
commit 46896f8
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/upgrade.py b/src/upgrade.py
@@ -193,7 +193,7 @@ def _unit_workload_versions(self) -> dict[str, str]:
 
     @property
     @abc.abstractmethod
-    def _app_workload_version(self):
+    def _app_workload_version(self) -> str:
         """Unique identifier for the app's workload version
 
         This should match the workload version in the current Juju app charm version.