diff --git a/src/utils/resources.py b/src/utils/resources.py
index f6a58c964..7acc84016 100644
--- a/src/utils/resources.py
+++ b/src/utils/resources.py
@@ -152,26 +152,29 @@ class AppResource:
             "__APP__": self.app,
             "__YNH_ARCH__": system_arch(),
             "__YNH_DEBIAN_VERSION__": debian_version(),
+            "__YNH_APP_UPSTREAM_VERSION__": manager.wanted["version"].split("~")[0] if manager.wanted else manager.current["version"].split("~")[0],
         }
 
         def recursive_apply(function: Callable, data: Any) -> Any:
             if isinstance(data, dict):  # FIXME: hashable?
                 return {
-                    key: recursive_apply(value, function) for key, value in data.items()
+                    key: recursive_apply(function, value) for key, value in data.items()
                 }
 
             if isinstance(data, list):  # FIXME: iterable?
-                return [recursive_apply(value, function) for value in data]
+                return [recursive_apply(function, value) for value in data]
 
             return function(data)
 
         def replace_tokens_in_strings(data: Any):
             if not isinstance(data, str):
-                return
+                return data
             for token, replacement in replacements.items():
                 data = data.replace(token, replacement)
 
-        recursive_apply(replace_tokens_in_strings, properties)
+            return data
+
+        properties = recursive_apply(replace_tokens_in_strings, properties)
 
         for key, value in properties.items():
             setattr(self, key, value)