diff --git a/slowapi/extension.py b/slowapi/extension.py
index 344a16f..050f882 100644
--- a/slowapi/extension.py
+++ b/slowapi/extension.py
@@ -633,7 +633,7 @@ class Limiter:
             if isinstance(e, RateLimitExceeded):
                 raise
             if self._in_memory_fallback_enabled and not self._storage_dead:
-                self.logger.warn(
+                self.logger.warning(
                     "Rate limit storage unreachable - falling back to"
                     " in-memory storage"
                 )