diff --git a/semantic_router/index/pinecone.py b/semantic_router/index/pinecone.py
index f4fa0b80b0e5a4dadcb1d5d2c240a77b9ab6153d..858d56c9013c4d0190240d3cbc9bb6ab65d90b6d 100644
--- a/semantic_router/index/pinecone.py
+++ b/semantic_router/index/pinecone.py
@@ -277,7 +277,9 @@ class PineconeIndex(BaseIndex):
             elif self.sync == "merge":
                 utterances_to_include = local_utterances - remote_utterances
                 if local_utterances or remote_utterances:
-                    layer_routes[route] = list(remote_utterances.union(local_utterances))
+                    layer_routes[route] = list(
+                        remote_utterances.union(local_utterances)
+                    )
             else:
                 raise ValueError("Invalid sync mode specified")
 
diff --git a/semantic_router/layer.py b/semantic_router/layer.py
index 5852b8db14afe2d76da7598c9f86ea6d888648b3..61824033d7b0fe69919e9d577c309b3fa85cabe5 100644
--- a/semantic_router/layer.py
+++ b/semantic_router/layer.py
@@ -491,7 +491,7 @@ class RouteLayer:
             routes=route_names,
             utterances=all_utterances,
         )
-    
+
     def _add_and_sync_routes(self, routes: List[Route]):
         # create embeddings for all routes and sync at startup with remote ones based on sync setting
         all_utterances = [