diff --git a/src/baby_monitor/repositories/token/memory_token.py b/src/baby_monitor/repositories/token/memory_token.py
index 409c076..735ff4d 100644
--- a/src/baby_monitor/repositories/token/memory_token.py
+++ b/src/baby_monitor/repositories/token/memory_token.py
@@ -25,7 +25,7 @@ class InMemoryTokenRepository(TokenRepositoryInterface):
 
     def verify(self, token: str) -> int | None:
         """Verify token and return user_id if valid, None otherwise.
-        
+
         Implements sliding expiration: extends token lifetime on each verification.
         """
         if token not in self._tokens:
diff --git a/src/baby_monitor/repositories/token/redis_token.py b/src/baby_monitor/repositories/token/redis_token.py
index 52abda5..044c8dd 100644
--- a/src/baby_monitor/repositories/token/redis_token.py
+++ b/src/baby_monitor/repositories/token/redis_token.py
@@ -30,7 +30,7 @@ class RedisTokenRepository(TokenRepositoryInterface):
 
     def verify(self, token: str) -> int | None:
         """Verify token and return user_id if valid, None otherwise.
-        
+
         Implements sliding expiration: extends token lifetime on verification.
         """
         key = f"token:{token}"