diff --git a/semantic_router/schema.py b/semantic_router/schema.py
index fb4b6825221f1ab3c83fe97d0529109c47fb21e6..273043f55ced8f5fdedb2b91e2ef9b0d35ee3d17 100644
--- a/semantic_router/schema.py
+++ b/semantic_router/schema.py
@@ -1,4 +1,4 @@
-from datetime import datetime
+from datetime import datetime, timezone
 from difflib import Differ
 from enum import Enum
 import json
@@ -64,7 +64,7 @@ class ConfigParameter(BaseModel):
     value: str
     scope: Optional[str] = None
     created_at: str = Field(
-        default_factory=lambda: datetime.now(datetime.UTC).isoformat()
+        default_factory=lambda: datetime.now(timezone.utc).isoformat()
     )
 
     def to_pinecone(self, dimensions: int):