diff --git a/semantic_router/layer.py b/semantic_router/layer.py
index 4512207f..778af03d 100644
--- a/semantic_router/layer.py
+++ b/semantic_router/layer.py
@@ -177,7 +177,7 @@ class RouteLayer:
     index: BaseIndex
 
     def __init__(
-        self
+        self,
         encoder: Optional[BaseEncoder] = None,
         llm: Optional[BaseLLM] = None,
         routes: Optional[List[Route]] = None,
@@ -435,8 +435,29 @@ def add(self, route: Route):
     def list_route_names(self) -> List[str]:
         return [route.name for route in self.routes]
 
-    def update(self, route_name: str, utterances: List[str]):
-        raise NotImplementedError("This method has not yet been implemented.")
+    def update(self, name: str, threshold: Optional[float] = None, utterances: Optional[List[str]] = None):
+        """Updates the route specified in name. Allows the update of
+        threshold and/or utterances. If no values are provided via the
+        threshold or utterances parameters, those fields are not updated.
+        If neither field is provided raises a ValueError.
+
+        The name must exist within the local RouteLayer, if not a
+        KeyError will be raised.
+        """
+
+        if threshold is None and utterances is None:
+            raise ValueError("At least one of 'threshold' or 'utterances' must be provided.")
+        if utterances:
+            raise NotImplementedError("The update method cannot be used for updating utterances yet.")
+        
+        route = self.get(name)
+        if route:
+            if threshold:
+                old_threshold = route.score_threshold
+                route.score_threshold = threshold
+                logger.info(f"Updated threshold for route '{route.name}' from {old_threshold} to {threshold}")
+        else:
+            raise ValueError(f"Route '{name}' not found. Nothing updated.")
 
     def delete(self, route_name: str):
         """Deletes a route given a specific route name.