diff --git a/01-hello/src/entry.py b/01-hello/src/entry.py
index abf34ca..7f5eadd 100644
--- a/01-hello/src/entry.py
+++ b/01-hello/src/entry.py
@@ -1,4 +1,5 @@
-from workers import Response
+from workers import handler, Response
 
+@handler
 async def on_fetch(request, env):
     return Response("Hello world!")
diff --git a/02-binding/src/entry.py b/02-binding/src/entry.py
index bf8f081..1baf0cb 100644
--- a/02-binding/src/entry.py
+++ b/02-binding/src/entry.py
@@ -1,5 +1,6 @@
-from workers import Response
+from workers import handler, Response
 
+@handler
 async def on_fetch(request, env):
     await env.FOO.put("bar", "baz")
     bar = await env.FOO.get("bar")
diff --git a/04-langchain/src/worker.py b/04-langchain/src/worker.py
index 710b281..3a029db 100644
--- a/04-langchain/src/worker.py
+++ b/04-langchain/src/worker.py
@@ -1,7 +1,8 @@
-from workers import Response
+from workers import handler, Response
 from langchain_core.prompts import PromptTemplate
 from langchain_openai import OpenAI
 
+@handler
 async def on_fetch(request, env):
   prompt = PromptTemplate.from_template("Complete the following sentence: I am a {profession} and ")
   llm = OpenAI(api_key=env.API_KEY)
diff --git a/05-query-d1/src/entry.py b/05-query-d1/src/entry.py
index 19120de..ade57bd 100644
--- a/05-query-d1/src/entry.py
+++ b/05-query-d1/src/entry.py
@@ -1,5 +1,6 @@
-from workers import Response
+from workers import handler, Response
 
+@handler
 async def on_fetch(request, env):
     query = """
         SELECT quote, author
@@ -8,7 +9,7 @@ async def on_fetch(request, env):
         LIMIT 1;
         """
     results = await env.DB.prepare(query).all()
-    data = results.results[0] 
+    data = results.results[0]
 
     # Return a JSON response
     return Response.json(data)