diff --git a/samples/agent/adk/contact_lookup/__main__.py b/samples/agent/adk/contact_lookup/__main__.py
index d9e4ebed6..7353ed2f3 100644
--- a/samples/agent/adk/contact_lookup/__main__.py
+++ b/samples/agent/adk/contact_lookup/__main__.py
@@ -89,7 +89,7 @@ def main(host, port):
 
         app.add_middleware(
             CORSMiddleware,
-            allow_origins=["http://localhost:5173"],
+            allow_origin_regex=r"http://localhost:\d+",
             allow_credentials=True,
             allow_methods=["*"],
             allow_headers=["*"],
diff --git a/samples/agent/adk/contact_lookup/a2ui_examples.py b/samples/agent/adk/contact_lookup/a2ui_examples.py
index e63babb31..0e59b4a55 100644
--- a/samples/agent/adk/contact_lookup/a2ui_examples.py
+++ b/samples/agent/adk/contact_lookup/a2ui_examples.py
@@ -159,4 +159,5 @@
   } }
 ]
 ---END FOLLOW_SUCCESS_EXAMPLE---
+"""
 
diff --git a/samples/agent/adk/restaurant_finder/__main__.py b/samples/agent/adk/restaurant_finder/__main__.py
index 4503a4ef7..6bca50c2b 100644
--- a/samples/agent/adk/restaurant_finder/__main__.py
+++ b/samples/agent/adk/restaurant_finder/__main__.py
@@ -89,7 +89,7 @@ def main(host, port):
 
         app.add_middleware(
             CORSMiddleware,
-            allow_origins=["http://localhost:5173"],
+            allow_origin_regex=r"http://localhost:\d+",
             allow_credentials=True,
             allow_methods=["*"],
             allow_headers=["*"],