diff --git a/run.py b/run.py
index 182e66061..85c2f71ab 100644
--- a/run.py
+++ b/run.py
@@ -147,7 +147,7 @@ async def global_execution_handler(request: Request, exc: Exception) -> Response
     app.add_middleware(ServerErrorMiddleware, handler=global_execution_handler)
 
     # CORS用のヘッダを生成するミドルウェア
-    localhost_regex = "^https?://(localhost|127\\.0\\.0\\.1)(:[0-9]+)?$"
+    localhost_regex = "^https?://(localhost|127\\.0\\.0\\.1|\\[::1\\])(:[0-9]+)?$"
     compiled_localhost_regex = re.compile(localhost_regex)
     allowed_origins = ["*"]
     if cors_policy_mode == "localapps":