diff --git a/requirements.txt b/requirements.txt
index 257e750..1094eae 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
 flask
 line-bot-sdk
-requests
\ No newline at end of file
+requests
+aiohttp>=3.9.4 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file