diff --git a/requirements.txt b/requirements.txt
index 19e0d55..2e7cb31 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,4 +4,5 @@ cosmic_ray
 nose
 locustio
 safety
-pylama
\ No newline at end of file
+pylama
+aiohttp>=3.9.4 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file