diff --git a/requirements-dev.txt b/requirements-dev.txt
index 7333d9f..34f5c77 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -3,3 +3,4 @@ pytest-asyncio
 pytest-cov
 pytest-mock
 aioresponses
+aiohttp>=3.9.0 # not directly required, pinned by Snyk to avoid a vulnerability