diff --git a/dev-requirements.txt b/dev-requirements.txt
index a663c848..34e7c703 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -3,4 +3,4 @@
 pytest==7.0.1  # last version to support Python 3.6
 flake8==5.0.4
 pytest-timeout==2.1.0
-pytest-aiohttp==1.0.4
+pytest-aiohttp==0.3.0  # last version to support Python 3.6