diff --git a/dev-requirements.txt b/dev-requirements.txt
index 2fcd8159a..2dfb698e8 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -1,7 +1,8 @@
 pytest==8.4.2  # version 8.4.2 is the last one supporting Python 3.9
 flake8==7.3.0
 pytest-timeout==2.4.0
-pytest-asyncio==1.3.0
+pytest-asyncio==1.2.0; python_version == '3.9' # version 1.2.0 is the last one supporting Python 3.9
+pytest-asyncio==1.3.0; python_version >= '3.10'
 requests==2.32.5
 httpx==0.28.1
 httpx_ws==0.7.1  # upgrading leads to failures in tests
\ No newline at end of file