diff --git a/python/unittest_py/requirements.txt b/python/unittest_py/requirements.txt
index f70037e71611fb4a55b27ff71c49a976e6b2034e..2af2013eff0931f51390ade1288943ddf611b169 100644
--- a/python/unittest_py/requirements.txt
+++ b/python/unittest_py/requirements.txt
@@ -3,7 +3,7 @@ PyGithub
 coverage==5.5
 pycrypto ; platform_system != "Windows"
 mock
-gym
+gym==0.25.2
 pygame==2.1.0
 hypothesis
 opencv-python<=4.2.0.32