diff --git a/setup.py b/setup.py
index d33850a..5c0f3d4 100644
--- a/setup.py
+++ b/setup.py
@@ -3,5 +3,5 @@
 setup(
     name='gym_go',
     version='0.0.1',
-    install_requires=['gym']  # and other dependencies
+    install_requires=['gym==0.20.0']  # and other dependencies
 )