diff --git a/projects/samples/howto/openai_gym/controllers/openai_gym/openai_gym.py b/projects/samples/howto/openai_gym/controllers/openai_gym/openai_gym.py
index 5ece82b5ca5..a0df0a7136f 100644
--- a/projects/samples/howto/openai_gym/controllers/openai_gym/openai_gym.py
+++ b/projects/samples/howto/openai_gym/controllers/openai_gym/openai_gym.py
@@ -23,7 +23,7 @@
 except ImportError:
     sys.exit(
         'Please make sure you have all dependencies installed. '
-        'Run: "pip3 install numpy gym stable_baselines3"'
+        'Run: "pip3 install numpy gym==0.21 stable_baselines3"'
     )