diff --git a/Main Course.ipynb b/Main Course.ipynb
index 0ed7b81..fc4bea7 100644
--- a/Main Course.ipynb	
+++ b/Main Course.ipynb	
@@ -24,6 +24,7 @@
    "outputs": [],
    "source": [
     "!pip install stable-baselines3[extra]"
+    "!pip install gym[all]"
    ]
   },
   {