diff --git a/unit1/unit1.ipynb b/unit1/unit1.ipynb
index 62af314..105c902 100644
--- a/unit1/unit1.ipynb
+++ b/unit1/unit1.ipynb
@@ -265,6 +265,7 @@
         "!pip install gym[box2d]\n",
         "!pip install stable-baselines3[extra]\n",
         "!pip install huggingface_sb3\n",
+        "!pip install pyglet\n",
         "!pip install ale-py==0.7.4 # To overcome an issue with gym (https://github.com/DLR-RM/stable-baselines3/issues/875)"
       ]
     },
@@ -1108,4 +1109,4 @@
   },
   "nbformat": 4,
   "nbformat_minor": 0
-}
\ No newline at end of file
+}