diff --git a/unit2/unit2.ipynb b/unit2/unit2.ipynb
index e122820..eefa1da 100644
--- a/unit2/unit2.ipynb
+++ b/unit2/unit2.ipynb
@@ -201,7 +201,7 @@
       "cell_type": "code",
       "source": [
         "%%capture\n",
-        "!pip install git+https://github.com/openai/gym.git # We install gym using git since Taxi-v3 \"rgb_array version\" is not on PyPi release\n",
+        "!pip install git+https://github.com/openai/gym.git@a37b956d57bdb024ccd8fef5446ba159e32d4626 # We install gym using git since Taxi-v3 \"rgb_array version\" is not on PyPi release\n",
         "!pip install pygame\n",
         "!pip install numpy\n",
         "\n",