diff --git a/notebooks/unit1/requirements-unit1.txt b/notebooks/unit1/requirements-unit1.txt
index fd27dfc1..f74ac2a5 100644
--- a/notebooks/unit1/requirements-unit1.txt
+++ b/notebooks/unit1/requirements-unit1.txt
@@ -1,4 +1,5 @@
 stable-baselines3==2.0.0a5
 swig
-gymnasium[box2d]
+gymnasium
+box2d-py
 huggingface_sb3