diff --git a/notebooks/unit1/requirements-unit1.txt b/notebooks/unit1/requirements-unit1.txt
index fd27dfc1..4f2d92ab 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]==0.29.1
+pygame==2.5.2
 huggingface_sb3