diff --git a/notebooks/unit4/requirements-unit4.txt b/notebooks/unit4/requirements-unit4.txt
index 946e9aa8..2a695fea 100644
--- a/notebooks/unit4/requirements-unit4.txt
+++ b/notebooks/unit4/requirements-unit4.txt
@@ -2,4 +2,4 @@ git+https://github.com/ntasfi/PyGame-Learning-Environment.git
 git+https://github.com/simoninithomas/gym-games
 huggingface_hub
 imageio-ffmpeg
-pyyaml==6.0
+
diff --git a/units/en/unit4/hands-on.mdx b/units/en/unit4/hands-on.mdx
index 5f101e87..492c34c8 100644
--- a/units/en/unit4/hands-on.mdx
+++ b/units/en/unit4/hands-on.mdx
@@ -152,6 +152,9 @@ And you can find all the Deep Reinforcement Learning models here 👉 https://hu
 
 ```bash
 !pip install -r https://raw.githubusercontent.com/huggingface/deep-rl-class/main/notebooks/unit4/requirements-unit4.txt
+!echo 'Cython < 3.0' > /temp.txt
+!PIP_CONSTRAINT=/temp.txt pip wheel pyyaml==6.0
+!pip install 'pyyaml==6.0'
 ```
 
 ## Import the packages 📦