diff --git a/requirements.txt b/requirements.txt
index 790d1570a8a..7069d096165 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,9 +1,9 @@
 atari-py==0.2.6
 opencv-python>=3.
-box2d-py~=2.3.5
+box2d-py==2.3.5
 mujoco_py>=1.50, <2.0
 scipy>=1.4.1
 numpy>=1.18.0
 pyglet>=1.4.0
 cloudpickle>=1.2.0
-lz4>=3.1.0
\ No newline at end of file
+lz4>=3.1.0