diff --git a/python/requirements/ml/requirements_rllib.txt b/python/requirements/ml/requirements_rllib.txt
index 3c182da516a5..e300a851aa5e 100644
--- a/python/requirements/ml/requirements_rllib.txt
+++ b/python/requirements/ml/requirements_rllib.txt
@@ -25,7 +25,7 @@ tensorflow_estimator==2.6.0
 # For MAML on PyTorch.
 higher==0.2.1
 # For auto-generating an env-rendering Window.
-pyglet==1.5.15
+pyglet==1.5.21
 imageio-ffmpeg==0.4.5
 # For JSON reader/writer.
 smart_open==5.0.0