diff --git a/python/requirements/rllib/requirements_rllib.txt b/python/requirements/rllib/requirements_rllib.txt
index 5fea06f04960..a3359134583b 100644
--- a/python/requirements/rllib/requirements_rllib.txt
+++ b/python/requirements/rllib/requirements_rllib.txt
@@ -36,7 +36,7 @@ recsim==0.2.4
 # For MAML on PyTorch.
 higher==0.2.1
 # For auto-generating an env-rendering Window.
-pyglet==1.5.0
+pyglet==1.5.21
 # For JSON reader/writer.
 smart_open==5.0.0
 # Ray Serve example