diff --git a/python/requirements/rllib/requirements_rllib.txt b/python/requirements/rllib/requirements_rllib.txt
index 49aacffe55e3..dcf63392a0ef 100644
--- a/python/requirements/rllib/requirements_rllib.txt
+++ b/python/requirements/rllib/requirements_rllib.txt
@@ -19,7 +19,7 @@ gym[atari]==0.18.3
 # Kaggle envs.
 kaggle_environments==1.7.11
 # Unity3D testing
-mlagents==0.26.0
+mlagents==0.27.0
 mlagents_envs==0.26.0
 # For tests on PettingZoo's multi-agent envs.
 pettingzoo==1.11.0