diff --git a/setup.py b/setup.py
index b73ab02f..5b2f9852 100644
--- a/setup.py
+++ b/setup.py
@@ -15,7 +15,7 @@
 # - 0.18-0.21 require setuptools<=65.5.0
 
 GYMNASIUM_VERSION = '0.29.1'
-GYM_VERSION = '0.21'
+GYM_VERSION = '0.23'
 PETTINGZOO_VERSION = '1.24.1'
 SHIMMY = 'shimmy[gym-v21]'