diff --git a/pkgs/development/python-modules/gymnasium/default.nix b/pkgs/development/python-modules/gymnasium/default.nix
index 8f1e182d4347..77e936f2face 100644
--- a/pkgs/development/python-modules/gymnasium/default.nix
+++ b/pkgs/development/python-modules/gymnasium/default.nix
@@ -38,7 +38,7 @@
 
 buildPythonPackage rec {
   pname = "gymnasium";
-  version = "1.2.2";
+  version = "1.2.3";
 
   pyproject = true;
 
@@ -46,7 +46,7 @@ buildPythonPackage rec {
     owner = "Farama-Foundation";
     repo = "gymnasium";
     tag = "v${version}";
-    hash = "sha256-GD/ZC6BRcsIiVrvTz3j2hg10tbJMfCou/ydUFbC2fc4=";
+    hash = "sha256-b712BPs7AS8UE8Zsu9GW/J6Vag9NB/x728MtQ5yrjbY=";
   };
 
   build-system = [ setuptools ];