diff --git a/pkgs/development/python-modules/gym/default.nix b/pkgs/development/python-modules/gym/default.nix
index ea920663846..e27aed0627b 100644
--- a/pkgs/development/python-modules/gym/default.nix
+++ b/pkgs/development/python-modules/gym/default.nix
@@ -5,11 +5,11 @@
 
 buildPythonPackage rec {
   pname = "gym";
-  version = "0.12.1";
+  version = "0.12.5";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "f8bee3672759aeec4271169dcbb2afc069b898c7f92882d965c59be8085f2b35";
+    sha256 = "027422f59b662748eae3420b804e35bbf953f62d40cd96d2de9f842c08de822e";
   };
 
   propagatedBuildInputs = [