diff --git a/pkgs/development/python-modules/gpy/default.nix b/pkgs/development/python-modules/gpy/default.nix
index 176200e95c8e..161c364694e3 100644
--- a/pkgs/development/python-modules/gpy/default.nix
+++ b/pkgs/development/python-modules/gpy/default.nix
@@ -16,7 +16,7 @@
 
 buildPythonPackage rec {
   pname = "gpy";
-  version = "1.13.0";
+  version = "1.13.1";
   pyproject = true;
 
   disabled = pythonOlder "3.9";
@@ -25,8 +25,8 @@ buildPythonPackage rec {
   src = fetchFromGitHub {
     owner = "SheffieldML";
     repo = "GPy";
-    rev = "refs/tags/v.${version}";
-    hash = "sha256-2HKKKBD/JFSeLQGvvgObxqxv9IHEKFnpaejdKbYZbmY=";
+    rev = "refs/tags/v${version}";
+    hash = "sha256-ykoGdXy1uagKrP9Nqn74mDESZwKVPq6wQgnHlCznevM=";
   };
 
   nativeBuildInputs = [ setuptools ];