diff --git a/pkgs/development/python-modules/pytm/default.nix b/pkgs/development/python-modules/pytm/default.nix
index be8f5089466e..5f5722159a1c 100644
--- a/pkgs/development/python-modules/pytm/default.nix
+++ b/pkgs/development/python-modules/pytm/default.nix
@@ -10,15 +10,15 @@
 
 buildPythonPackage rec {
   pname = "pytm";
-  version = "1.2.0";
+  version = "1.3.0";
   format = "setuptools";
   disabled = pythonOlder "3.6";
 
   src = fetchFromGitHub {
     owner = "izar";
     repo = pname;
-    rev = "v${version}";
-    sha256 = "1bx4s9a5kdyr2xvpw0smmh7zi9w38891yfqzdj1bmnsjl57x6qrg";
+    rev = "refs/tags/v${version}";
+    sha256 = "sha256-R/MDz6lCvUxtn6IJ8STHlWzkSjnUJziO+oPnaYhrr7U=";
   };
 
   propagatedBuildInputs = [ pydal graphviz pandoc plantuml ];