diff --git a/pkgs/development/python-modules/preprocess-cancellation/default.nix b/pkgs/development/python-modules/preprocess-cancellation/default.nix
index dc571f076fe3..d8f60c653ddc 100644
--- a/pkgs/development/python-modules/preprocess-cancellation/default.nix
+++ b/pkgs/development/python-modules/preprocess-cancellation/default.nix
@@ -10,7 +10,7 @@
 
 buildPythonPackage rec {
   pname = "preprocess-cancellation";
-  version = "0.2.0";
+  version = "0.2.1";
   disabled = pythonOlder "3.6"; # >= 3.6
   format = "pyproject";
 
@@ -18,8 +18,8 @@ buildPythonPackage rec {
   src = fetchFromGitHub {
     owner = "kageurufu";
     repo = "cancelobject-preprocessor";
-    rev = version;
-    hash = "sha256-mn3/etXA5dkL+IsyxwD4/XjU/t4/roYFVyqQxlLOoOI=";
+    rev = "refs/tags/${version}";
+    hash = "sha256-MJ4mwOFswLYHhg2LNZ+/ZwDvSjoxElVxlaWjArHV2NY=";
   };
 
   patches = [