diff --git a/pkgs/development/python-modules/mt-940/default.nix b/pkgs/development/python-modules/mt-940/default.nix
index c41b472a693..d28cda99d74 100644
--- a/pkgs/development/python-modules/mt-940/default.nix
+++ b/pkgs/development/python-modules/mt-940/default.nix
@@ -3,12 +3,12 @@
 }:
 
 buildPythonPackage rec {
-  version = "4.19.0";
+  version = "4.21.0";
   pname = "mt-940";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "5d109e8dc4b490a4b92ec0153713710eb067b36b350ce1ff60c406afddc7d3cd";
+    sha256 = "7cbd88fd7252d5a2694593633b31f819eb302423058fecb9f9959e74c01c2b86";
   };
 
   propagatedBuildInputs = lib.optional (!isPy3k) enum34;