diff --git a/pkgs/development/python-modules/xmlschema/default.nix b/pkgs/development/python-modules/xmlschema/default.nix
index 7008814ba287..6c2118f391b4 100644
--- a/pkgs/development/python-modules/xmlschema/default.nix
+++ b/pkgs/development/python-modules/xmlschema/default.nix
@@ -5,14 +5,14 @@
 }:
 
 buildPythonPackage rec {
-  version = "1.6.2";
+  version = "1.6.4";
   pname = "xmlschema";
 
   src = fetchFromGitHub {
     owner = "sissaschool";
     repo = "xmlschema";
     rev = "v${version}";
-    sha256 = "sha256-GL2PlHxKDSEsZwHPBAy+tjBSbKyvlbXUWwXakKPmzSs=";
+    sha256 = "sha256-0KVGu163t3stCgx7aWW/Ggf6CUW2ZhOOnPU6FfGHfKA=";
   };
 
   propagatedBuildInputs = [ elementpath ];