diff --git a/pkgs/development/python-modules/xmlschema/default.nix b/pkgs/development/python-modules/xmlschema/default.nix
index 660f520c246b..6f10a4962c31 100644
--- a/pkgs/development/python-modules/xmlschema/default.nix
+++ b/pkgs/development/python-modules/xmlschema/default.nix
@@ -12,7 +12,7 @@
 
 buildPythonPackage rec {
   pname = "xmlschema";
-  version = "3.4.2";
+  version = "3.4.3";
   pyproject = true;
 
   disabled = pythonOlder "3.7";
@@ -21,7 +21,7 @@ buildPythonPackage rec {
     owner = "sissaschool";
     repo = "xmlschema";
     rev = "refs/tags/v${version}";
-    hash = "sha256-0x8nk8F+kg5SSDQI4dOnv67ilyN4z2MZ5phPC3PW4WQ=";
+    hash = "sha256-7RA9lQwuty8aZghwTKNbU+oL+BATH2FVIRQBe9fIpHI=";
   };
 
   build-system = [ setuptools ];