diff --git a/pkgs/development/python-modules/plantuml-markdown/default.nix b/pkgs/development/python-modules/plantuml-markdown/default.nix
index 600131e2f5ec..50e6bb2cf941 100644
--- a/pkgs/development/python-modules/plantuml-markdown/default.nix
+++ b/pkgs/development/python-modules/plantuml-markdown/default.nix
@@ -13,7 +13,7 @@
 
 buildPythonPackage rec {
   pname = "plantuml-markdown";
-  version = "3.9.3";
+  version = "3.9.4";
   format = "setuptools";
 
   disabled = pythonOlder "3.7";
@@ -22,7 +22,7 @@ buildPythonPackage rec {
     owner = "mikitex70";
     repo = pname;
     rev = "refs/tags/${version}";
-    hash = "sha256-2nZV/bYRN1SKI6OmpOhK7KUuBwmwhTt/ErTYqVQ9Dps=";
+    hash = "sha256-DSR4/PEs1uzGHgtw5p3HMlquOIYHPWbTHrw6QGx7t4o=";
   };
 
   propagatedBuildInputs = [