diff --git a/pkgs/development/python-modules/widlparser/default.nix b/pkgs/development/python-modules/widlparser/default.nix
index 9b961c89a9a9..4ac8b869b443 100644
--- a/pkgs/development/python-modules/widlparser/default.nix
+++ b/pkgs/development/python-modules/widlparser/default.nix
@@ -11,7 +11,7 @@
 
 buildPythonPackage rec {
   pname = "widlparser";
-  version = "1.1.5";
+  version = "1.4.0";
   pyproject = true;
 
   disabled = pythonOlder "3.7";
@@ -20,7 +20,7 @@ buildPythonPackage rec {
     owner = "plinss";
     repo = "widlparser";
     rev = "v${version}";
-    hash = "sha256-G5N29K0/ByfKwP1XfxZH9u/5x361JD/8qAD6eZaySnU=";
+    hash = "sha256-vYDldZH49GfNRjKh3x0DX05jYFOLQtA//7bw+B16O1M=";
   };
 
   build-system = [
@@ -32,7 +32,7 @@ buildPythonPackage rec {
 
   pythonImportsCheck = [ "widlparser" ];
 
-  # https://github.com/plinss/widlparser/blob/v1.1.5/.github/workflows/test.yml
+  # https://github.com/plinss/widlparser/blob/v1.4.0/.github/workflows/test.yml
   checkPhase = ''
     runHook preCheck