diff --git a/pkgs/development/python-modules/kotsu/default.nix b/pkgs/development/python-modules/kotsu/default.nix
index 4ed9b51a2879..794d4f6e2998 100644
--- a/pkgs/development/python-modules/kotsu/default.nix
+++ b/pkgs/development/python-modules/kotsu/default.nix
@@ -12,14 +12,14 @@
 
 buildPythonPackage rec {
   pname = "kotsu";
-  version = "0.3.3";
+  version = "0.4.0";
   format = "setuptools";
 
   src = fetchFromGitHub {
     owner = "datavaluepeople";
     repo = "kotsu";
-    rev = "v${version}";
-    hash = "sha256-V5OkgiLUTRNbNt6m94+aYUZd9Nw+/60LfhrqqdFhiUw=";
+    tag = "v${version}";
+    hash = "sha256-7bRrHowRKq3xiBiAkfS4ZL9PXHIUmZc99q9pHex9BLg=";
   };
 
   propagatedBuildInputs = [
@@ -38,7 +38,7 @@ buildPythonPackage rec {
   meta = {
     description = "Lightweight framework for structured and repeatable model validation";
     homepage = "https://github.com/datavaluepeople/kotsu";
-    changelog = "https://github.com/datavaluepeople/kotsu/blob/${src.rev}/CHANGELOG.md";
+    changelog = "https://github.com/datavaluepeople/kotsu/blob/${src.tag}/CHANGELOG.md";
     license = lib.licenses.mit;
     maintainers = [ ];
   };