diff --git a/pkgs/development/python-modules/scikit-hep-testdata/default.nix b/pkgs/development/python-modules/scikit-hep-testdata/default.nix
index fe87242b9c9..ed0cbd28acb 100644
--- a/pkgs/development/python-modules/scikit-hep-testdata/default.nix
+++ b/pkgs/development/python-modules/scikit-hep-testdata/default.nix
@@ -10,7 +10,7 @@
 
 buildPythonPackage rec {
   pname = "scikit-hep-testdata";
-  version = "0.4.20";
+  version = "0.4.21";
   format = "pyproject";
 
   # fetch from github as we want the data files
@@ -19,7 +19,7 @@ buildPythonPackage rec {
     owner = "scikit-hep";
     repo = pname;
     rev = "refs/tags/v${version}";
-    sha256 = "sha256-xUXHacUIOr309HCHpzFw0g4i0bgiYcvYTCwBBbVVlR0=";
+    sha256 = "sha256-DhOtoxjhczsYqOn+CwLGlRIPa2hh7mH6EfwcLLPMQcw=";
   };
 
   nativeBuildInputs = [