diff --git a/pkgs/development/python-modules/pypng/default.nix b/pkgs/development/python-modules/pypng/default.nix
index 7a1f1546ed8a..d618e3266bde 100644
--- a/pkgs/development/python-modules/pypng/default.nix
+++ b/pkgs/development/python-modules/pypng/default.nix
@@ -15,7 +15,7 @@ buildPythonPackage rec {
     owner = "drj11";
     repo = "pypng";
     tag = "pypng-${version}";
-    hash = "sha256-tTnsGCAmHexDWm/T5xpHpcBaQcBEqMfTFaoOAeC+pDs=";
+    hash = "sha256-xNUI3yGfwmaccCxgljIZzgJ6YgNxcuOzCXDE7RFJP2I=";
   };
 
   build-system = [ setuptools ];