diff --git a/pkgs/development/python-modules/zope-size/default.nix b/pkgs/development/python-modules/zope-size/default.nix
index 36e009c142e6..0d5f1a4778f0 100644
--- a/pkgs/development/python-modules/zope-size/default.nix
+++ b/pkgs/development/python-modules/zope-size/default.nix
@@ -12,13 +12,13 @@
 
 buildPythonPackage rec {
   pname = "zope-size";
-  version = "5.0";
+  version = "5.1";
   pyproject = true;
 
   src = fetchPypi {
     pname = "zope.size";
     inherit version;
-    hash = "sha256-sVRT40+Bb/VFmtg82TUCmqWBxqRTRj4DxeLZe9IKQyo=";
+    hash = "sha256-88OaPLxG6AnxlkGxLaFn6nzbPgWu8z9WmXOireHvgAk=";
   };
 
   build-system = [ setuptools ];