diff --git a/pkgs/development/python-modules/pycares/default.nix b/pkgs/development/python-modules/pycares/default.nix
index e0f145ca689a..c8e8fdb7b3d9 100644
--- a/pkgs/development/python-modules/pycares/default.nix
+++ b/pkgs/development/python-modules/pycares/default.nix
@@ -8,11 +8,11 @@
 
 buildPythonPackage rec {
   pname = "pycares";
-  version = "4.2.0";
+  version = "4.2.1";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "sha256-soZklZd5HNUwcrLzODzDj8FKirAWt4ywS9yqbszjuM4=";
+    sha256 = "sha256-c1tPdf0PWVxOkYTaGM2Hc39GvIGmTqQfTtzitraNRtI=";
   };
 
   buildInputs = [