diff --git a/pkgs/development/python-modules/dnslib/default.nix b/pkgs/development/python-modules/dnslib/default.nix
index 16d1dd356861..2d70c00579eb 100644
--- a/pkgs/development/python-modules/dnslib/default.nix
+++ b/pkgs/development/python-modules/dnslib/default.nix
@@ -2,11 +2,11 @@
 
 buildPythonPackage rec {
   pname = "dnslib";
-  version = "0.9.20";
+  version = "0.9.21";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "sha256-ApCrXQj6vR74XvFD0cM/3NVJyy5Qd57BpCOZiw0LKUU=";
+    sha256 = "sha256-IXabARWP5wvokSF1Q0nyg13M3yHVwBHOyfoopI+lVdQ=";
   };
 
   checkPhase = "VERSIONS=${python.interpreter} ./run_tests.sh";