diff --git a/pkgs/top-level/perl-packages.nix b/pkgs/top-level/perl-packages.nix
index c96189e42221..9bc50f9cd628 100644
--- a/pkgs/top-level/perl-packages.nix
+++ b/pkgs/top-level/perl-packages.nix
@@ -12861,10 +12861,10 @@ let
 
   NetDNS = buildPerlPackage {
     pname = "Net-DNS";
-    version = "1.20";
+    version = "1.21";
     src = fetchurl {
-      url = mirror://cpan/authors/id/N/NL/NLNETLABS/Net-DNS-1.20.tar.gz;
-      sha256 = "7fd9692b687253baa8f2eb639f1dd7ff9c77fddd67167dc59b400bd25e4ce01b";
+      url = mirror://cpan/authors/id/N/NL/NLNETLABS/Net-DNS-1.21.tar.gz;
+      sha256 = "ddefe13b28084ffcc8f10a96b3c13c59449dbf6fc371c006d129630ea0ce767a";
     };
     propagatedBuildInputs = [ DigestHMAC ];
     makeMakerFlags = "--noonline-tests";