diff --git a/pkgs/servers/dns/knot-dns/default.nix b/pkgs/servers/dns/knot-dns/default.nix
index 94d5ee9f5c71..1174f5badba0 100644
--- a/pkgs/servers/dns/knot-dns/default.nix
+++ b/pkgs/servers/dns/knot-dns/default.nix
@@ -7,11 +7,11 @@ with { inherit (stdenv.lib) optional optionals; };
 # Note: ATM only the libraries have been tested in nixpkgs.
 stdenv.mkDerivation rec {
   name = "knot-dns-${version}";
-  version = "2.4.1";
+  version = "2.4.2";
 
   src = fetchurl {
     url = "http://secure.nic.cz/files/knot-dns/knot-${version}.tar.xz";
-    sha256 = "c064ddf99bf5fc24dd3c6a3a523394760357e204c8b69f0e691e49bc0d9b704c";
+    sha256 = "37da7fcf1f194bd6376c63d8c4fa28a21899b56a3f3b63dba7095740a5752c52";
   };
 
   outputs = [ "bin" "out" "dev" ];