diff --git a/pkgs/servers/dns/knot-resolver/default.nix b/pkgs/servers/dns/knot-resolver/default.nix
index 323b0b500008..24960eb65eff 100644
--- a/pkgs/servers/dns/knot-resolver/default.nix
+++ b/pkgs/servers/dns/knot-resolver/default.nix
@@ -10,11 +10,11 @@ let
 in
 stdenv.mkDerivation rec {
   name = "knot-resolver-${version}";
-  version = "1.2.2";
+  version = "1.2.3";
 
   src = fetchurl {
     url = "http://secure.nic.cz/files/knot-resolver/${name}.tar.xz";
-    sha256 = "89ab2ac8058b297c1f73f1c12e0f16d6e160aa86363e99ffa590bee7fe307931";
+    sha256 = "81a773f182112b4e11935223f900cfbcca8624f2c382b1e39a68d7c3db81c921";
   };
 
   outputs = [ "out" "dev" ];