diff --git a/pkgs/servers/dns/knot-dns/default.nix b/pkgs/servers/dns/knot-dns/default.nix
index f1ae382aa38..d9b47e06ae4 100644
--- a/pkgs/servers/dns/knot-dns/default.nix
+++ b/pkgs/servers/dns/knot-dns/default.nix
@@ -7,11 +7,11 @@ let inherit (stdenv.lib) optional optionals; in
 # Note: ATM only the libraries have been tested in nixpkgs.
 stdenv.mkDerivation rec {
   name = "knot-dns-${version}";
-  version = "2.5.2";
+  version = "2.5.3";
 
   src = fetchurl {
     url = "http://secure.nic.cz/files/knot-dns/knot-${version}.tar.xz";
-    sha256 = "286671a4ee35a5207b2e45fd0812962b481b1b543bf3d5df3a8c319c26e2f5e9";
+    sha256 = "d78ae231a68ace264f5738c8e57481923bcad7413f3f440c06fa6cc0aded9d8e";
   };
 
   outputs = [ "bin" "out" "dev" ];