diff --git a/pkgs/servers/dns/knot-dns/default.nix b/pkgs/servers/dns/knot-dns/default.nix
index 6e87ac5052c6..26d0217254a1 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 {
   pname = "knot-dns";
-  version = "2.9.0";
+  version = "2.9.1";
 
   src = fetchurl {
     url = "https://secure.nic.cz/files/knot-dns/knot-${version}.tar.xz";
-    sha256 = "df7434eaefbabbf7cca2d6cba5038be48a4668e508215ca197532bac7c9b21a2";
+    sha256 = "f19121956caa360c387923654f13e4c97b3fb9093d242e110d7e0916b8d8a04d";
   };
 
   outputs = [ "bin" "out" "dev" ];