diff --git a/pkgs/by-name/kn/knot-dns/package.nix b/pkgs/by-name/kn/knot-dns/package.nix
index 76486a655421..c3c7743e0aa2 100644
--- a/pkgs/by-name/kn/knot-dns/package.nix
+++ b/pkgs/by-name/kn/knot-dns/package.nix
@@ -34,11 +34,11 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "knot-dns";
-  version = "3.5.5";
+  version = "3.5.6";
 
   src = fetchurl {
     url = "https://secure.nic.cz/files/knot-dns/knot-${finalAttrs.version}.tar.xz";
-    sha256 = "38502c1472247c955aa3329bb5722e61ca765b833e3497d71f891ebf8e77fa04";
+    sha256 = "8e2dde44c97f8a63ec5e6c11db26099acd5341286af5b6be900b62ccade68898";
   };
 
   outputs = [