diff --git a/pkgs/servers/dns/knot-dns/default.nix b/pkgs/servers/dns/knot-dns/default.nix
index 12239f2f10df..e3926fe4947d 100644
--- a/pkgs/servers/dns/knot-dns/default.nix
+++ b/pkgs/servers/dns/knot-dns/default.nix
@@ -1,17 +1,18 @@
 { lib, stdenv, fetchurl, pkg-config, gnutls, liburcu, lmdb, libcap_ng, libidn2, libunistring
 , systemd, nettle, libedit, zlib, libiconv, libintl, libmaxminddb, libbpf, nghttp2, libmnl
 , ngtcp2-gnutls, xdp-tools
+, sphinx
 , autoreconfHook
 , nixosTests, knot-resolver, knot-dns, runCommandLocal
 }:
 
 stdenv.mkDerivation rec {
   pname = "knot-dns";
-  version = "3.3.9";
+  version = "3.4.0";
 
   src = fetchurl {
     url = "https://secure.nic.cz/files/knot-dns/knot-${version}.tar.xz";
-    sha256 = "7cf2bd93bf487179aca1d2acf7b462dc269e769944c3ea73c7f9a4570dde86ab";
+    sha256 = "2730b11398944faa5151c51b0655cf26631090343c303597814f2a57df424736";
   };
 
   outputs = [ "bin" "out" "dev" ];
@@ -29,7 +30,8 @@ stdenv.mkDerivation rec {
     ./runtime-deps.patch
   ];
 
-  nativeBuildInputs = [ pkg-config autoreconfHook ];
+  # FIXME: sphinx is needed for now to get man-pages
+  nativeBuildInputs = [ pkg-config autoreconfHook sphinx ];
   buildInputs = [
     gnutls liburcu libidn2 libunistring
     nettle libedit
diff --git a/pkgs/servers/dns/knot-dns/runtime-deps.patch b/pkgs/servers/dns/knot-dns/runtime-deps.patch
index 19fc9cd07b18..89dba415b3b9 100644
--- a/pkgs/servers/dns/knot-dns/runtime-deps.patch
+++ b/pkgs/servers/dns/knot-dns/runtime-deps.patch
@@ -5,10 +5,9 @@ but that contains also references like include paths.
 Filter these at least in a crude way (whole lines).
 --- a/configure.ac
 +++ b/configure.ac
-@@ -766,5 +766,5 @@ result_msg_base="  Knot DNS $VERSION
- 
--result_msg_esc=$(echo -n "$result_msg_base" | sed '$!s/$/\\n/' | tr -d '\n')
-+result_msg_esc=$(echo -n "$result_msg_base" | grep -Fv "$NIX_STORE" | sed '$!s/$/\\n/' | tr -d '\n')
+@@ -788,5 +788,5 @@ result_msg_base="
+-result_msg_esc=$(echo -n "    Configure:$filtered_config_params\n$result_msg_base" | sed '$!s/$/\\n/' | tr -d '\n')
++result_msg_esc=$(echo -n "    Configure:$filtered_config_params\n$result_msg_base" | grep -Fv "$NIX_STORE" | sed '$!s/$/\\n/' | tr -d '\n')
  
  AC_DEFINE_UNQUOTED([CONFIGURE_SUMMARY],["$result_msg_esc"],[Configure summary])