diff --git a/pkgs/development/libraries/udns/default.nix b/pkgs/development/libraries/udns/default.nix
index 518ed432b723..27b60937752c 100644
--- a/pkgs/development/libraries/udns/default.nix
+++ b/pkgs/development/libraries/udns/default.nix
@@ -1,11 +1,11 @@
 { lib, stdenv, fetchurl }:
 
 # this expression is mostly based on debian's packaging
-# https://tracker.debian.org/media/packages/u/udns/rules-0.4-1
+# https://tracker.debian.org/media/packages/u/udns/rules-0.5-1
 
 stdenv.mkDerivation rec {
   pname = "udns";
-  version = "0.4";
+  version = "0.5";
 
   configurePhase = "./configure --enable-ipv6";
 
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "http://www.corpit.ru/mjt/udns/${pname}-${version}.tar.gz";
-    sha256 = "0447fv1hmb44nnchdn6p5pd9b44x8p5jn0ahw6crwbqsg7f0hl8i";
+    sha256 = "sha256-A1v8EuOBnQq6j0DugiCpdLfpspwyWdMQlwzEstHCA8A=";
   };
 
   # udns uses a very custom build and hardcodes a .so name in a few places.