diff --git a/pkgs/tools/networking/unbound/default.nix b/pkgs/tools/networking/unbound/default.nix
index 684b9b13a804..1443c9bfb7d7 100644
--- a/pkgs/tools/networking/unbound/default.nix
+++ b/pkgs/tools/networking/unbound/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   name = "unbound-${version}";
-  version = "1.5.8";
+  version = "1.5.9";
 
   src = fetchurl {
     url = "http://unbound.net/downloads/${name}.tar.gz";
-    sha256 = "33567a20f73e288f8daa4ec021fbb30fe1824b346b34f12677ad77899ecd09be";
+    sha256 = "01328cfac99ab5b8c47115151896a244979e442e284eb962c0ea84b7782b6990";
   };
 
   outputs = [ "out" "lib" "man" ]; # "dev" would only split ~20 kB