diff --git a/pkgs/tools/networking/unbound/python.nix b/pkgs/tools/networking/unbound/python.nix
index c20169d39135..f41aa35df90e 100644
--- a/pkgs/tools/networking/unbound/python.nix
+++ b/pkgs/tools/networking/unbound/python.nix
@@ -5,7 +5,7 @@ let
 in stdenv.mkDerivation rec {
   pname = "pyunbound";
   name = "${pname}-${version}";
-  version = "1.7.3";
+  version = "1.9.0";
 
   src = fetchurl {
     url = "http://unbound.net/downloads/unbound-${version}.tar.gz";