diff --git a/pkgs/development/libraries/libidn/default.nix b/pkgs/development/libraries/libidn/default.nix
index b16dc8357414..d1abf155ae3a 100644
--- a/pkgs/development/libraries/libidn/default.nix
+++ b/pkgs/development/libraries/libidn/default.nix
@@ -1,11 +1,11 @@
 { fetchurl, stdenv, libiconv }:
 
 stdenv.mkDerivation rec {
-  name = "libidn-1.32";
+  name = "libidn-1.33";
 
   src = fetchurl {
     url = "mirror://gnu/libidn/${name}.tar.gz";
-    sha256 = "1xf4hphhahcjm2xwx147lfpsavjwv9l4c2gf6hx71zxywbz5lpds";
+    sha256 = "068fjg2arlppjqqpzd714n1lf6gxkpac9v5yyvp1qwmv6nvam9s4";
   };
 
   outputs = [ "dev" "out" "bin" "info" "docdev" ];