diff --git a/pkgs/development/libraries/libidn/default.nix b/pkgs/development/libraries/libidn/default.nix
index 44aa546fe00d..4c781da63083 100644
--- a/pkgs/development/libraries/libidn/default.nix
+++ b/pkgs/development/libraries/libidn/default.nix
@@ -1,11 +1,11 @@
 { fetchurl, stdenv }:
 
 stdenv.mkDerivation rec {
-  name = "libidn-1.30";
+  name = "libidn-1.31";
 
   src = fetchurl {
     url = "mirror://gnu/libidn/${name}.tar.gz";
-    sha256 = "0lxh5r1z8gsk4jxx3rv8aasjv8p53j4y04kvfn2w30a0syagrf9r";
+    sha256 = "026z12mczlag443ms9n954h36pi3m7iva9jfw8y4ispsj772zpxg";
   };
 
   doCheck = ! stdenv.isDarwin;