diff --git a/pkgs/tools/text/uni2ascii/default.nix b/pkgs/tools/text/uni2ascii/default.nix
index b4573118a49f..0f54644eba56 100644
--- a/pkgs/tools/text/uni2ascii/default.nix
+++ b/pkgs/tools/text/uni2ascii/default.nix
@@ -1,10 +1,10 @@
 { stdenv, fetchurl }:
 
 stdenv.mkDerivation rec {
-  name = "uni2ascii-4.15";
+  name = "uni2ascii-4.18";
   src = fetchurl {
     url = "http://billposer.org/Software/Downloads/${name}.tar.gz";
-    sha256 = "0vlwsqrzmdsb2mx0hbhmw1dvzy56jk8779hphnj6yxijryva6g2v";
+    sha256 = "03lklnzr6ngs4wqiqa7rifd246f441gfvardbsaa5l6fn9pbn94y";
   };
 
   meta = {