diff --git a/pkgs/tools/text/ascii/default.nix b/pkgs/tools/text/ascii/default.nix
index 4cc03393855..20777f990e2 100644
--- a/pkgs/tools/text/ascii/default.nix
+++ b/pkgs/tools/text/ascii/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   name = "ascii-${version}";
-  version = "3.15";
+  version = "3.18";
 
   src = fetchurl {
     url = "http://www.catb.org/~esr/ascii/${name}.tar.gz";
-    sha256 = "0pzzfljg2ijnnys3fzj3f2p288sl5cgk83a2mpcm679pcj5xpqdc";
+    sha256 = "0b87vy06s8s3a8q70pqavsbk4m4ff034sdml2xxa6qfsykaj513j";
   };
 
   prePatch = ''