diff --git a/pkgs/development/tools/misc/arcanist/default.nix b/pkgs/development/tools/misc/arcanist/default.nix
index 15b8f82d0ab2..f6ff4ad3650d 100644
--- a/pkgs/development/tools/misc/arcanist/default.nix
+++ b/pkgs/development/tools/misc/arcanist/default.nix
@@ -4,19 +4,19 @@ let
   libphutil = fetchFromGitHub {
     owner = "phacility";
     repo = "libphutil";
-    rev = "01b33af6f4d570b34ad791cd5ccaa3ea7f77dcb9";
-    sha256 = "0glrxlj4cr2821pdc2yy2m5bss4yr1zx3sdgw3r5d8hbfz361nx7";
+    rev = "3215e4e291ed4468faeed4542d47a571b5bc559a";
+    sha256 = "0bbinaxny0j4iniz2grf0s9cysbl3x24yc32f3jra9mwsgh2v2zj";
   };
   arcanist = fetchFromGitHub {
     owner = "phacility";
     repo = "arcanist";
-    rev = "3b6b523c2b236e3724a1e115f126cb6fd05fa128";
-    sha256 = "1pr2izwj446rf2v6x6v2wsj7iwnaxq3xg3qqipybyf1xpqfmh5q8";
+    rev = "2650e8627a20e1bfe334a4a2b787f44ef5d6ebc5";
+    sha256 = "0x0xxiar202ypbgxh19swzjil546bbp8li4k5yrpvab55y8ymkd4";
   };
 in
 stdenv.mkDerivation rec {
   name    = "arcanist-${version}";
-  version = "20170323";
+  version = "20180916";
 
   src = [ arcanist libphutil ];
   buildInputs = [ php makeWrapper flex ];