diff --git a/nix/nixpkgs.json b/nix/nixpkgs.json
index f0e97b4..f63ecf2 100644
--- a/nix/nixpkgs.json
+++ b/nix/nixpkgs.json
@@ -1,7 +1,7 @@
 {
   "url": "https://github.com/nixos/nixpkgs-channels.git",
-  "rev": "2e855dc6b0cd88767a8a5df2faff9e66e1cd7f18",
-  "date": "2018-04-11T10:16:39+08:00",
-  "sha256": "08s6mfh5a05kd2qs3hmza50ng3pyhd3qha4nanwwk0s8fjzqnv4a",
+  "rev": "4477cf04b6779a537cdb5f0bd3dd30e75aeb4a3b",
+  "date": "2018-08-31T21:37:07-04:00",
+  "sha256": "1i39wsfwkvj9yryj8di3jibpdg3b3j86ych7s9rb6z79k08yaaxc",
   "fetchSubmodules": true
 }