diff --git a/.mocharc.json b/.mocharc.json
index 84fb9a4..c8b1580 100644
--- a/.mocharc.json
+++ b/.mocharc.json
@@ -1,6 +1,6 @@
 {
   "reporter": "spec",
   "ui": "bdd",
-  "require": "coffee-script/register",
+  "require": "coffeescript/register",
   "extension": ["coffee"]
 }
diff --git a/gulpfile.coffee b/gulpfile.coffee
index e8713f2..42a6e6d 100644
--- a/gulpfile.coffee
+++ b/gulpfile.coffee
@@ -3,10 +3,6 @@ peg     = require 'gulp-peg'
 webpack = require 'gulp-webpack'
 rename  = require 'gulp-rename'
 
-gulp.task 'default', ['build']
-
-gulp.task 'build', ['peg', 'webpack']
-
 gulp.task 'peg', ->
   gulp
     .src('src/tag-data.peg')
@@ -19,3 +15,8 @@ gulp.task 'webpack', ->
     .src('src/index.js')
     .pipe(webpack(require('./webpack.config')))
     .pipe(gulp.dest('./'))
+
+# webpack bundles dist/parser.js, so peg has to finish first
+gulp.task 'build', gulp.series('peg', 'webpack')
+
+gulp.task 'default', gulp.series('build')
diff --git a/package.json b/package.json
index b28c92f..1832d84 100644
--- a/package.json
+++ b/package.json
@@ -19,9 +19,9 @@
   },
   "devDependencies": {
     "chai": "^6.3.0",
-    "coffee-script": "^1.9.0",
+    "coffeescript": "^2.7.0",
     "exports-loader": "^0.6.2",
-    "gulp": "^3.8.11",
+    "gulp": "^5.0.1",
     "gulp-peg": "^0.1.2",
     "gulp-rename": "^2.1.0",
     "gulp-webpack": "^1.3.0",