diff --git a/package.json b/package.json
index 6077b9a..21c2329 100644
--- a/package.json
+++ b/package.json
@@ -11,25 +11,25 @@
   "main": "dist/lib/timestring.js",
   "version": "1.1.1",
   "devDependencies": {
-    "browserify": "^10.0.0",
-    "chai": "^2.3.0",
+    "browserify": "^12.0.1",
+    "chai": "^3.4.1",
     "codeclimate-test-reporter": "^0.1.0",
     "coveralls": "^2.11.2",
-    "del": "^1.1.1",
+    "del": "^2.2.0",
     "gulp": "^3.8.11",
-    "gulp-babel": "^5.1.0",
+    "gulp-babel": "^6.1.1",
     "gulp-concat": "^2.5.2",
-    "gulp-jscs": "^1.6.0",
-    "gulp-jshint": "^1.10.0",
-    "gulp-load-plugins": "^0.10.0",
+    "gulp-jscs": "^3.0.2",
+    "gulp-jshint": "^2.0.0",
+    "gulp-load-plugins": "^1.2.0",
     "gulp-mocha": "^2.0.1",
     "gulp-rename": "^1.2.2",
     "gulp-sourcemaps": "^1.5.2",
     "gulp-uglify": "^1.2.0",
-    "istanbul": "^0.3.13",
-    "jshint-stylish": "^1.0.1",
+    "istanbul": "^0.4.1",
+    "jshint-stylish": "^2.1.0",
     "mocha": "^2.2.4",
-    "mocha-lcov-reporter": "0.0.2",
+    "mocha-lcov-reporter": "1.0.0",
     "run-sequence": "^1.1.0",
     "vinyl-source-stream": "^1.1.0"
   }