diff --git a/.eslintrc b/.eslintrc
index 2f38162..1e521a5 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -2,6 +2,7 @@
   "extends": "./node_modules/wealthfront-javascript/.eslintrc",
   "parser": "babel-eslint",
   "env": {
-    "node": true
+    "node": true,
+    "es6": true
   }
 }
diff --git a/package.json b/package.json
index f7b3fd1..8b677b6 100644
--- a/package.json
+++ b/package.json
@@ -16,14 +16,14 @@
   },
   "devDependencies": {
     "babel-cli": "6.6.5",
-    "babel-eslint": "5.0.0",
+    "babel-eslint": "6.0.2",
     "babel-preset-es2015": "6.6.0",
     "babel-register": "^6.7.2",
     "chai": "3.5.0",
-    "eslint": "1.10.3",
-    "jscs": "2.9.0",
-    "mocha": "2.3.4",
-    "wealthfront-javascript": "2.4.0"
+    "eslint": "2.6.0",
+    "jscs": "2.11.0",
+    "mocha": "2.4.5",
+    "wealthfront-javascript": "2.4.1"
   },
   "repository": {
     "type": "git",
diff --git a/src/index.js b/src/index.js
index 68177a5..c50d929 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,5 +1,3 @@
-'use strict';
-
 const CleanGitRef = {
   clean(value) {
     if (typeof value !== 'string') {
diff --git a/test/js/setup.js b/test/js/setup.js
index 7f519d9..fda9583 100644
--- a/test/js/setup.js
+++ b/test/js/setup.js
@@ -1,5 +1,3 @@
-'use strict';
-
 var chai = require('chai');
 
 chai.config.includeStack = true;
diff --git a/test/src-test/index_test.js b/test/src-test/index_test.js
index 3bc5eb8..7f4b87a 100644
--- a/test/src-test/index_test.js
+++ b/test/src-test/index_test.js
@@ -1,5 +1,3 @@
-'use strict';
-
 const assert = require('chai').assert;
 const spawn = require('child_process').spawn;
 const cleanGitRef = require('../../src/index');