diff --git a/.babelrc b/.babelrc
index 86a1a91..0558174 100644
--- a/.babelrc
+++ b/.babelrc
@@ -1,4 +1,3 @@
 {
-  stage: "1",
-  loose: "all"
+  "presets": ["es2015", "stage-2"]
 }
diff --git a/lib/is.js b/lib/is.js
index 0e3eb6d..2551245 100644
--- a/lib/is.js
+++ b/lib/is.js
@@ -5,9 +5,9 @@ function is(path, predicate, object) {
   const parts = splitPath(path);
 
   let rest = object;
-  let part;
-  for (part of parts) {
+  for (let i = 0; i < parts.length; ++i) {
     if (typeof rest === 'undefined') return false;
+    const part = parts[i];
     rest = rest[part];
   }
 
diff --git a/lib/util/curry.js b/lib/util/curry.js
index 2f9157c..cc3f952 100644
--- a/lib/util/curry.js
+++ b/lib/util/curry.js
@@ -13,7 +13,8 @@ function countArguments(args, max) {
 }
 
 export function curry1(fn) {
-  return function curried(a, ...[b, c]) {
+  return function curried(a, ...args) {
+    const [b, c] = args;
     const n = countArguments(arguments);
 
     if (n >= 1) return fn(a, b, c);
@@ -22,7 +23,8 @@ export function curry1(fn) {
 }
 
 export function curry2(fn) {
-  return function curried(a, b, ...[c, d]) {
+  return function curried(a, b, ...args) {
+    const [c, d] = args;
     const n = countArguments(arguments, 2);
 
     if (b === _ || c === _ || d === _) {
@@ -40,7 +42,8 @@ export function curry2(fn) {
 }
 
 export function curry3(fn) {
-  return function curried(a, b, c, ...[d, e]) {
+  return function curried(a, b, c, ...args) {
+    const [d, e] = args;
     const n = countArguments(arguments, 3);
 
     if (c === _ || d === _ || e === _) {
@@ -68,7 +71,8 @@ export function curry3(fn) {
 }
 
 export function curry4(fn) {
-  return function curried(a, b, c, d, ...[e, f]) {
+  return function curried(a, b, c, d, ...args) {
+    const [e, f] = args;
     const n = countArguments(arguments, 4);
 
     if (d === _ || e === _ || f === _) {
diff --git a/package.json b/package.json
index 0ed7c4d..d44867a 100644
--- a/package.json
+++ b/package.json
@@ -32,22 +32,22 @@
     "lodash": "^3.0.0"
   },
   "devDependencies": {
-    "babel": "^5.8.21",
-    "babel-core": "^5.5.0",
-    "babel-eslint": "^4.0.5",
-    "babel-loader": "^5.3.2",
+    "babel-core": "^6.4.0",
+    "babel-loader": "^6.2.1",
+    "babel-preset-es2015": "^6.3.13",
+    "babel-preset-stage-2": "^6.3.13",
     "benchmark": "^1.0.0",
     "chai": "^3.2.0",
     "eslint": "^0.24.1",
     "eslint-config-airbnb": "0.0.7",
     "exports-loader": "^0.6.2",
     "gulp": "^3.6.0",
-    "gulp-babel": "^5.1.0",
+    "gulp-babel": "^6.1.1",
     "gulp-eslint": "^0.15.0",
     "gulp-mocha": "^2.0.0",
     "gulp-nsp": "^2.0.0",
     "karma": "^0.13.3",
-    "karma-babel-preprocessor": "^5.2.1",
+    "karma-babel-preprocessor": "^6.0.1",
     "karma-chrome-launcher": "^0.2.0",
     "karma-mocha": "^0.2.0",
     "karma-mocha-reporter": "^1.0.4",