diff --git a/esnext.js b/esnext.js
index e777265..a09863a 100644
--- a/esnext.js
+++ b/esnext.js
@@ -30,8 +30,10 @@ def.ecmaFeatures = {
 def.env.es6 = true;
 def.rules['no-var'] = 2;
 def.rules['object-shorthand'] = [2, 'always'];
+def.rules['prefer-arrow-callback'] = 2;
 def.rules['prefer-const'] = 2;
-def.rules['prefer-reflect'] = 2;
+def.rules['prefer-reflect'] = [2, {exceptions: ['delete']}];
+def.rules['prefer-template'] = 2;
 def.rules['prefer-spread'] = 2;
 
 module.exports = def;
diff --git a/index.js b/index.js
index c53f9d2..9c23010 100644
--- a/index.js
+++ b/index.js
@@ -170,6 +170,7 @@ module.exports = {
 		'generator-star-spacing': [2, 'before'],
 		'no-class-assign': 2,
 		'no-const-assign': 2,
+		'no-dupe-class-members': 2,
 		'no-this-before-super': 2
 	}
 };
diff --git a/package.json b/package.json
index 96a7a9c..3bad7ca 100644
--- a/package.json
+++ b/package.json
@@ -51,11 +51,11 @@
   "devDependencies": {
     "ava": "0.0.4",
     "clear-require": "^1.0.1",
-    "eslint": "^1.1.0",
+    "eslint": "^1.2.0",
     "is-plain-obj": "^1.0.0",
     "temp-write": "^1.1.2"
   },
   "peerDependencies": {
-    "eslint": ">=1.1.0"
+    "eslint": ">=1.2.0"
   }
 }