diff --git a/.eslintrc b/.eslintrc
index ea875f9..d1d7c09 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -1,23 +1,24 @@
 {
-	"root": true,
-	"rules": {
-		"indent": [ 2, "tab", { "SwitchCase": 1 } ],
-		"quotes": [ 2, "single" ],
-		"semi": [ 2, "always" ],
-		"space-after-keywords": [ 2, "always" ],
-		"space-before-blocks": [ 2, "always" ],
-		"space-before-function-paren": [ 2, "always" ],
-		"no-mixed-spaces-and-tabs": [ 2, "smart-tabs" ],
-		"no-cond-assign": [ 0 ]
-	},
-	"env": {
-		"es6": true,
-		"browser": true,
-		"mocha": true,
-		"node": true
-	},
-	"extends": "eslint:recommended",
-	"ecmaFeatures": {
-		"modules": true
-	}
+    "root": true,
+    "rules": {
+        "indent": [ 2, "tab", { "SwitchCase": 1 } ],
+        "quotes": [ 2, "single" ],
+        "semi": [ 2, "always" ],
+        "space-after-keywords": [ 2, "always" ],
+        "space-before-blocks": [ 2, "always" ],
+        "space-before-function-paren": [ 2, "always" ],
+        "no-mixed-spaces-and-tabs": [ 2, "smart-tabs" ],
+        "no-cond-assign": [ 0 ]
+    },
+    "env": {
+        "es6": true,
+        "browser": true,
+        "mocha": true,
+        "node": true
+    },
+    "extends": "eslint:recommended",
+    "parserOptions": {
+        "ecmaVersion": 6,
+        "sourceType": "module"
+    }
 }
diff --git a/package.json b/package.json
index 87d776e..4e00158 100644
--- a/package.json
+++ b/package.json
@@ -40,23 +40,23 @@
   },
   "homepage": "https://github.com/rollup/rollup",
   "devDependencies": {
-    "acorn": "^2.6.4",
+    "acorn": "^3.1.0",
     "babel-core": "^5.8.32",
     "buble": "^0.6.4",
     "codecov.io": "^0.1.6",
     "console-group": "^0.2.0",
     "es6-promise": "^3.0.2",
-    "eslint": "^1.7.1",
+    "eslint": "^2.9.0",
     "estree-walker": "^0.2.0",
     "istanbul": "^0.4.0",
     "magic-string": "^0.10.1",
     "mocha": "^2.3.3",
     "remap-istanbul": "^0.5.1",
-    "rollup": "^0.20.2",
-    "rollup-plugin-buble": "^0.5.0",
+    "rollup": "^0.26.2",
+    "rollup-plugin-buble": "^0.6.0",
     "rollup-plugin-node-resolve": "^1.5.0",
     "rollup-plugin-replace": "^1.0.1",
-    "sander": "^0.4.0",
+    "sander": "^0.5.0",
     "source-map": "^0.5.3",
     "sourcemap-codec": "^1.2.1",
     "uglify-js": "^2.6.1"