diff --git a/.eslintrc b/.eslintrc
index 6aea48e..ddf5c66 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -1,126 +1,22 @@
 {
-  "rules": {
-    "space-before-function-paren": [2, { "named": "never" }],
-    "no-shadow-restricted-names":  [2],
-    "computed-property-spacing":   [2],
-    "no-empty-character-class":    [2],
-    "no-irregular-whitespace":     [2],
-    "no-unexpected-multiline":     [2],
-    "no-multiple-empty-lines":     [2],
-    "space-return-throw-case":     [2],
-    "no-constant-condition":       [2],
-    "no-extra-boolean-cast":       [2],
-    "no-inner-declarations":       [2],
-    "no-this-before-super":        [2],
-    "no-use-before-define":        [2],
-    "no-array-constructor":        [2],
-    "object-curly-spacing":        [2, "always"],
-    "no-floating-decimal":         [2],
-    "no-warning-comments":         [2],
-    "handle-callback-err":         [2],
-    "no-unneeded-ternary":         [2],
-    "operator-assignment":         [2],
-    "space-before-blocks":         [2],
-    "no-native-reassign":          [2],
-    "no-trailing-spaces":          [2],
-    "operator-linebreak":          [2, "after"],
-    "consistent-return":           [2],
-    "no-duplicate-case":           [2],
-    "no-invalid-regexp":           [2],
-    "no-negated-in-lhs":           [2],
-    "constructor-super":           [2],
-    "no-nested-ternary":           [2],
-    "no-extend-native":            [2],
-    "block-scoped-var":            [2],
-    "no-control-regex":            [2],
-    "no-sparse-arrays":            [2],
-    "no-throw-literal":            [2],
-    "no-return-assign":            [2],
-    "no-const-assign":             [2],
-    "no-class-assign":             [2],
-    "no-extra-parens":             [2],
-    "no-regex-spaces":             [2],
-    "no-implied-eval":             [2],
-    "no-useless-call":             [2],
-    "no-self-compare":             [2],
-    "no-octal-escape":             [2],
-    "no-new-wrappers":             [2],
-    "no-process-exit":             [2],
-    "no-catch-shadow":             [2],
-    "linebreak-style":             [2],
-    "space-infix-ops":             [2],
-    "space-unary-ops":             [2],
-    "no-cond-assign":              [2],
-    "no-func-assign":              [2],
-    "no-unreachable":              [2],
-    "accessor-pairs":              [2],
-    "no-empty-label":              [2],
-    "no-fallthrough":              [2],
-    "no-path-concat":              [2],
-    "no-new-require":              [2],
-    "no-spaced-func":              [2],
-    "no-unused-vars":              [2],
-    "spaced-comment":              [2],
-    "no-delete-var":               [2],
-    "comma-spacing":               [2],
-    "no-extra-semi":               [2],
-    "no-extra-bind":               [2],
-    "arrow-spacing":               [2],
-    "prefer-spread":               [2],
-    "no-new-object":               [2],
-    "no-multi-str":                [2],
-    "semi-spacing":                [2],
-    "no-lonely-if":                [2],
-    "dot-notation":                [2],
-    "dot-location":                [2, "property"],
-    "comma-dangle":                [2, "never"],
-    "no-dupe-args":                [2],
-    "no-dupe-keys":                [2],
-    "no-ex-assign":                [2],
-    "no-obj-calls":                [2],
-    "valid-typeof":                [2],
-    "default-case":                [2],
-    "no-redeclare":                [2],
-    "no-div-regex":                [2],
-    "no-sequences":                [2],
-    "no-label-var":                [2],
-    "comma-style":                 [2],
-    "brace-style":                 [2],
-    "no-debugger":                 [2],
-    "quote-props":                 [2, "consistent-as-needed"],
-    "no-iterator":                 [2],
-    "no-new-func":                 [2],
-    "key-spacing":                 [2, {"beforeColon": false, "afterColon": true}],
-    "complexity":                  [2],
-    "new-parens":                  [2],
-    "no-eq-null":                  [2],
-    "no-bitwise":                  [2],
-    "wrap-iife":                   [2],
-    "no-caller":                   [2],
-    "use-isnan":                   [2],
-    "no-labels":                   [2],
-    "no-shadow":                   [2],
-    "camelcase":                   [2],
-    "eol-last":                    [2],
-    "no-octal":                    [2],
-    "no-empty":                    [2],
-    "no-alert":                    [2],
-    "no-proto":                    [2],
-    "no-undef":                    [2],
-    "no-eval":                     [2],
-    "no-with":                     [2],
-    "no-void":                     [2],
-    "max-len":                     [2, 120],
-    "new-cap":                     [2],
-    "eqeqeq":                      [2],
-    "no-new":                      [2],
-    "quotes":                      [2, "single"],
-    "indent":                      [2, 4],
-    "semi":                        [2, "always"],
-    "yoda":                        [2, "never"]
-  },
-  "env": {
-    "mocha": true,
-    "node":  true
-  }
+    "rules": {
+        "no-unused-expressions": [0],
+        "no-underscore-dangle":  [0],
+        "quote-props":           [2, "as-needed"],
+        "no-multi-spaces":       [0],
+        "no-extra-parens":       [2],
+        "no-unused-vars":        [2],
+        "no-loop-func":          [0],
+        "key-spacing":           [0],
+        "no-shadow":             [0],
+        "max-len":               [2, 120],
+        "strict":                [0],
+        "indent":                [2],
+        "quotes":                [2, "single", "avoid-escape"],
+        "curly":                 [0]
+    },
+    "env": {
+        "mocha": true,
+        "node":  true
+    }
 }
diff --git a/.travis.yml b/.travis.yml
index b846b42..6f0930a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 sudo: false
 language: node_js
 node_js:
-  - stable
   - "4"
-  - "0.12"
+  - "6"
+  - "node"
 after_script: "npm run coveralls"
diff --git a/package.json b/package.json
index 6f370fe..16e0da4 100644
--- a/package.json
+++ b/package.json
@@ -19,15 +19,15 @@
   "homepage": "https://github.com/yuezk/postcss-filter-gradient",
   "dependencies": {
     "filter-gradient": "^1.0.1",
-    "postcss": "^5.0.2"
+    "postcss": "^6.0.0"
   },
   "devDependencies": {
-    "chai": "^3.2.0",
-    "coveralls": "^2.11.12",
-    "gulp": "^3.9.0",
-    "gulp-eslint": "^1.0.0",
-    "gulp-mocha": "^2.1.3",
-    "istanbul": "^0.4.4",
+    "chai": "^3.5.0",
+    "coveralls": "^2.13.1",
+    "gulp": "^3.9.1",
+    "gulp-eslint": "^1.1.1",
+    "gulp-mocha": "^2.2.0",
+    "istanbul": "^0.4.5",
     "mocha": "^2.5.3"
   },
   "scripts": {