diff --git a/appveyor.yml b/.appveyor.yml
similarity index 90%
rename from appveyor.yml
rename to .appveyor.yml
index f2d6c6b..c219e44 100644
--- a/appveyor.yml
+++ b/.appveyor.yml
@@ -3,7 +3,6 @@ environment:
     - nodejs_version: '9'
     - nodejs_version: '8'
     - nodejs_version: '6'
-    - nodejs_version: '4'
 install:
   - ps: Install-Product node $env:nodejs_version
   - npm install
diff --git a/.travis.yml b/.travis.yml
index a6c33a0..6e43c6e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,5 @@
 language: node_js
 node_js:
-  - 4
   - 6
   - 8
   - 9
diff --git a/package.json b/package.json
index d1a831e..b4d650f 100644
--- a/package.json
+++ b/package.json
@@ -44,5 +44,8 @@
   ],
   "publishConfig": {
     "access": "public"
+  },
+  "engines": {
+    "node": ">= 6.0.0"
   }
 }