diff --git a/.travis.yml b/.travis.yml
index 0620f9a2..ab615355 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,11 +6,6 @@ node_js:
 - '8'
 - '7'
 - '6'
-- '5'
-- '4'
-before_install:
-# https://github.com/npm/npm/issues/11283
-- npm set progress=false
 after_success: npm run coveralls
 env:
   global:
diff --git a/package.json b/package.json
index 4cb71bc9..a0a17eb1 100644
--- a/package.json
+++ b/package.json
@@ -65,7 +65,7 @@
     "micromatch": "^3.1.10"
   },
   "engines": {
-    "node": ">=4.0.0"
+    "node": ">=6.0.0"
   },
   "husky": {
     "hooks": {