diff --git a/.travis.yml b/.travis.yml
index f75a771..ab9d5a2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,7 +8,6 @@ node_js:
   - '9'
   - '8'
   - '6'
-  - '4'
 after_success:
   - npm run semantic-release
 branches:
diff --git a/package.json b/package.json
index 344c73f..7940807 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
   },
   "license": "MIT",
   "engines": {
-    "node": ">=4.0.0"
+    "node": ">=6.0.0"
   },
   "devDependencies": {
     "@types/jest": "^19.2.4",