diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3d25317..4f9b386 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [4.x, 6.x, 8.x, 9.x, 10.x, 11.x, 12.x]
+        node-version: [6.x, 8.x, 9.x, 10.x, 11.x, 12.x]
 
     steps:
     - uses: actions/checkout@v1
diff --git a/package.json b/package.json
index efe5f82..4b14776 100644
--- a/package.json
+++ b/package.json
@@ -5,6 +5,9 @@
   "version": "1.1.4",
   "author": "Alessandro Maclaine <almaclaine@gmail.com>",
   "main": "replace.js",
+  "engines": {
+    "node": ">= 6"
+  },
   "repository": {
     "type": "git",
     "url": "https://github.com/ALMaclaine/replace"