diff --git a/.travis.yml b/.travis.yml
index e32a325..f2dff56 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,4 @@
 language: node_js
 node_js:
   - "node"
-  - "8"
+  - "11"
diff --git a/package.json b/package.json
index 9d01854..ff6033d 100644
--- a/package.json
+++ b/package.json
@@ -5,6 +5,9 @@
   "main": "dist/formulate.umd.js",
   "module": "dist/formulate.esm.js",
   "unpkg": "dist/formulate.min.js",
+  "engines": {
+    "node": ">=11"
+  },
   "browser": {
     "./sfc": "src/Formulate.js"
   },