diff --git a/.eslintrc.json b/.eslintrc.json
index 8f2880e9..1d5a4c5f 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -14,7 +14,7 @@
     "no-var": "off",
     "prefer-const": "off",
     "prefer-arrow-callback": "off",
-    "node/no-unsupported-features": ["error", {"version": 4}],
+    "node/no-unsupported-features": ["error", {"version": 8}],
     "func-names": ["error", "always"],
     "prefer-template": "error",
     "object-shorthand": [
diff --git a/.travis.yml b/.travis.yml
index e3f972fa..6d46cb1c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,10 +7,9 @@ branches:
     - master
 matrix:
   include:
-    - node_js: "4"
-    - node_js: "6"
     - node_js: "8"
-      after_success: "bash <(curl -s https://codecov.io/bash)"
     - node_js: "10"
+      after_success: "bash <(curl -s https://codecov.io/bash)"
+    - node_js: "12"
 install:
   - yarn install --frozen-lockfile
diff --git a/CHANGELOG.md b/CHANGELOG.md
index b8563ff4..01fe9e44 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## HEAD
+
+- **Breaking change:** Remove support for Node 4 and 6. Requires Node 8+.
+
 ## 5.2.1
 
 - Chore: Upgrade `js-yaml` to avoid npm audit warning.
diff --git a/README.md b/README.md
index 011fc36d..3f213c5c 100644
--- a/README.md
+++ b/README.md
@@ -63,7 +63,7 @@ If you are still using v4, those v4 docs are available [in the `4.0.0` tag](http
 npm install cosmiconfig
 ```
 
-Tested in Node 4+.
+Tested in Node 8+.
 
 ## Usage
 
diff --git a/appveyor.yml b/appveyor.yml
index 25b6f4de..01db252e 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,12 +1,5 @@
 # http://www.appveyor.com/docs/appveyor-yml
 
-environment:
-  matrix:
-    - nodejs_version: 4
-    - nodejs_version: 6
-    - nodejs_version: 8
-    - nodejs_version: 10
-
 branches:
   only:
     - master
@@ -19,8 +12,15 @@ deploy: off
 cache:
  - "%LOCALAPPDATA%\\Yarn"
 
+environment:
+  matrix:
+  - nodejs_version: 8
+  - nodejs_version: 10
+  - nodejs_version: 12
+
 install:
-  - ps: Install-Product node $env:nodejs_version x64
+  # https://www.appveyor.com/docs/lang/nodejs-iojs/#installing-any-version-of-nodejs-or-iojs
+  - ps: Update-NodeJsInstallation (Get-NodeJsLatestBuild $env:nodejs_version) x64
   - yarn install --frozen-lockfile
 
 test_script:
diff --git a/package.json b/package.json
index 545bb95e..109df250 100644
--- a/package.json
+++ b/package.json
@@ -109,6 +109,6 @@
     "remark-preset-davidtheclark": "^0.7.0"
   },
   "engines": {
-    "node": ">=4"
+    "node": ">=8"
   }
 }