diff --git a/.eslintrc.js b/.eslintrc.js
new file mode 100644
index 0000000..11ed0fa
--- /dev/null
+++ b/.eslintrc.js
@@ -0,0 +1,11 @@
+module.exports = {
+  env: {
+    es2023: true,
+    node: true,
+    mocha: true
+  },
+  extends: ['semistandard', 'eslint:recommended'],
+  rules: {
+    complexity: ['error', 13] // eventually get down to 10 or less
+  }
+};
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..a0fed21
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,23 @@
+
+name: Node.js CI
+on: push
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [20.x]
+    env:
+      NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm install
+      - name: Run tests
+        run: npx nyc@latest --reporter=lcov npm test
+      - uses: codecov/codecov-action@v4
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
diff --git a/.gitignore b/.gitignore
index 656402b..d8ef0ce 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 /lib-cov/
 /node_modules/
 /npm-debug.log
+.idea
diff --git a/.npmrc b/.npmrc
new file mode 100644
index 0000000..5015c5f
--- /dev/null
+++ b/.npmrc
@@ -0,0 +1,2 @@
+package-lock=false
+//registry.npmjs.org/:_authToken=${NPM_TOKEN}
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 2d26206..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,3 +0,0 @@
-language: node_js
-node_js:
-  - 0.6
diff --git a/lib/dotaccess.js b/lib/dotaccess.js
index bbfcfef..72fa88b 100644
--- a/lib/dotaccess.js
+++ b/lib/dotaccess.js
@@ -1,44 +1,40 @@
-module.exports.set = set
-module.exports.unset = unset
-module.exports.get = get
+module.exports.set = set;
+module.exports.unset = unset;
+module.exports.get = get;
 
-function parts(key) {
-  if (Array.isArray(key)) return key
-  return key.split('.')
+function parts (key) {
+  if (Array.isArray(key)) return key;
+  return key.split('.');
 }
 
-function lookup(obj, key) {
-  key = parts(key)
-  var lastKey = key.pop()
-  for (var i=0, l=key.length; i<l; i++) {
-    var part = key[i]
-    if (!(part in obj)) obj[part] = {}
-    obj = obj[part]
-    if (!obj) throw new Error('dotaccess: incompatible value in ' + part)
+function lookup (obj, key) {
+  key = parts(key);
+  const lastKey = key.pop();
+  for (let i = 0, l = key.length; i < l; i++) {
+    const part = key[i];
+    if (!(part in obj)) obj[part] = {};
+    obj = obj[part];
+    if (!obj) throw new Error('dotaccess: incompatible value in ' + part);
   }
   return [obj, lastKey];
 }
 
-function set(obj, key, value, overwrite) {
-  var objectAndKey = lookup(obj, key)
-    , obj = objectAndKey[0]
-    , key = objectAndKey[1];
-  if (overwrite || !(key in obj)) obj[key] = value
+function set (obj, key, value, overwrite) {
+  [obj, key] = lookup(obj, key);
+  if (overwrite || !(key in obj)) obj[key] = value;
 }
 
-function unset(obj, key) {
-  var objectAndKey = lookup(obj, key)
-    , obj = objectAndKey[0]
-    , key = objectAndKey[1];
+function unset (obj, key) {
+  [obj, key] = lookup(obj, key);
   return delete obj[key];
 }
 
-function get(obj, key, def) {
-  key = parts(key)
-  for (var i=0, l=key.length; i<l; i++) {
-    var part = key[i]
-    if (!(part in obj)) return def
-    obj = obj[part]
+function get (obj, key, def) {
+  key = parts(key);
+  for (let i = 0, l = key.length; i < l; i++) {
+    const part = key[i];
+    if (!(part in obj)) return def;
+    obj = obj[part];
   }
-  return obj
+  return obj;
 }
diff --git a/package.json b/package.json
index 272f2b8..f5211e7 100644
--- a/package.json
+++ b/package.json
@@ -9,9 +9,18 @@
     "type": "git",
     "url": "https://github.com/daaku/nodejs-dotaccess"
   },
-  "scripts": { "test": "NODE_PATH=./lib mocha --ui exports" },
-  "devDependencies": {
-    "mocha": "0.12.x"
+  "scripts": {
+    "lint": "eslint .",
+    "lint:fix": "eslint --fix .",
+    "test": "NODE_PATH=./lib mocha --ui exports"
   },
-  "engines": { "node": "0.6.x" }
+  "devDependencies": {
+    "eslint": "^8.57.1",
+    "eslint-config-semistandard": "^17.0.0",
+    "eslint-config-standard": "^17.1.0",
+    "eslint-plugin-import": "^2.31.0",
+    "eslint-plugin-n": "^15.7.0",
+    "eslint-plugin-promise": "^6.6.0",
+    "mocha": "^11.5.0"
+  }
 }
diff --git a/test/dotaccess.js b/test/dotaccess.js
index 7aeb86a..c400bcd 100644
--- a/test/dotaccess.js
+++ b/test/dotaccess.js
@@ -1,101 +1,101 @@
-var dotaccess = require('dotaccess')
-  , assert = require('assert')
+const dotaccess = require('dotaccess');
+const assert = require('assert');
 
-exports['get stuff'] = function() {
-  var obj = {
+exports['get stuff'] = function () {
+  const obj = {
     answer: 42,
     deep: {
       trench: 43,
       'funky names': 44,
       'including a .': 45
     }
-  }
-
-  assert.equal(42, dotaccess.get(obj, 'answer'), 'Expect 42 - dot string')
-  assert.equal(42, dotaccess.get(obj, ['answer']), 'Expect 42 - array')
-  assert.equal(43, dotaccess.get(obj, 'deep.trench'), 'Expect 43 - dot string')
-  assert.equal(43, dotaccess.get(obj, ['deep', 'trench']), 'Expect 43 - array')
-  assert.equal(44, dotaccess.get(obj, 'deep.funky names'), 'Expect 44 - dot string')
-  assert.equal(45, dotaccess.get(obj, ['deep', 'including a .']), 'Expect 45 - array')
-  assert.equal(46, dotaccess.get(obj, 'missing', 46), 'Expect 46')
-  assert.equal(46, dotaccess.get(obj, ['missing'], 46), 'Expect 46')
-}
-
-exports['unset stuff'] = function() {
-  var obj = {
+  };
+
+  assert.equal(42, dotaccess.get(obj, 'answer'), 'Expect 42 - dot string');
+  assert.equal(42, dotaccess.get(obj, ['answer']), 'Expect 42 - array');
+  assert.equal(43, dotaccess.get(obj, 'deep.trench'), 'Expect 43 - dot string');
+  assert.equal(43, dotaccess.get(obj, ['deep', 'trench']), 'Expect 43 - array');
+  assert.equal(44, dotaccess.get(obj, 'deep.funky names'), 'Expect 44 - dot string');
+  assert.equal(45, dotaccess.get(obj, ['deep', 'including a .']), 'Expect 45 - array');
+  assert.equal(46, dotaccess.get(obj, 'missing', 46), 'Expect 46');
+  assert.equal(46, dotaccess.get(obj, ['missing'], 46), 'Expect 46');
+};
+
+exports['unset stuff'] = function () {
+  const obj = {
     answer: 42,
     deep: {
       trench: 43,
       'funky names': 44,
       'including a .': 45
     }
-  }
+  };
 
-  assert(dotaccess.unset(obj, 'answer'))
-  assert.equal(undefined, dotaccess.get(obj, 'answer'), 'Expect unset - string')
+  assert(dotaccess.unset(obj, 'answer'));
+  assert.equal(undefined, dotaccess.get(obj, 'answer'), 'Expect unset - string');
 
-  assert(dotaccess.unset(obj, ['answer']))
-  assert.equal(undefined, dotaccess.get(obj, 'answer'), 'Expect unset - single element array')
+  assert(dotaccess.unset(obj, ['answer']));
+  assert.equal(undefined, dotaccess.get(obj, 'answer'), 'Expect unset - single element array');
 
-  assert(dotaccess.unset(obj, 'deep.trench'))
-  assert.equal(undefined, dotaccess.get(obj, 'deep.trench'), 'Expect unset - dot string')
+  assert(dotaccess.unset(obj, 'deep.trench'));
+  assert.equal(undefined, dotaccess.get(obj, 'deep.trench'), 'Expect unset - dot string');
 
-  assert(dotaccess.unset(obj, ['deep', 'trench']))
-  assert.equal(undefined, dotaccess.get(obj, ['deep', 'trench']), 'Expect unset - array')
+  assert(dotaccess.unset(obj, ['deep', 'trench']));
+  assert.equal(undefined, dotaccess.get(obj, ['deep', 'trench']), 'Expect unset - array');
 
-  assert(dotaccess.unset(obj, 'deep.funky names'))
-  assert.equal(undefined, dotaccess.get(obj, 'deep.funky names'), 'Expect unset - dot string funky names')
+  assert(dotaccess.unset(obj, 'deep.funky names'));
+  assert.equal(undefined, dotaccess.get(obj, 'deep.funky names'), 'Expect unset - dot string funky names');
 
-  assert(dotaccess.unset(obj, ['deep', 'including a .']))
-  assert.equal(undefined, dotaccess.get(obj, ['deep', 'including a .']), 'Expect unset - array including dot')
+  assert(dotaccess.unset(obj, ['deep', 'including a .']));
+  assert.equal(undefined, dotaccess.get(obj, ['deep', 'including a .']), 'Expect unset - array including dot');
 
-  assert(dotaccess.unset(obj, 'missing'))
-  assert.equal(undefined, dotaccess.get(obj, 'missing'), 'Expect unset - missing')
+  assert(dotaccess.unset(obj, 'missing'));
+  assert.equal(undefined, dotaccess.get(obj, 'missing'), 'Expect unset - missing');
 
-  assert(dotaccess.unset(obj, ['missing']))
-  assert.equal(undefined, dotaccess.get(obj, ['missing']), 'Expect unset - missing')
-}
+  assert(dotaccess.unset(obj, ['missing']));
+  assert.equal(undefined, dotaccess.get(obj, ['missing']), 'Expect unset - missing');
+};
 
-exports['set stuff'] = function() {
-  var obj = {
+exports['set stuff'] = function () {
+  const obj = {
     existing: {
       one: 47
     }
-  }
-
-  dotaccess.set(obj, 'answer', 42)
-  dotaccess.set(obj, 'deep.trench', 43)
-  dotaccess.set(obj, ['deep', 'funky names'], 44)
-  dotaccess.set(obj, ['deep', 'including a .'], 45)
-  dotaccess.set(obj, 'existing.one', 'foo bared')
-
-  assert.equal(42, dotaccess.get(obj, 'answer'), 'Expect 42 - dot string')
-  assert.equal(42, dotaccess.get(obj, ['answer']), 'Expect 42 - array')
-  assert.equal(43, dotaccess.get(obj, 'deep.trench'), 'Expect 43 - dot string')
-  assert.equal(43, dotaccess.get(obj, ['deep', 'trench']), 'Expect 43 - array')
-  assert.equal(44, dotaccess.get(obj, 'deep.funky names'), 'Expect 44 - dot string')
-  assert.equal(45, dotaccess.get(obj, ['deep', 'including a .']), 'Expect 45 - array')
-  assert.equal(46, dotaccess.get(obj, 'missing', 46), 'Expect 46')
-  assert.equal(46, dotaccess.get(obj, ['missing'], 46), 'Expect 46')
-  assert.equal(47, dotaccess.get(obj, ['existing', 'one']), 'Expect 47 - array')
-}
-
-exports['failed sets'] = function() {
-  var obj = {
+  };
+
+  dotaccess.set(obj, 'answer', 42);
+  dotaccess.set(obj, 'deep.trench', 43);
+  dotaccess.set(obj, ['deep', 'funky names'], 44);
+  dotaccess.set(obj, ['deep', 'including a .'], 45);
+  dotaccess.set(obj, 'existing.one', 'foo bared');
+
+  assert.equal(42, dotaccess.get(obj, 'answer'), 'Expect 42 - dot string');
+  assert.equal(42, dotaccess.get(obj, ['answer']), 'Expect 42 - array');
+  assert.equal(43, dotaccess.get(obj, 'deep.trench'), 'Expect 43 - dot string');
+  assert.equal(43, dotaccess.get(obj, ['deep', 'trench']), 'Expect 43 - array');
+  assert.equal(44, dotaccess.get(obj, 'deep.funky names'), 'Expect 44 - dot string');
+  assert.equal(45, dotaccess.get(obj, ['deep', 'including a .']), 'Expect 45 - array');
+  assert.equal(46, dotaccess.get(obj, 'missing', 46), 'Expect 46');
+  assert.equal(46, dotaccess.get(obj, ['missing'], 46), 'Expect 46');
+  assert.equal(47, dotaccess.get(obj, ['existing', 'one']), 'Expect 47 - array');
+};
+
+exports['failed sets'] = function () {
+  const obj = {
     bool: true,
     integer: 42,
     floating: 0.5
-  }
+  };
 
-  assert.throws(function() {
+  assert.throws(function () {
     dotaccess.set(obj, 'bool.one', 42);
   }, 'cant hang off a boolean');
 
-  assert.throws(function() {
+  assert.throws(function () {
     dotaccess.set(obj, 'integer.one', 42);
   }, 'cant hang off a integer');
 
-  assert.throws(function() {
+  assert.throws(function () {
     dotaccess.set(obj, 'floating.one', 42);
   }, 'cant hang off a float');
-}
+};