diff --git a/babel.config.js b/babel.config.js
deleted file mode 100644
index 873b92c..0000000
--- a/babel.config.js
+++ /dev/null
@@ -1,10 +0,0 @@
-let presets = ["babel-preset-atomic"];
-
-let plugins = ["@babel/plugin-transform-classes"] // this is needed so Disposabale can be extended by ES5-style classes
-
-module.exports = {
-  presets: presets,
-  plugins: plugins,
-  exclude: "node_modules/**",
-  sourceMap: true,
-}
diff --git a/package.json b/package.json
index 5efa0a5..fa39043 100644
--- a/package.json
+++ b/package.json
@@ -2,11 +2,10 @@
   "name": "event-kit",
   "version": "2.5.3",
   "description": "Simple library for implementing and consuming evented APIs",
-  "main": "./dist/event-kit",
+  "main": "./lib/event-kit.js",
   "scripts": {
-    "build": "cross-env BABEL_KEEP_MODULES=false babel lib --out-dir dist --delete-dir-on-start",
     "docs": "joanna-tello -o api.json package.json lib",
-    "prepublish": "npm run build && npm run docs",
+    "prepublish": "npm run docs",
     "test": "jasmine-focused --captureExceptions --forceexit spec"
   },
   "repository": {
@@ -18,10 +17,6 @@
   },
   "license": "MIT",
   "devDependencies": {
-    "@babel/cli": "^7.12.10",
-    "@babel/core": "^7.12.10",
-    "babel-preset-atomic": "^3.0.1",
-    "cross-env": "^7.0.3",
     "jasmine-focused": "^1.0.7",
     "joanna": "https://github.com/aminya/joanna"
   }
diff --git a/spec/composite-disposable-spec.js b/spec/composite-disposable-spec.js
index 55e5a55..bfabb34 100644
--- a/spec/composite-disposable-spec.js
+++ b/spec/composite-disposable-spec.js
@@ -1,5 +1,4 @@
-const CompositeDisposable = require("../dist/composite-disposable")
-const Disposable = require("../dist/disposable")
+const { CompositeDisposable, Disposable } = require("../lib/event-kit.js");
 
 describe("CompositeDisposable", function() {
   let disposable1, disposable2, disposable3
diff --git a/spec/disposable-spec.js b/spec/disposable-spec.js
index 0f9716d..0d58246 100644
--- a/spec/disposable-spec.js
+++ b/spec/disposable-spec.js
@@ -1,4 +1,4 @@
-const Disposable = require("../dist/disposable")
+const { Disposable } = require("../lib/event-kit.js");
 
 describe("Disposable", function() {
   it("does not try to execute disposalAction when it is not a function", function() {
@@ -23,19 +23,18 @@ describe("Disposable", function() {
     expect(disposalAction.callCount).toBe(1)
   })
 
-  it('can be extended by ES5-style classes', () => {
-    function MyDisposable () {
-      // super
-      Disposable.apply(this, arguments)
+  it("can be extended by ES6-style classes", () => {
+    class MyDisposable extends Disposable {
+      constructor(...args) {
+        super(...args);
+      }
     }
 
-    MyDisposable.prototype = new Disposable()
-
-    let actionCalled = false
-    const disposable = new MyDisposable(() => { actionCalled = true })
-    disposable.dispose()
-    expect(actionCalled).toBe(true)
-  })
+    let actionCalled = false;
+    const disposable = new MyDisposable(() => { actionCalled = true });
+    disposable.dispose();
+    expect(actionCalled).toBe(true);
+  });
 
   describe(".isDisposable(object)", () => {
     it("true if the object implements the ::dispose function", function() {
diff --git a/spec/emitter-spec.js b/spec/emitter-spec.js
index 6f63b97..519425f 100644
--- a/spec/emitter-spec.js
+++ b/spec/emitter-spec.js
@@ -1,4 +1,4 @@
-const Emitter = require("../dist/emitter")
+const { Emitter } = require("../lib/event-kit.js");
 
 describe("Emitter", function() {
   it("invokes the observer when the named event is emitted until disposed", function() {