diff --git a/CHANGELOG.md b/CHANGELOG.md
index 71b0f203..ee69f6a6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,12 +1,16 @@
+# v0.11.6
+ * Remove behavior of including `AIRTABLE_API_KEY` in airtable.browser.js via envify
+ * Add web worker compatibility
+
 # v0.11.5
  * Update select() and list() to support to use POST endpoint when GET url length would exceed Airtable's 16k character limit
-  * Update select() and list() to explicitly choose to use GET or POST endpoint via new 'method' arg
+ * Update select() and list() to explicitly choose to use GET or POST endpoint via new 'method' arg
 
 # v0.11.4
  * Add support for returnFieldsByFieldId param.
 
 # v0.11.3
- * Adds a UMD build to use for browser-targeted builds. This fixes an issue where other apps that
+ * Add a UMD build to use for browser-targeted builds. This fixes an issue where other apps that
  use airtable.js as a dependency were bundling code that expects to run in a node environment when
  building for a browser enviornment.
 
diff --git a/README.md b/README.md
index 8382a1be..e176fdfe 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,7 @@ There are three configurable options available:
 
 * `apiKey` - your secret API token. Visit [/create/tokens](https://airtable.com/create/tokens) to create a personal access token. [OAuth access tokens](https://airtable.com/developers/web/guides/oauth-integrations) can also be used.
 * `endpointUrl` - the API endpoint to hit. You might want to override
-    it if you are using an API proxy (e.g. runscope.net) to debug your API calls. (`AIRTABLE_ENDPOINT_URL`)
+  it if you are using an API proxy (e.g. runscope.net) to debug your API calls. (`AIRTABLE_ENDPOINT_URL`)
 * `requestTimeout` - the timeout in milliseconds for requests. The default is 5 minutes (`300000`)
 
 You can set the options globally via `Airtable.configure`:
diff --git a/build/airtable.browser.js b/build/airtable.browser.js
index 72b79d33..74d3d106 100644
--- a/build/airtable.browser.js
+++ b/build/airtable.browser.js
@@ -2,11 +2,12 @@ require=(function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c=
 "use strict";
 // istanbul ignore file
 var AbortController;
-if (typeof window === 'undefined') {
+var browserGlobal = typeof window !== 'undefined' ? window : typeof self !== 'undefined' ? self : null; // self is the global in web workers
+if (!browserGlobal) {
     AbortController = require('abort-controller');
 }
 else if ('signal' in new Request('')) {
-    AbortController = window.AbortController;
+    AbortController = browserGlobal.AbortController;
 }
 else {
     /* eslint-disable @typescript-eslint/no-var-requires */
@@ -326,7 +327,8 @@ var __importDefault = (this && this.__importDefault) || function (mod) {
 };
 // istanbul ignore file
 var node_fetch_1 = __importDefault(require("node-fetch"));
-module.exports = typeof window === 'undefined' ? node_fetch_1.default : window.fetch.bind(window);
+var browserGlobal = typeof window !== 'undefined' ? window : typeof self !== 'undefined' ? self : null; // self is the global in web workers
+module.exports = !browserGlobal ? node_fetch_1.default : browserGlobal.fetch.bind(browserGlobal);
 
 },{"node-fetch":20}],8:[function(require,module,exports){
 "use strict";
@@ -443,7 +445,7 @@ module.exports = objectToQueryParamString;
 
 },{"lodash/isArray":79,"lodash/isNil":85,"lodash/keys":93}],12:[function(require,module,exports){
 "use strict";
-module.exports = "0.11.5";
+module.exports = "0.11.6";
 
 },{}],13:[function(require,module,exports){
 "use strict";
@@ -3718,9 +3720,9 @@ var Airtable = /** @class */ (function () {
     };
     Airtable.default_config = function () {
         return {
-            endpointUrl: undefined || 'https://api.airtable.com',
+            endpointUrl: "" || 'https://api.airtable.com',
             apiVersion: '0.1.0',
-            apiKey: undefined,
+            apiKey: "",
             noRetryIfRateLimited: false,
             requestTimeout: 300 * 1000,
         };
diff --git a/gruntfile.js b/gruntfile.js
index 497c7488..6e799437 100644
--- a/gruntfile.js
+++ b/gruntfile.js
@@ -21,8 +21,11 @@ module.exports = function(grunt) {
                     transform: [
                         [
                             'envify',
+                            // IMPORTANT: mask out environment variables that should never be shipped to the browser
                             {
                                 _: 'purge',
+                                AIRTABLE_ENDPOINT_URL: '',
+                                AIRTABLE_API_KEY: '',
                                 npm_package_version: pkg.version,
                             },
                         ],
@@ -42,8 +45,11 @@ module.exports = function(grunt) {
                     transform: [
                         [
                             'envify',
+                            // IMPORTANT: mask out environment variables that should never be shipped to the browser
                             {
                                 _: 'purge',
+                                AIRTABLE_ENDPOINT_URL: '',
+                                AIRTABLE_API_KEY: '',
                                 npm_package_version: pkg.version,
                             },
                         ],
diff --git a/package-lock.json b/package-lock.json
index 6a0b6d79..5a78988b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "airtable",
-  "version": "0.11.5",
+  "version": "0.11.6",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
diff --git a/package.json b/package.json
index 086e0c56..d2f339ae 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "airtable",
-  "version": "0.11.5",
+  "version": "0.11.6",
   "license": "MIT",
   "homepage": "https://github.com/airtable/airtable.js",
   "repository": "git://github.com/airtable/airtable.js.git",
diff --git a/src/abort-controller.ts b/src/abort-controller.ts
index f6482128..ed11d79a 100644
--- a/src/abort-controller.ts
+++ b/src/abort-controller.ts
@@ -1,9 +1,11 @@
 // istanbul ignore file
 let AbortController: new () => AbortController;
-if (typeof window === 'undefined') {
+const browserGlobal =
+    typeof window !== 'undefined' ? window : typeof self !== 'undefined' ? self : null; // self is the global in web workers
+if (!browserGlobal) {
     AbortController = require('abort-controller');
 } else if ('signal' in new Request('')) {
-    AbortController = window.AbortController;
+    AbortController = browserGlobal.AbortController;
 } else {
     /* eslint-disable @typescript-eslint/no-var-requires */
     const polyfill = require('abortcontroller-polyfill/dist/cjs-ponyfill');
diff --git a/src/fetch.ts b/src/fetch.ts
index d1cc2736..08f7f0ed 100644
--- a/src/fetch.ts
+++ b/src/fetch.ts
@@ -1,4 +1,7 @@
 // istanbul ignore file
 import nodeFetch from 'node-fetch';
 
-export = typeof window === 'undefined' ? (nodeFetch as typeof fetch) : window.fetch.bind(window);
+const browserGlobal =
+    typeof window !== 'undefined' ? window : typeof self !== 'undefined' ? self : null; // self is the global in web workers
+
+export = !browserGlobal ? (nodeFetch as typeof fetch) : browserGlobal.fetch.bind(browserGlobal);
diff --git a/test/test_files/airtable.browser.js b/test/test_files/airtable.browser.js
index 72b79d33..74d3d106 100644
--- a/test/test_files/airtable.browser.js
+++ b/test/test_files/airtable.browser.js
@@ -2,11 +2,12 @@ require=(function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c=
 "use strict";
 // istanbul ignore file
 var AbortController;
-if (typeof window === 'undefined') {
+var browserGlobal = typeof window !== 'undefined' ? window : typeof self !== 'undefined' ? self : null; // self is the global in web workers
+if (!browserGlobal) {
     AbortController = require('abort-controller');
 }
 else if ('signal' in new Request('')) {
-    AbortController = window.AbortController;
+    AbortController = browserGlobal.AbortController;
 }
 else {
     /* eslint-disable @typescript-eslint/no-var-requires */
@@ -326,7 +327,8 @@ var __importDefault = (this && this.__importDefault) || function (mod) {
 };
 // istanbul ignore file
 var node_fetch_1 = __importDefault(require("node-fetch"));
-module.exports = typeof window === 'undefined' ? node_fetch_1.default : window.fetch.bind(window);
+var browserGlobal = typeof window !== 'undefined' ? window : typeof self !== 'undefined' ? self : null; // self is the global in web workers
+module.exports = !browserGlobal ? node_fetch_1.default : browserGlobal.fetch.bind(browserGlobal);
 
 },{"node-fetch":20}],8:[function(require,module,exports){
 "use strict";
@@ -443,7 +445,7 @@ module.exports = objectToQueryParamString;
 
 },{"lodash/isArray":79,"lodash/isNil":85,"lodash/keys":93}],12:[function(require,module,exports){
 "use strict";
-module.exports = "0.11.5";
+module.exports = "0.11.6";
 
 },{}],13:[function(require,module,exports){
 "use strict";
@@ -3718,9 +3720,9 @@ var Airtable = /** @class */ (function () {
     };
     Airtable.default_config = function () {
         return {
-            endpointUrl: undefined || 'https://api.airtable.com',
+            endpointUrl: "" || 'https://api.airtable.com',
             apiVersion: '0.1.0',
-            apiKey: undefined,
+            apiKey: "",
             noRetryIfRateLimited: false,
             requestTimeout: 300 * 1000,
         };