diff --git a/package.json b/package.json
index 52556417..b45b1ae2 100644
--- a/package.json
+++ b/package.json
@@ -7,14 +7,14 @@
     "./src/crypto-sha1-2.js": "./src/crypto-sha1-2-browser.js"
   },
   "scripts": {
-    "test": "aegir-test --webworker",
-    "test:browser": "aegir-test browser --webworker",
+    "test": "aegir-test",
+    "test:browser": "aegir-test browser",
     "test:node": "aegir-test node",
     "lint": "aegir-lint",
     "docs": "aegir-docs",
-    "release": "aegir-release --docs --webworker",
-    "release-minor": "aegir-release minor --docs --webworker",
-    "release-major": "aegir-release major --docs --webworker",
+    "release": "aegir-release --docs",
+    "release-minor": "aegir-release minor --docs",
+    "release-major": "aegir-release major --docs",
     "build": "aegir-build",
     "coverage": "aegir-coverage",
     "coverage-publish": "aegir-coverage publish",
@@ -44,7 +44,7 @@
     "nodeify": "^1.0.0"
   },
   "devDependencies": {
-    "aegir": "^9.4.0",
+    "aegir": "^10.0.0",
     "benchmark": "^2.1.3",
     "chai": "^3.5.0",
     "pre-commit": "^1.2.2"
@@ -63,4 +63,4 @@
     "Richard Littauer <richard.littauer@gmail.com>",
     "npm-to-cdn-bot (by Forbes Lindesay) <npmcdn-to-unpkg-bot@users.noreply.github.com>"
   ]
-}
\ No newline at end of file
+}
diff --git a/src/crypto-sha1-2-browser.js b/src/crypto-sha1-2-browser.js
index 837c26ec..17742ec0 100644
--- a/src/crypto-sha1-2-browser.js
+++ b/src/crypto-sha1-2-browser.js
@@ -1,4 +1,3 @@
-/* global self */
 'use strict'
 
 const nodeify = require('nodeify')
@@ -6,22 +5,12 @@ const nodeify = require('nodeify')
 const webCrypto = getWebCrypto()
 
 function getWebCrypto () {
-  let globalContext
-
-  if (typeof window !== 'undefined') {
-    globalContext = window
-  } else if (typeof self !== 'undefined') {
-    globalContext = self
-  } else {
-    return
-  }
-
-  if (globalContext.crypto) {
-    return globalContext.crypto.subtle || globalContext.crypto.webkitSubtle
+  if (self.crypto) {
+    return self.crypto.subtle || self.crypto.webkitSubtle
   }
 
-  if (globalContext.msCrypto) {
-    return globalContext.msCrypto.subtle
+  if (self.msCrypto) {
+    return self.msCrypto.subtle
   }
 }