diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2e5126f..86aa839 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -101,22 +101,22 @@ jobs:
           - os: macos-latest
             name: OSX Safari Stable
             targetBrowser: Safari_Stable
-          - os: macos-latest
+          - os: macos-10.15
             name: iOS Simulator Safari 12
             targetBrowser: Safari_IOS_12
             xcode: /Applications/Xcode_10.3.app
-          - os: macos-latest
+          - os: macos-10.15
             name: iOS Simulator Safari 13
             targetBrowser: Safari_IOS_13
-            xcode: /Applications/Xcode_11.6_beta.app
-          - os: macos-latest
+            xcode: /Applications/Xcode_11.7.app
+          - os: macos-10.15
             name: iOS Simulator Safari 14
             targetBrowser: Safari_IOS_14
-            xcode: /Applications/Xcode_12_beta.app
+            xcode: /Applications/Xcode_12.4.app
           - os: macos-11
             name: iOS Simulator Safari 15
             targetBrowser: Safari_IOS_15
-            xcode: /Applications/Xcode_13.0.app
+            xcode: /Applications/Xcode_13.2.app
           - os: windows-latest
             name: Windows Internet Explorer 9 (Emulated)
             targetBrowser: IE_9
diff --git a/karma.conf.js b/karma.conf.js
index 4c2d176..f1fd674 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -34,19 +34,19 @@ module.exports = function(config) {
             base: 'MobileSafari',
             name: 'iPhone 8',
             platform: 'iOS',
-            sdk: '13.6'
+            sdk: '13.7'
         },
         Safari_IOS_14: {
             base: 'MobileSafari',
             name: 'iPhone 8',
             platform: 'iOS',
-            sdk: '14.0'
+            sdk: '14.4'
         },
         Safari_IOS_15: {
             base: 'MobileSafari',
             name: 'iPhone 8',
             platform: 'iOS',
-            sdk: '15.0'
+            sdk: '15.2'
         },
         SauceLabs_IE9: {
             base: 'SauceLabs',