diff --git a/.travis.yml b/.travis.yml
index 6622abe9..b2324315 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,7 +9,7 @@ cache:
     - node_modules
 
 addons:
-  firefox: 62.0
+  firefox: 66.0
   chrome: stable
 
 # limit the Travis 'build on push' feature to the master branch only
diff --git a/wct.conf.js b/wct.conf.js
index 821bfaa3..bf8da2ba 100644
--- a/wct.conf.js
+++ b/wct.conf.js
@@ -38,8 +38,8 @@ module.exports = {
         'macOS 10.12/safari@10.1',
 
         // last 2 iOS major versions (mobile Safari)
+        'iOS Simulator/iphone@12.0',
         'iOS Simulator/iphone@11.0',
-        'iOS Simulator/iphone@10.0',
 
         // Safari 9 on desktop and mobile
         'OS X 10.11/safari@9.0',