diff --git a/spec/travis-actionmailer.sh b/spec/travis-actionmailer.sh
index a2a204434..89136cee9 100755
--- a/spec/travis-actionmailer.sh
+++ b/spec/travis-actionmailer.sh
@@ -4,6 +4,7 @@ set -v -e
 git clone --depth=1 https://github.com/rails/rails.git -b master
 cd rails
 echo -e "\ngem 'mail', path: '../'" >> Gemfile
-bundle update --source mail
+gem update bundler
+bundle update --bundler --source mail
 cd actionmailer
 bundle exec rake test
\ No newline at end of file