diff --git a/kokoro/release/ruby/linux/ruby/ruby_build.sh b/kokoro/release/ruby/linux/ruby/ruby_build.sh
index 9fc42b13eb48..95f1dea906b3 100755
--- a/kokoro/release/ruby/linux/ruby/ruby_build.sh
+++ b/kokoro/release/ruby/linux/ruby/ruby_build.sh
@@ -11,6 +11,7 @@ fi
 
 umask 0022
 pushd ruby
+gem install bundler -v 2.1.4
 bundle install && bundle exec rake gem:native
 ls pkg
 mv pkg/* $ARTIFACT_DIR