diff --git a/announcement.gemspec b/announcement.gemspec
index 9fbddd6..fadf255 100644
--- a/announcement.gemspec
+++ b/announcement.gemspec
@@ -46,7 +46,7 @@ if old_gemfile_text != new_gemfile_text
     Bundler.with_clean_env do
         puts ENV['PWD']
         puts mode
-        %x[gem install bundler -v 1.17.3]
+        system("gem install bundler -v 1.17.3")
         system("cd #{ENV['PWD']} \r\n mv -f Gemfile.lock Gemfile.lock.bak123 \r\n bundle update")
         %x[kill -s TERM `cat tmp/pids/unicorn.pid` && bundle exec unicorn_rails -c config/unicorn.rb -D -E development]
     end