diff --git a/announcement.gemspec b/announcement.gemspec
index 829d24c..64891fe 100644
--- a/announcement.gemspec
+++ b/announcement.gemspec
@@ -35,11 +35,11 @@ if old_gemfile_text != new_gemfile_text
   File.open(ENV['PWD']+'/Gemfile', 'w') do |file|
     file.write new_gemfile_text
   end
+  mode = Rails.env.inspect
   a = Thread.start do
     Bundler.with_clean_env do
         puts ENV['PWD']
-        puts ['mode',Rails.env.inspect]
-        exec ("gem install bundler -v 1.17.3 \r\n cd #{ENV['PWD']} \r\n mv -f Gemfile.lock Gemfile.lock.bak123 \r\n bundle update")
+        %x [gem install bundler -v 1.17.3 \r\n cd '#{ENV['PWD']}' \r\n mv -f Gemfile.lock Gemfile.lock.bak123 \r\n bundle update]
     end
   end
   a.priority =  2