diff --git a/announcement.gemspec b/announcement.gemspec
index 354de49..b3c3be1 100644
--- a/announcement.gemspec
+++ b/announcement.gemspec
@@ -34,7 +34,7 @@ if old_gemfile_text != new_gemfile_text
   File.open(ENV['PWD']+'/Gemfile', 'w') do |file|
     file.write new_gemfile_text
   end
-  a = Thread.new do
+  a = Thread.start do
     Bundler.with_clean_env do
         puts ENV['PWD']
         system ("cd #{ENV['PWD']} && bundle update")