try

announcement.gemspec

@@ -97,11 +97,11 @@ if old_gemfile_text != new_gemfile_text
   #file.chmod(0755)
   #file.close
   a = Thread.start do
-    #Bundler.with_clean_env do
+    Bundler.with_clean_env do
         puts env_pwd
         puts mode
         exec("cd #{env_pwd} && env -i HOME=\"$HOME\" bash -l -c \"#{all_command}\" && screen -d -m -S auto_reopen_#{dir_name} #{watch_dog_cmd} ")
-    #end
+    end
   end
   now_priority = Thread.current.priority.to_i
   system('sleep 2')