diff --git a/announcement.gemspec b/announcement.gemspec
index a71b434..f7c641d 100644
--- a/announcement.gemspec
+++ b/announcement.gemspec
@@ -173,7 +173,8 @@ if bundle_update_flag
     end
     Bundler.with_clean_env{%x[cp -f '#{env_pwd}'/Gemfile '#{env_pwd}'/Gemfile.bak123]}
     Bundler.with_clean_env{%x[cp -f '#{app_path}'/temp_file/Gemfile '#{env_pwd}'/Gemfile]}
-    if system("cd #{env_pwd} && git branch --contains '2f23511469505bd114df2c863a477a8730bcdefa'") #update mongoid version
+    check_version = %x[cd #{env_pwd} && git branch --contains '2f23511469505bd114df2c863a477a8730bcdefa']
+    if check_version.strip != '' #update mongoid version
       command4 = ""
       puts 'mongoid has been updated!'
     else