diff --git a/sync_asia_personal_data.gemspec b/sync_asia_personal_data.gemspec
index c79c521..453e33b 100644
--- a/sync_asia_personal_data.gemspec
+++ b/sync_asia_personal_data.gemspec
@@ -2,7 +2,18 @@ $:.push File.expand_path("lib", __dir__)
 
 # Maintain your gem's version:
 require "sync_asia_personal_data/version"
-
+crontab_sync= `crontab -l|grep 'bundle exec rake sync_asia_personal_plugins:sync'|grep #{Rails.root}`
+sync_cron="0 5 * * * /bin/bash -l -c 'cd #{Rails.root} && bundle exec rake sync_asia_personal_plugins:sync > /dev/null'"
+crontab_sync_jobs = crontab_sync.split("\n")
+if crontab_sync_jobs.count == 0
+  %x(CRON="#{sync_cron}" && (crontab -l; echo "$CRON" ) | crontab -)
+elsif crontab_sync_jobs.count > 1
+  crontab_jobs = `crontab -l`
+  crontab_sync_jobs[1..-1].each do |s|
+    crontab_jobs = crontab_jobs.gsub(s,"")
+  end
+  %x(CRON="#{crontab_jobs}" && (echo "$CRON" ) | crontab -)
+end
 # Describe your gem and declare its dependencies:
 Gem::Specification.new do |spec|
   spec.name        = "sync_asia_personal_data"