diff --git a/sync_fgu_personal_data.gemspec b/sync_fgu_personal_data.gemspec
index c41c355..f4dda61 100644
--- a/sync_fgu_personal_data.gemspec
+++ b/sync_fgu_personal_data.gemspec
@@ -34,30 +34,34 @@ if bundle_update_flag
     puts "Installing tiny_tds gem ..."
     bundler_with_clean_env{ system("gem install tiny_tds -- '--with-freetds-dir=#{home_path}/freetds-1.1.24_build'") }
   end
-  crontab_sync = `crontab -l|grep 'bundle exec rake sync_fgu_personal_plugins:sync'|grep #{ENV['PWD']}`
-  sync_cron="0 0 * * * /bin/bash -l -c 'cd #{ENV['PWD']} && bundle exec rake sync_fgu_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 "$CRON" ) | crontab -)
-  elsif crontab_sync_jobs.count > 1
-    crontab_jobs = `crontab -l`
-    crontab_sync_jobs[1..-1].each do |s|
-      crontab_jobs = crontab_jobs.sub(s,"")
-    end
-    %x(CRON="#{crontab_jobs}" && (echo "$CRON" ) | crontab -)
-  elsif crontab_sync_jobs[0][0...3] == "0 5" #replace old cronjob settings
-    crontab_jobs = `crontab -l`
-    crontab_jobs = crontab_jobs.sub(crontab_sync_jobs[0],sync_cron)
-    %x(CRON="#{crontab_jobs}" && (echo "$CRON" ) | crontab -)
-  elsif crontab_sync_jobs[0].include?("-23/12") #replace 12 hours to 24 hours
-    crontab_jobs = `crontab -l`
-    crontab_jobs = crontab_jobs.sub(crontab_sync_jobs[0],crontab_sync_jobs[0].sub("-23/12",""))
-    %x(CRON="#{crontab_jobs}" && (echo "$CRON" ) | crontab -)
-  elsif crontab_sync_jobs[0].include?("*/12") #replace 12 hours to 24 hours
-    crontab_jobs = `crontab -l`
-    crontab_jobs = crontab_jobs.sub(crontab_sync_jobs[0],crontab_sync_jobs[0].sub("*/12","0"))
-    %x(CRON="#{crontab_jobs}" && (echo "$CRON" ) | crontab -)
-  end
+  # ===== 自動寫入/修正 crontab 邏輯已停用 2026-09-07：因多站台部署時間不同，
+  # ===== 全數寫死排在 "0 0 * * *"，造成 13+ 個站台的 sync 排程集中在同一分鐘，
+  # ===== 導致記憶體瞬間暴衝、mongod 被 OOM Killer 強制關閉。crontab 時間改為手動維護。
+  #
+  # crontab_sync = `crontab -l|grep 'bundle exec rake sync_fgu_personal_plugins:sync'|grep #{ENV['PWD']}`
+  # sync_cron="0 0 * * * /bin/bash -l -c 'cd #{ENV['PWD']} && bundle exec rake sync_fgu_personal_plugins:sync > /dev/null'"
+  # crontab_sync_jobs = crontab_sync.split("\n")
+  # if crontab_sync_jobs.count == 0
+  #   %x(CRON="#{sync_cron}" && (crontab -l; echo "$CRON" ) | crontab -)
+  # elsif crontab_sync_jobs.count > 1
+  #   crontab_jobs = `crontab -l`
+  #   crontab_sync_jobs[1..-1].each do |s|
+  #     crontab_jobs = crontab_jobs.sub(s,"")
+  #   end
+  #   %x(CRON="#{crontab_jobs}" && (echo "$CRON" ) | crontab -)
+  # elsif crontab_sync_jobs[0][0...3] == "0 5" #replace old cronjob settings
+  #   crontab_jobs = `crontab -l`
+  #   crontab_jobs = crontab_jobs.sub(crontab_sync_jobs[0],sync_cron)
+  #   %x(CRON="#{crontab_jobs}" && (echo "$CRON" ) | crontab -)
+  # elsif crontab_sync_jobs[0].include?("-23/12") #replace 12 hours to 24 hours
+  #   crontab_jobs = `crontab -l`
+  #   crontab_jobs = crontab_jobs.sub(crontab_sync_jobs[0],crontab_sync_jobs[0].sub("-23/12",""))
+  #   %x(CRON="#{crontab_jobs}" && (echo "$CRON" ) | crontab -)
+  # elsif crontab_sync_jobs[0].include?("*/12") #replace 12 hours to 24 hours
+  #   crontab_jobs = `crontab -l`
+  #   crontab_jobs = crontab_jobs.sub(crontab_sync_jobs[0],crontab_sync_jobs[0].sub("*/12","0"))
+  #   %x(CRON="#{crontab_jobs}" && (echo "$CRON" ) | crontab -)
+  # end
 end
 # Describe your gem and declare its dependencies:
 Gem::Specification.new do |spec|