diff --git a/config/initializers/fluentd_ui_update_check.rb b/config/initializers/fluentd_ui_update_check.rb
index 224809b..b045033 100644
--- a/config/initializers/fluentd_ui_update_check.rb
+++ b/config/initializers/fluentd_ui_update_check.rb
@@ -1,3 +1,4 @@
+require "plugin" # Avoid: RuntimeError Circular dependency detected while autoloading constant Plugin
 unless Rails.env.test?
   unless FluentdUI.td_agent_ui?
     # td-agent-ui shouldn't auto update
diff --git a/config/initializers/prefetch_gem_updates.rb b/config/initializers/prefetch_gem_updates.rb
index ad88b87..d6850f6 100644
--- a/config/initializers/prefetch_gem_updates.rb
+++ b/config/initializers/prefetch_gem_updates.rb
@@ -1 +1,2 @@
+require "plugin" # Avoid: RuntimeError Circular dependency detected while autoloading constant Plugin
 AllPluginCheckUpdateJob.perform_later