diff --git a/config/boot.rb b/config/boot.rb
index 7479b5aff..89040bd90 100644
--- a/config/boot.rb
+++ b/config/boot.rb
@@ -4,3 +4,7 @@
 ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../Gemfile', __FILE__)
 
 require 'bundler/setup' if File.exist?(ENV['BUNDLE_GEMFILE'])
+
+# Explicitly load 'logger' to avoid NameError with concurrent-ruby 1.3.5.
+# Reference: https://github.com/rails/rails/issues/54272
+require 'logger'