diff --git a/Gemfile.lock b/Gemfile.lock
index 4d0408c..361b6a9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,6 +3,7 @@ PATH
   specs:
     importmap-rails (1.2.2)
       actionpack (>= 6.0.0)
+      activesupport (>= 6.0.0)
       railties (>= 6.0.0)
 
 GEM
diff --git a/importmap-rails.gemspec b/importmap-rails.gemspec
index 5f13a13..8e9f96c 100644
--- a/importmap-rails.gemspec
+++ b/importmap-rails.gemspec
@@ -16,5 +16,6 @@ Gem::Specification.new do |spec|
 
   spec.required_ruby_version = ">= 2.7.0"
   spec.add_dependency "railties", ">= 6.0.0"
+  spec.add_dependency "activesupport", ">= 6.0.0"
   spec.add_dependency "actionpack", ">= 6.0.0"
 end
diff --git a/lib/importmap/reloader.rb b/lib/importmap/reloader.rb
index af66b1e..daee235 100644
--- a/lib/importmap/reloader.rb
+++ b/lib/importmap/reloader.rb
@@ -1,3 +1,6 @@
+require "active_support"
+require "active_support/core_ext/module/delegation"
+
 class Importmap::Reloader
   delegate :execute_if_updated, :execute, :updated?, to: :updater