diff --git a/Library/Homebrew/Gemfile.lock b/Library/Homebrew/Gemfile.lock
index dc9aa4cdde..8dcac009e6 100644
--- a/Library/Homebrew/Gemfile.lock
+++ b/Library/Homebrew/Gemfile.lock
@@ -110,7 +110,7 @@ GEM
     unf_ext (0.0.7.7)
     unicode-display_width (1.7.0)
     webrobots (0.1.2)
-    zeitwerk (2.3.1)
+    zeitwerk (2.4.0)
 
 PLATFORMS
   ruby
diff --git a/Library/Homebrew/vendor/bundle/bundler/setup.rb b/Library/Homebrew/vendor/bundle/bundler/setup.rb
index 7f8b6150a5..4d61c0c9ca 100644
--- a/Library/Homebrew/vendor/bundle/bundler/setup.rb
+++ b/Library/Homebrew/vendor/bundle/bundler/setup.rb
@@ -8,7 +8,7 @@ $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/i18n-1.8.3/lib"
 $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/minitest-5.14.1/lib"
 $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/thread_safe-0.3.6/lib"
 $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/tzinfo-1.2.7/lib"
-$:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/zeitwerk-2.3.1/lib"
+$:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/zeitwerk-2.4.0/lib"
 $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/activesupport-6.0.3.2/lib"
 $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/ast-2.4.1/lib"
 $:.unshift "#{path}/"
@@ -20,7 +20,7 @@ $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/json-2.3.1/lib"
 $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/docile-1.3.2/lib"
 $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/simplecov-html-0.12.2/lib"
 $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/simplecov-0.18.5/lib"
-$:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/codecov-0.1.19/lib"
+$:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/codecov-0.2.1/lib"
 $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/connection_pool-2.2.3/lib"
 $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/diff-lcs-1.4.4/lib"
 $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/extensions/universal-darwin-19/2.6.0/unf_ext-0.0.7.7"
@@ -62,7 +62,7 @@ $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/rspec-wait-0.0.9/lib"
 $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/rubocop-ast-0.1.0/lib"
 $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/ruby-progressbar-1.10.1/lib"
 $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/unicode-display_width-1.7.0/lib"
-$:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/rubocop-0.87.1/lib"
+$:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/rubocop-0.88.0/lib"
 $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/rubocop-performance-1.7.0/lib"
 $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/rubocop-rspec-1.42.0/lib"
 $:.unshift "#{path}/../#{ruby_engine}/#{ruby_version}/gems/ruby-macho-2.2.0/lib"
diff --git a/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.1/lib/zeitwerk.rb b/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk.rb
similarity index 100%
rename from Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.1/lib/zeitwerk.rb
rename to Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk.rb
diff --git a/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.1/lib/zeitwerk/error.rb b/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk/error.rb
similarity index 100%
rename from Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.1/lib/zeitwerk/error.rb
rename to Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk/error.rb
diff --git a/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.1/lib/zeitwerk/explicit_namespace.rb b/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk/explicit_namespace.rb
similarity index 100%
rename from Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.1/lib/zeitwerk/explicit_namespace.rb
rename to Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk/explicit_namespace.rb
diff --git a/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.1/lib/zeitwerk/gem_inflector.rb b/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk/gem_inflector.rb
similarity index 100%
rename from Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.1/lib/zeitwerk/gem_inflector.rb
rename to Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk/gem_inflector.rb
diff --git a/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.1/lib/zeitwerk/inflector.rb b/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk/inflector.rb
similarity index 94%
rename from Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.1/lib/zeitwerk/inflector.rb
rename to Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk/inflector.rb
index b04bb74d02..4898376ccf 100644
--- a/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.1/lib/zeitwerk/inflector.rb
+++ b/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk/inflector.rb
@@ -15,7 +15,7 @@ module Zeitwerk
     # @param _abspath [String]
     # @return [String]
     def camelize(basename, _abspath)
-      overrides[basename] || basename.split('_').map!(&:capitalize).join
+      overrides[basename] || basename.split('_').each(&:capitalize!).join
     end
 
     # Configures hard-coded inflections:
diff --git a/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.1/lib/zeitwerk/kernel.rb b/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk/kernel.rb
similarity index 100%
rename from Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.1/lib/zeitwerk/kernel.rb
rename to Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk/kernel.rb
diff --git a/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.1/lib/zeitwerk/loader.rb b/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk/loader.rb
similarity index 97%
rename from Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.1/lib/zeitwerk/loader.rb
rename to Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk/loader.rb
index 8279ee8a6e..4d0b5c252f 100644
--- a/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.1/lib/zeitwerk/loader.rb
+++ b/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk/loader.rb
@@ -190,13 +190,19 @@ module Zeitwerk
     # or descendants.
     #
     # @param path [<String, Pathname>]
+    # @param namespace [Class, Module]
     # @raise [Zeitwerk::Error]
     # @return [void]
-    def push_dir(path)
+    def push_dir(path, namespace: Object)
+      # Note that Class < Module.
+      unless namespace.is_a?(Module)
+        raise Error, "#{namespace.inspect} is not a class or module object, should be"
+      end
+
       abspath = File.expand_path(path)
       if dir?(abspath)
         raise_if_conflicting_directory(abspath)
-        root_dirs[abspath] = true
+        root_dirs[abspath] = namespace
       else
         raise Error, "the root directory #{abspath} does not exist"
       end
@@ -268,7 +274,9 @@ module Zeitwerk
       mutex.synchronize do
         break if @setup
 
-        actual_root_dirs.each { |root_dir| set_autoloads_in_dir(root_dir, Object) }
+        actual_root_dirs.each do |root_dir, namespace|
+          set_autoloads_in_dir(root_dir, namespace)
+        end
         do_preload
 
         @setup = true
@@ -368,8 +376,11 @@ module Zeitwerk
       mutex.synchronize do
         break if @eager_loaded
 
-        queue = actual_root_dirs.reject { |dir| eager_load_exclusions.member?(dir) }
-        queue.map! { |dir| [Object, dir] }
+        queue = []
+        actual_root_dirs.each do |root_dir, namespace|
+          queue << [namespace, root_dir] unless eager_load_exclusions.member?(root_dir)
+        end
+
         while to_eager_load = queue.shift
           namespace, dir = to_eager_load
 
@@ -498,7 +509,7 @@ module Zeitwerk
 
     # @return [<String>]
     def actual_root_dirs
-      root_dirs.keys.delete_if do |root_dir|
+      root_dirs.reject do |root_dir, _namespace|
         !dir?(root_dir) || ignored_paths.member?(root_dir)
       end
     end
diff --git a/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.1/lib/zeitwerk/loader/callbacks.rb b/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk/loader/callbacks.rb
similarity index 100%
rename from Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.1/lib/zeitwerk/loader/callbacks.rb
rename to Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk/loader/callbacks.rb
diff --git a/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.1/lib/zeitwerk/real_mod_name.rb b/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk/real_mod_name.rb
similarity index 100%
rename from Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.1/lib/zeitwerk/real_mod_name.rb
rename to Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk/real_mod_name.rb
diff --git a/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.1/lib/zeitwerk/registry.rb b/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk/registry.rb
similarity index 100%
rename from Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.1/lib/zeitwerk/registry.rb
rename to Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk/registry.rb
diff --git a/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.1/lib/zeitwerk/version.rb b/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk/version.rb
similarity index 71%
rename from Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.1/lib/zeitwerk/version.rb
rename to Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk/version.rb
index b2d4e2805d..b62889cf79 100644
--- a/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.1/lib/zeitwerk/version.rb
+++ b/Library/Homebrew/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.4.0/lib/zeitwerk/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Zeitwerk
-  VERSION = "2.3.1"
+  VERSION = "2.4.0"
 end