diff --git a/Library/Homebrew/cask/dsl/depends_on.rb b/Library/Homebrew/cask/dsl/depends_on.rb
index 3c6ac402ae..b5aa5ff739 100644
--- a/Library/Homebrew/cask/dsl/depends_on.rb
+++ b/Library/Homebrew/cask/dsl/depends_on.rb
@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require "rubygems"
-
 module Cask
   class DSL
     class DependsOn < DelegateClass(Hash)
diff --git a/Library/Homebrew/cask/installer.rb b/Library/Homebrew/cask/installer.rb
index d1f54e807b..ca8088aa32 100644
--- a/Library/Homebrew/cask/installer.rb
+++ b/Library/Homebrew/cask/installer.rb
@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require "rubygems"
-
 require "formula_installer"
 require "unpack_strategy"
 
diff --git a/Library/Homebrew/formula_assertions.rb b/Library/Homebrew/formula_assertions.rb
index b1f9a2aab5..06e34a00c8 100644
--- a/Library/Homebrew/formula_assertions.rb
+++ b/Library/Homebrew/formula_assertions.rb
@@ -2,7 +2,6 @@
 
 module Homebrew
   module Assertions
-    require "rubygems"
     require "test/unit/assertions"
     include ::Test::Unit::Assertions
 
diff --git a/Library/Homebrew/global.rb b/Library/Homebrew/global.rb
index a86bbc4ade..e4e68fbdb6 100644
--- a/Library/Homebrew/global.rb
+++ b/Library/Homebrew/global.rb
@@ -9,6 +9,7 @@ require "pp"
 
 require_relative "load_path"
 
+require "rubygems"
 require "active_support/core_ext/object/blank"
 require "active_support/core_ext/numeric/time"
 require "active_support/core_ext/array/access"
diff --git a/Library/Homebrew/test/cask/cmd/style_spec.rb b/Library/Homebrew/test/cask/cmd/style_spec.rb
index e3e5d50407..447a465f58 100644
--- a/Library/Homebrew/test/cask/cmd/style_spec.rb
+++ b/Library/Homebrew/test/cask/cmd/style_spec.rb
@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
 require "open3"
-require "rubygems"
 
 require_relative "shared_examples/invalid_option"
 
diff --git a/Library/Homebrew/test/support/helper/spec/shared_context/integration_test.rb b/Library/Homebrew/test/support/helper/spec/shared_context/integration_test.rb
index f7731bbd54..0a28b8b558 100644
--- a/Library/Homebrew/test/support/helper/spec/shared_context/integration_test.rb
+++ b/Library/Homebrew/test/support/helper/spec/shared_context/integration_test.rb
@@ -88,7 +88,6 @@ RSpec.shared_context "integration test" do
         "-I", $LOAD_PATH.join(File::PATH_SEPARATOR)
       ]
       if ENV["HOMEBREW_TESTS_COVERAGE"]
-        require "rubygems"
         simplecov_spec = Gem.loaded_specs["simplecov"]
         specs = [simplecov_spec]
         simplecov_spec.runtime_dependencies.each do |dep|