diff --git a/Library/Homebrew/test/cask/download_spec.rb b/Library/Homebrew/test/cask/download_spec.rb
index 532cecbd10..5fb0f0cbe0 100644
--- a/Library/Homebrew/test/cask/download_spec.rb
+++ b/Library/Homebrew/test/cask/download_spec.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 module Cask
-  describe Download, :cask do
+  RSpec.describe Download, :cask do
     describe "#verify_download_integrity" do
       subject(:verification) { described_class.new(cask).verify_download_integrity(downloaded_path) }
 
diff --git a/Library/Homebrew/test/dev-cmd/audit_spec.rb b/Library/Homebrew/test/dev-cmd/audit_spec.rb
index 1c95aa58a3..4b85beadbe 100644
--- a/Library/Homebrew/test/dev-cmd/audit_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/audit_spec.rb
@@ -17,7 +17,7 @@ module Count
 end
 
 module Homebrew
-  describe FormulaTextAuditor do
+  RSpec.describe FormulaTextAuditor do
     alias_matcher :have_data, :be_data
     alias_matcher :have_end, :be_end
     alias_matcher :have_trailing_newline, :be_trailing_newline
@@ -56,7 +56,7 @@ module Homebrew
     end
   end
 
-  describe FormulaAuditor do
+  RSpec.describe FormulaAuditor do
     let(:dir) { mktmpdir }
     let(:foo_version) { Count.increment }
     let(:formula_subpath) { "Formula/foo#{foo_version}.rb" }
diff --git a/Library/Homebrew/test/formula_free_port_spec.rb b/Library/Homebrew/test/formula_free_port_spec.rb
index 834346c649..d3e907825a 100644
--- a/Library/Homebrew/test/formula_free_port_spec.rb
+++ b/Library/Homebrew/test/formula_free_port_spec.rb
@@ -4,7 +4,7 @@ require "socket"
 require "formula_free_port"
 
 module Homebrew
-  describe FreePort do
+  RSpec.describe FreePort do
     include described_class
 
     describe "#free_port" do
diff --git a/Library/Homebrew/test/rubocops/shell_commands_spec.rb b/Library/Homebrew/test/rubocops/shell_commands_spec.rb
index 4011d19968..6c464f3e83 100644
--- a/Library/Homebrew/test/rubocops/shell_commands_spec.rb
+++ b/Library/Homebrew/test/rubocops/shell_commands_spec.rb
@@ -5,7 +5,7 @@ require "rubocops/shell_commands"
 module RuboCop
   module Cop
     module Homebrew
-      describe ShellCommands do
+      ::RSpec.describe ShellCommands do
         subject(:cop) { described_class.new }
 
         context "when auditing shell commands" do
@@ -213,7 +213,7 @@ module RuboCop
         end
       end
 
-      describe ExecShellMetacharacters do
+      ::RSpec.describe ExecShellMetacharacters do
         subject(:cop) { described_class.new }
 
         context "when auditing exec calls" do
diff --git a/Library/Homebrew/test/spec_helper.rb b/Library/Homebrew/test/spec_helper.rb
index d5e0f035ec..f158f47e44 100644
--- a/Library/Homebrew/test/spec_helper.rb
+++ b/Library/Homebrew/test/spec_helper.rb
@@ -67,6 +67,7 @@ RSpec.configure do |config|
 
   config.raise_errors_for_deprecations!
   config.warnings = true
+  config.disable_monkey_patching!
 
   config.filter_run_when_matching :focus