diff --git a/Library/Homebrew/cask/dsl.rb b/Library/Homebrew/cask/dsl.rb
index d41c2df75a074..a4819be61d793 100644
--- a/Library/Homebrew/cask/dsl.rb
+++ b/Library/Homebrew/cask/dsl.rb
@@ -345,7 +345,7 @@ def livecheckable?
       define_method(klass.dsl_key) do |*args, **kwargs|
         T.bind(self, DSL)
         if [*artifacts.map(&:class), klass].include?(Artifact::StageOnly) &&
-           (artifacts.map(&:class) & ACTIVATABLE_ARTIFACT_CLASSES).any?
+           artifacts.map(&:class).intersect?(ACTIVATABLE_ARTIFACT_CLASSES)
           raise CaskInvalidError.new(cask, "'stage_only' must be the only activatable artifact.")
         end
 
diff --git a/Library/Homebrew/cleanup.rb b/Library/Homebrew/cleanup.rb
index fcd1d87dfa0f4..ed485da4bd446 100644
--- a/Library/Homebrew/cleanup.rb
+++ b/Library/Homebrew/cleanup.rb
@@ -231,7 +231,7 @@ def self.skip_clean_formula?(formula)
       return false if no_cleanup_formula.blank?
 
       @skip_clean_formulae ||= no_cleanup_formula.split(",")
-      @skip_clean_formulae.include?(formula.name) || (@skip_clean_formulae & formula.aliases).present?
+      @skip_clean_formulae.include?(formula.name) || @skip_clean_formulae.intersect?(formula.aliases)
     end
 
     def self.periodic_clean_due?
diff --git a/Library/Homebrew/diagnostic.rb b/Library/Homebrew/diagnostic.rb
index 9b629ccf0e2ce..358f1a200f6ae 100644
--- a/Library/Homebrew/diagnostic.rb
+++ b/Library/Homebrew/diagnostic.rb
@@ -691,7 +691,7 @@ def check_for_non_prefixed_coreutils
         return unless coreutils.any_version_installed?
 
         gnubin = %W[#{coreutils.opt_libexec}/gnubin #{coreutils.libexec}/gnubin]
-        return if (paths & gnubin).empty?
+        return if !paths.intersect?(gnubin)
 
         <<~EOS
           Putting non-prefixed coreutils in your path can cause GMP builds to fail.
diff --git a/Library/Homebrew/extend/os/mac/diagnostic.rb b/Library/Homebrew/extend/os/mac/diagnostic.rb
index f3d43a7db0015..0e74b6da65c4b 100644
--- a/Library/Homebrew/extend/os/mac/diagnostic.rb
+++ b/Library/Homebrew/extend/os/mac/diagnostic.rb
@@ -96,7 +96,7 @@ def check_for_non_prefixed_findutils
 
         gnubin = %W[#{findutils.opt_libexec}/gnubin #{findutils.libexec}/gnubin]
         default_names = Tab.for_name("findutils").with? "default-names"
-        return if !default_names && (paths & gnubin).empty?
+        return if !default_names && !paths.intersect?(gnubin)
 
         <<~EOS
           Putting non-prefixed findutils in your path can cause python builds to fail.
diff --git a/Library/Homebrew/rubocops/service.rb b/Library/Homebrew/rubocops/service.rb
index 29065b26aa26a..4560cbb4a693a 100644
--- a/Library/Homebrew/rubocops/service.rb
+++ b/Library/Homebrew/rubocops/service.rb
@@ -33,7 +33,7 @@ def audit_formula(_node, _class_node, _parent_class_node, body_node)
 
           # NOTE: Solving the first problem here might solve the second one too
           # so we don't show both of them at the same time.
-          if (method_calls.keys & REQUIRED_METHOD_CALLS).empty?
+          if !method_calls.keys.intersect?(REQUIRED_METHOD_CALLS)
             offending_node(service_node)
             problem "Service blocks require `run` or `name` to be defined."
           elsif !method_calls.key?(:run)
diff --git a/Library/Homebrew/test/spec_helper.rb b/Library/Homebrew/test/spec_helper.rb
index 3b1765157098e..6af17fcd03854 100644
--- a/Library/Homebrew/test/spec_helper.rb
+++ b/Library/Homebrew/test/spec_helper.rb
@@ -217,7 +217,7 @@ def find_files
     @__stdin = $stdin.clone
 
     begin
-      if (example.metadata.keys & [:focus, :byebug]).empty? && !ENV.key?("HOMEBREW_VERBOSE_TESTS")
+      if !example.metadata.keys.intersect?([:focus, :byebug]) && !ENV.key?("HOMEBREW_VERBOSE_TESTS")
         $stdout.reopen(File::NULL)
         $stderr.reopen(File::NULL)
       else
diff --git a/Library/Homebrew/utils/curl.rb b/Library/Homebrew/utils/curl.rb
index 1377fa709faec..85daf25eab756 100644
--- a/Library/Homebrew/utils/curl.rb
+++ b/Library/Homebrew/utils/curl.rb
@@ -229,7 +229,7 @@ def curl_headers(*args, wanted_headers: [], **options)
           if request_args.empty?
             # If we didn't get any wanted header yet, retry using `GET`.
             next if wanted_headers.any? &&
-                    parsed_output.fetch(:responses).none? { |r| (r.fetch(:headers).keys & wanted_headers).any? }
+                    parsed_output.fetch(:responses).none? { |r| r.fetch(:headers).keys.intersect?(wanted_headers) }
 
             # Some CDNs respond with 400 codes for `HEAD` but resolve with `GET`.
             next if (400..499).cover?(parsed_output.fetch(:responses).last&.fetch(:status_code).to_i)