diff --git a/Library/Homebrew/bundle/adder.rb b/Library/Homebrew/bundle/adder.rb
index 00914550cf..bcb698f98d 100644
--- a/Library/Homebrew/bundle/adder.rb
+++ b/Library/Homebrew/bundle/adder.rb
@@ -1,4 +1,4 @@
-# typed: true # rubocop:todo Sorbet/StrictSigil
+# typed: strict
 # frozen_string_literal: true
 
 require "bundle/brewfile"
@@ -9,6 +9,7 @@ module Homebrew
     module Adder
       module_function
 
+      sig { params(args: String, type: Symbol, global: T::Boolean, file: String).void }
       def add(*args, type:, global:, file:)
         brewfile = Brewfile.read(global:, file:)
         content = brewfile.input
diff --git a/Library/Homebrew/bundle/commands/check.rb b/Library/Homebrew/bundle/commands/check.rb
index fa5d31eebf..5f194c1144 100644
--- a/Library/Homebrew/bundle/commands/check.rb
+++ b/Library/Homebrew/bundle/commands/check.rb
@@ -1,4 +1,4 @@
-# typed: true # rubocop:todo Sorbet/StrictSigil
+# typed: strict
 # frozen_string_literal: true
 
 require "bundle/checker"
@@ -7,6 +7,10 @@ module Homebrew
   module Bundle
     module Commands
       module Check
+        sig {
+          params(global: T::Boolean, file: T.nilable(String), no_upgrade: T::Boolean, verbose: T::Boolean,
+                 quiet: T::Boolean).void
+        }
         def self.run(global: false, file: nil, no_upgrade: false, verbose: false, quiet: false)
           output_errors = verbose
           exit_on_first_error = !verbose
diff --git a/Library/Homebrew/bundle/skipper.rb b/Library/Homebrew/bundle/skipper.rb
index 349d3ceff8..f2788907a2 100644
--- a/Library/Homebrew/bundle/skipper.rb
+++ b/Library/Homebrew/bundle/skipper.rb
@@ -7,6 +7,7 @@ module Homebrew
   module Bundle
     module Skipper
       class << self
+        sig { params(entry: Dsl::Entry, silent: T::Boolean).returns(T::Boolean) }
         def skip?(entry, silent: false)
           require "bundle/brew_dumper"
 
diff --git a/Library/Homebrew/bundle/whalebrew_dumper.rb b/Library/Homebrew/bundle/whalebrew_dumper.rb
index 3ef74394fe..8f7edfd48e 100644
--- a/Library/Homebrew/bundle/whalebrew_dumper.rb
+++ b/Library/Homebrew/bundle/whalebrew_dumper.rb
@@ -1,23 +1,29 @@
-# typed: true # rubocop:todo Sorbet/StrictSigil
+# typed: strict
 # frozen_string_literal: true
 
 module Homebrew
   module Bundle
     module WhalebrewDumper
+      sig { void }
       def self.reset!
-        @images = nil
+        @images = T.let(nil, T.nilable(T::Array[String]))
       end
 
+      sig { returns(T::Array[T.nilable(String)]) }
       def self.images
         return [] unless Bundle.whalebrew_installed?
 
         odeprecated "`brew bundle` `whalebrew` support", "using `whalebrew` directly"
-        @images ||= `whalebrew list 2>/dev/null`.split("\n")
-                                                .reject { |line| line.start_with?("COMMAND ") }
-                                                .map { |line| line.split(/\s+/).last }
-                                                .uniq
+        @images ||= T.let(
+          `whalebrew list 2>/dev/null`.split("\n")
+                                      .reject { |line| line.start_with?("COMMAND ") }
+                                      .filter_map { |line| line.split(/\s+/).last }
+                                      .uniq,
+          T.nilable(T::Array[String]),
+        )
       end
 
+      sig { returns(String) }
       def self.dump
         images.map { |image| "whalebrew \"#{image}\"" }.join("\n")
       end
diff --git a/Library/Homebrew/extend/os/linux/bundle/skipper.rb b/Library/Homebrew/extend/os/linux/bundle/skipper.rb
index c7a4c2e65c..8ae8259c05 100644
--- a/Library/Homebrew/extend/os/linux/bundle/skipper.rb
+++ b/Library/Homebrew/extend/os/linux/bundle/skipper.rb
@@ -1,4 +1,4 @@
-# typed: true # rubocop:todo Sorbet/StrictSigil
+# typed: strict
 # frozen_string_literal: true
 
 require "cask/cask_loader"
@@ -27,6 +27,7 @@ module OS
             true
           end
 
+          sig { params(entry: Homebrew::Bundle::Dsl::Entry, silent: T::Boolean).returns(T::Boolean) }
           def skip?(entry, silent: false)
             if macos_only_entry?(entry) || macos_only_cask?(entry)
               unless silent
diff --git a/Library/Homebrew/head_software_spec.rb b/Library/Homebrew/head_software_spec.rb
index cb7498b713..c5a00919a0 100644
--- a/Library/Homebrew/head_software_spec.rb
+++ b/Library/Homebrew/head_software_spec.rb
@@ -1,14 +1,16 @@
-# typed: true # rubocop:todo Sorbet/StrictSigil
+# typed: strict
 # frozen_string_literal: true
 
 require "software_spec"
 
 class HeadSoftwareSpec < SoftwareSpec
+  sig { params(flags: T::Array[String]).void }
   def initialize(flags: [])
     super
     @resource.version(Version.new("HEAD"))
   end
 
+  sig { params(_filename: Pathname).returns(NilClass) }
   def verify_download_integrity(_filename)
     # no-op
   end
diff --git a/Library/Homebrew/software_spec.rb b/Library/Homebrew/software_spec.rb
index 0926444ec2..7463429257 100644
--- a/Library/Homebrew/software_spec.rb
+++ b/Library/Homebrew/software_spec.rb
@@ -38,7 +38,7 @@ class SoftwareSpec
     super()
 
     # Ensure this is synced with `initialize_dup` and `freeze` (excluding simple objects like integers and booleans)
-    @resource = Resource::Formula.new
+    @resource = T.let(Resource::Formula.new, Resource::Formula)
     @resources = {}
     @dependency_collector = DependencyCollector.new
     @bottle_specification = BottleSpecification.new
diff --git a/Library/Homebrew/test/head_software_spec_spec.rb b/Library/Homebrew/test/head_software_spec_spec.rb
index 4e1d1021bc..c67314fe17 100644
--- a/Library/Homebrew/test/head_software_spec_spec.rb
+++ b/Library/Homebrew/test/head_software_spec_spec.rb
@@ -10,6 +10,6 @@ RSpec.describe HeadSoftwareSpec do
   end
 
   specify "#verify_download_integrity" do
-    expect(head_spec.verify_download_integrity(Object.new)).to be_nil
+    expect(head_spec.verify_download_integrity(Pathname.new("head.zip"))).to be_nil
   end
 end