diff --git a/Library/Homebrew/dev-cmd/pr-pull.rb b/Library/Homebrew/dev-cmd/pr-pull.rb
index a191bf2aa8..80a75e5703 100644
--- a/Library/Homebrew/dev-cmd/pr-pull.rb
+++ b/Library/Homebrew/dev-cmd/pr-pull.rb
@@ -212,11 +212,11 @@ module Homebrew
     trailers = [trailers + co_author_trailers].flatten.uniq.compact
 
     # Apply the patch series but don't commit anything yet.
-    Utils::Git.cherry_pick!(git_repo, "--no-commit", *commits, verbose: verbose, resolve: resolve)
+    Utils::Git.cherry_pick!(git_repo.pathname, "--no-commit", *commits, verbose: verbose, resolve: resolve)
 
     # Determine the bump subject by comparing the original state of the tree to its current state.
     package_file = git_repo.pathname / file
-    old_package = Utils::Git.file_at_commit(git_repo, file, "#{commits.first}^")
+    old_package = Utils::Git.file_at_commit(git_repo.pathname, file, "#{commits.first}^")
     new_package = package_file.read
     bump_subject = determine_bump_subject(old_package, new_package, package_file, reason: reason)
 
@@ -229,7 +229,8 @@ module Homebrew
 
   # TODO: fix test in `test/dev-cmd/pr-pull_spec.rb` and assume `cherry_picked: false`.
   def self.autosquash!(original_commit, tap:, reason: "", verbose: false, resolve: false, cherry_picked: true)
-    original_head = tap.git_repo.head_ref
+    git_repo = tap.git_repo
+    original_head = git_repo.head_ref
 
     commits = Utils.safe_popen_read("git", "-C", tap.path, "rev-list",
                                     "--reverse", "#{original_commit}..HEAD").lines.map(&:strip)
@@ -269,15 +270,15 @@ module Homebrew
       files = commits_to_files[commit]
       if files.length == 1 && files_to_commits[files.first].length == 1
         # If there's a 1:1 mapping of commits to files, just cherry pick and (maybe) reword.
-        reword_package_commit(commit, files.first, git_repo: tap.git_repo, reason: reason, verbose: verbose,
-                              resolve: resolve)
+        reword_package_commit(
+          commit, files.first, git_repo: git_repo, reason: reason, verbose: verbose, resolve: resolve
+        )
         processed_commits << commit
       elsif files.length == 1 && files_to_commits[files.first].length > 1
         # If multiple commits modify a single file, squash them down into a single commit.
         file = files.first
         commits = files_to_commits[file]
-        squash_package_commits(commits, file, git_repo: tap.git_repo, reason: reason, verbose: verbose,
-                               resolve: resolve)
+        squash_package_commits(commits, file, git_repo: git_repo, reason: reason, verbose: verbose, resolve: resolve)
         processed_commits += commits
       else
         # We can't split commits (yet) so just raise an error.
@@ -483,7 +484,7 @@ module Homebrew
               autosquash!(original_commit, tap: tap, cherry_picked: !args.no_cherry_pick?,
                           verbose: args.verbose?, resolve: args.resolve?, reason: args.message)
             end
-            signoff!(tap.git_repo, pull_request: pr, dry_run: args.dry_run?) unless args.clean?
+            signoff!(git_repo, pull_request: pr, dry_run: args.dry_run?) unless args.clean?
           end
 
           unless formulae_need_bottles?(tap, original_commit, pr_labels, args: args)
diff --git a/Library/Homebrew/extend/git_repository.rbi b/Library/Homebrew/extend/git_repository.rbi
deleted file mode 100644
index 002eda5ea8..0000000000
--- a/Library/Homebrew/extend/git_repository.rbi
+++ /dev/null
@@ -1,10 +0,0 @@
-# typed: strict
-
-class GitRepository < SimpleDelegator
-  include Kernel
-
-  # This is a workaround to enable `alias pathname __getobj__`
-  # @see https://github.com/sorbet/sorbet/issues/2378#issuecomment-569474238
-  sig { returns(Pathname) }
-  def __getobj__; end
-end
diff --git a/Library/Homebrew/extend/git_repository.rb b/Library/Homebrew/git_repository.rb
similarity index 93%
rename from Library/Homebrew/extend/git_repository.rb
rename to Library/Homebrew/git_repository.rb
index 9a33202c78..ba5aab4024 100644
--- a/Library/Homebrew/extend/git_repository.rb
+++ b/Library/Homebrew/git_repository.rb
@@ -4,13 +4,19 @@
 require "utils/git"
 require "utils/popen"
 
-# Extensions to {Pathname} for querying Git repository information.
+# Given a {Pathname}, provides methods for querying Git repository information.
 # @see Utils::Git
 # @api private
-class GitRepository < SimpleDelegator
+class GitRepository
   extend T::Sig
 
-  alias pathname __getobj__
+  sig { returns(Pathname) }
+  attr_reader :pathname
+
+  sig { params(pathname: Pathname).void }
+  def initialize(pathname)
+    @pathname = pathname
+  end
 
   sig { returns(T::Boolean) }
   def git_repo?
diff --git a/Library/Homebrew/global.rb b/Library/Homebrew/global.rb
index 3c3cecdb2d..071eba618a 100644
--- a/Library/Homebrew/global.rb
+++ b/Library/Homebrew/global.rb
@@ -131,7 +131,7 @@ end
 
 require "context"
 require "extend/array"
-require "extend/git_repository"
+require "git_repository"
 require "extend/pathname"
 require "extend/predicable"
 require "extend/module"
diff --git a/Library/Homebrew/tap.rb b/Library/Homebrew/tap.rb
index ce98f055ab..cb4f3b080a 100644
--- a/Library/Homebrew/tap.rb
+++ b/Library/Homebrew/tap.rb
@@ -391,7 +391,7 @@ class Tap
       $stderr.ohai "#{name}: changed remote from #{remote} to #{requested_remote}" unless quiet
     end
 
-    current_upstream_head = git_repo.origin_branch_name
+    current_upstream_head = T.must(git_repo.origin_branch_name)
     return if requested_remote.blank? && git_repo.origin_has_branch?(current_upstream_head)
 
     args = %w[fetch]
@@ -400,7 +400,7 @@ class Tap
     safe_system "git", "-C", path, *args
     git_repo.set_head_origin_auto
 
-    new_upstream_head = git_repo.origin_branch_name
+    new_upstream_head = T.must(git_repo.origin_branch_name)
     return if new_upstream_head == current_upstream_head
 
     git_repo.rename_branch old: current_upstream_head, new: new_upstream_head
diff --git a/Library/Homebrew/utils/git_repository.rb b/Library/Homebrew/utils/git_repository.rb
index 1e4c1bedbb..2af21e2989 100644
--- a/Library/Homebrew/utils/git_repository.rb
+++ b/Library/Homebrew/utils/git_repository.rb
@@ -13,10 +13,9 @@ module Utils
     ).returns(T.nilable(String))
   }
   def self.git_head(repo = Pathname.pwd, length: nil, safe: true)
-    return git_short_head(repo, length: length) if length.present?
+    return git_short_head(repo, length: length) if length
 
-    repo = GitRepository.new(Pathname(repo))
-    repo.head_ref(safe: safe)
+    GitRepository.new(Pathname(repo)).head_ref(safe: safe)
   end
 
   # Gets a short commit hash of the HEAD commit.
@@ -28,8 +27,7 @@ module Utils
     ).returns(T.nilable(String))
   }
   def self.git_short_head(repo = Pathname.pwd, length: nil, safe: true)
-    repo = GitRepository.new(Pathname(repo))
-    repo.short_head_ref(length: length, safe: safe)
+    GitRepository.new(Pathname(repo)).short_head_ref(length: length, safe: safe)
   end
 
   # Gets the name of the currently checked-out branch, or HEAD if the repository is in a detached HEAD state.
@@ -40,8 +38,7 @@ module Utils
     ).returns(T.nilable(String))
   }
   def self.git_branch(repo = Pathname.pwd, safe: true)
-    repo = GitRepository.new(Pathname(repo))
-    repo.branch_name(safe: safe)
+    GitRepository.new(Pathname(repo)).branch_name(safe: safe)
   end
 
   # Gets the full commit message of the specified commit, or of the HEAD commit if unspecified.
@@ -53,7 +50,6 @@ module Utils
     ).returns(T.nilable(String))
   }
   def self.git_commit_message(repo = Pathname.pwd, commit: "HEAD", safe: true)
-    repo = GitRepository.new(Pathname(repo))
-    repo.commit_message(commit, safe: safe)
+    GitRepository.new(Pathname(repo)).commit_message(commit, safe: safe)
   end
 end