diff --git a/Library/Homebrew/dev-cmd/bump-formula-pr.rb b/Library/Homebrew/dev-cmd/bump-formula-pr.rb
index a1a51c738e..12a4a636ad 100644
--- a/Library/Homebrew/dev-cmd/bump-formula-pr.rb
+++ b/Library/Homebrew/dev-cmd/bump-formula-pr.rb
@@ -467,7 +467,7 @@ module Homebrew
 
       sig {
         params(formula: Formula, tap_remote_repo: String, state: T.nilable(String),
-               version: T.nilable(String)).returns(T.nilable(T::Array[String]))
+               version: T.nilable(String)).void
       }
       def check_pull_requests(formula, tap_remote_repo, state: nil, version: nil)
         tap = formula.tap
diff --git a/Library/Homebrew/utils/github.rb b/Library/Homebrew/utils/github.rb
index 74fbe2afea..c934012d28 100644
--- a/Library/Homebrew/utils/github.rb
+++ b/Library/Homebrew/utils/github.rb
@@ -629,7 +629,17 @@ module GitHub
     pull_requests || []
   end
 
-  def self.check_for_duplicate_pull_requests(name, tap_remote_repo, file:, quiet:, state: nil, version: nil)
+  sig {
+    params(
+      name:            String,
+      tap_remote_repo: String,
+      file:            String,
+      quiet:           T::Boolean,
+      state:           T.nilable(String),
+      version:         T.nilable(String),
+    ).void
+  }
+  def self.check_for_duplicate_pull_requests(name, tap_remote_repo, file:, quiet: false, state: nil, version: nil)
     pull_requests = fetch_pull_requests(name, tap_remote_repo, state:, version:)
 
     pull_requests.select! do |pr|