diff --git a/go_modules/lib/dependabot/go_modules/metadata_finder.rb b/go_modules/lib/dependabot/go_modules/metadata_finder.rb
index 35c992078b..e5e007a8d7 100644
--- a/go_modules/lib/dependabot/go_modules/metadata_finder.rb
+++ b/go_modules/lib/dependabot/go_modules/metadata_finder.rb
@@ -1,6 +1,8 @@
-# typed: true
+# typed: strict
 # frozen_string_literal: true
 
+require "sorbet-runtime"
+
 require "dependabot/metadata_finders"
 require "dependabot/metadata_finders/base"
 require "dependabot/go_modules/path_converter"
@@ -8,8 +10,11 @@
 module Dependabot
   module GoModules
     class MetadataFinder < Dependabot::MetadataFinders::Base
+      extend T::Sig
+
       private
 
+      sig { override.returns(T.nilable(Source)) }
       def look_up_source
         url = Dependabot::GoModules::PathConverter.git_url_for_path(dependency.name)
         Source.from_url(url) if url