diff --git a/nuget/lib/dependabot/nuget/update_checker.rb b/nuget/lib/dependabot/nuget/update_checker.rb
index 28b3a26eeb2..8eaa943b28d 100644
--- a/nuget/lib/dependabot/nuget/update_checker.rb
+++ b/nuget/lib/dependabot/nuget/update_checker.rb
@@ -42,7 +42,7 @@ def lowest_security_fix_version
         lowest_security_fix_version_details&.fetch(:version)
       end
 
-      sig { override.returns(T.nilable(Dependabot::Version)) }
+      sig { override.returns(T.nilable(Dependabot::Nuget::Version)) }
       def lowest_resolvable_security_fix_version
         return nil if version_comes_from_multi_dependency_property?