During June 2025, Dennis Heineman focused on improving the upgrade experience for Symfony developers by addressing a targeted bug in the symfony/symfony repository. Heineman corrected deprecation messages within the WebProfilerBundle’s routing configuration, ensuring that file extension references aligned with recommended import practices. By refining migration guidance from XML to PHP configurations, he reduced confusion for teams transitioning their codebases. His work involved PHP and configuration management, emphasizing clarity and maintainability in upgrade documentation. Although the contribution was limited to a single bug fix, it demonstrated attention to detail and a practical approach to supporting developer onboarding and framework migration.