In January 2025, Philipp Krüger focused on stabilizing test environments for Ethereum’s execution-specs and execution-spec-tests repositories. He addressed persistent test flakiness by refining test configurations, specifically aligning wallet balances and gas prices with EIPs 2537, 7002, 7251, and 7702. Using Python and his expertise in Ethereum development and smart contract testing, Philipp’s targeted bug fixes enabled deterministic external testnet runs and improved continuous integration reliability. His work did not introduce new features but provided depth by expanding test coverage and supporting safer deployments, ensuring that test infrastructure for external testnets operated consistently and predictably across both repositories.