This notice announces the availability of FTA Circular C 4220.1G, the updated Third-Party Contracting Guidance, which supersedes C 4220.1F. The Federal Transit Administration received comments from 27 commenters after publishing the proposed circular on November 27, 2024, and the comment period closed December 27, 2024. The final circular incorporates statutory and regulatory changes including the Infrastructure Investment and Jobs Act, updated OMB Uniform Administrative Requirements at 2 CFR part 200, and revised DBE regulations. This is a procurement guidance document, not a NEPA environmental review, and contains no environmental impact analysis.12