The UK State Pension will remain payable worldwide following our departure from the EU. We have now reached agreement with the EU to maintain State Pension up-rating for those covered by the Withdrawal Agreement, subject to reciprocity. This information can be found here: https://www.gov.uk/government/publications/safeguarding-the-position-of-eu-citizens-in-the-uk-and-uk-nationals-in-the-eu
For UK State Pension recipients living in the EU on the specified date, this includes those who are already receiving their UK State Pension as well as future UK State Pension recipients. We will wish to discuss State Pension up-rating for individuals not covered by the Withdrawal Agreement in future talks. We are currently in discussion with the EEA-EFTA states (Norway, Iceland, and Liechtenstein) and Switzerland on agreements to protect the rights of UK nationals living in those countries and their nationals living in the UK.