The European Stability Mechanism (ESM) has been instrumental in safeguarding the financial stability of the Euro area and of its Member States. This article looks at the tumultuous process of reforming the ESM. It analyses the main changes that would be brought about by the draft revised ESM Treaty, whose text was agreed upon in June 2019 and finalized in December 2020. These concern the ESM’s purposes and operations; the procedure for granting stability support to a Euro area Member State; precautionary financial assistance instruments; single-limb collective action clauses; and the common backstop to the Single Resolution Fund. The focus then shifts to the changes agreed upon in response to the COVID-19 crisis. A new credit line has been introduced, the Pandemic Crisis Support, which builds on an existing instrument. It is argued that the reforms posited in the draft revised ESM Treaty would plug important gaps in the framework of the Economic and Monetary Union. Nevertheless, some of the ESM’s underlying vulnerabilities would remain, notably as regards its governance, the status of non-Euro area Member States, and the framework for its transparency and accountability. A more comprehensive reform could have taken place, which would have improved upon the overall structure of the Euro area.