TL;DR
Bungie released Marathon update 1.036 on October 20, which starts the Vault Breaker event.
Marathon · official art via IGDBBungie released Marathon update 1.036 on October 20. This version, 1.1.9.5, starts the Vault Breaker event. PS5 players will see the download listed as Marathon update 1.036/01.036.000. Certain items within the Vault Breaker event are only available during its second and third weeks.
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