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Valkey 9.0.0 release notes

Upgrade urgency levels

  • LOW: No need to upgrade unless there are new features you want to use.
  • MODERATE: Program an upgrade of the server, but it’s not urgent.
  • HIGH: There is a critical bug that may affect a subset of users. Upgrade!
  • CRITICAL: There is a critical bug affecting MOST USERS. Upgrade ASAP.
  • SECURITY: There are security fixes in the release.

Valkey 9.0.0 GA - Released October 21, 2025

Upgrade urgency LOW.

This is the first release of Valkey 9.0 which includes stability, bug fixes, and incremental improvements over the third release candidate.

Bug fixes

  • HSETEX with FXX should not create an object if it does not exist (#2716)
  • Fix crash when aborting a slot migration while child snapshot is active (#2721)
  • Fix double MOVED reply on unblock at failover (#2734)
  • Fix memory leak with CLIENT LIST/KILL duplicate filters (#2362)
  • Fix incorrect accounting after completed atomic slot migration (#2749)
  • Fix Lua VM crash after FUNCTION FLUSH ASYNC + FUNCTION LOAD (#1826), (#2750)
  • Fix invalid memory address caused by hashtable shrinking during safe iteration (#2753)