Runners below the minimum supported version will be blocked from registering and executing jobs during brownout windows starting June 29 on github.com. If your fleet includes older self-hosted runners — particularly in air-gapped or slow-release environments — you have about a week to get them current before the first brownout hits. Full enforcement lands July 31, so this is a hard deadline, not a soft nudge. Teams with automated runner provisioning should check that their base images pull a recent enough Actions runner release; teams managing runners manually have the shortest window to act.