(2026-R39) Version updates

Note: Your clusters might not have these versions available. Rollouts are already in progress when we publish the release notes, and can take multiple days to complete across all Google Cloud zones.

• Version 1.35.8-gke.1036000 is now the default version for cluster creation in the Regular channel.
• The following versions are now available in the Regular channel:
• 1.34.11-gke.1044000
• 1.35.8-gke.1225000
• 1.36.4-gke.1082000
• The following versions are no longer available in the Regular channel:
• 1.34.10-gke.1236000
• 1.35.7-gke.1222000
• 1.36.3-gke.1640000 is deprecated in the Regular channel. This version will be removed in 90 days, or at the end of support, if sooner.
• Clusters in this channel running the listed minor version have new general auto-upgrade targets. GKE can upgrade control planes and nodes to the following new versions with this release:
• GKE upgrades clusters to the following new minor versions if there are no factors, such as maintenance exclusions or deprecated APIs, preventing upgrades:
• 1.33 to 1.34.10-gke.1328000
• 1.34 to 1.35.8-gke.1036000
• GKE upgrades clusters to the following new patch versions if no minor version upgrade is available, or if the cluster has