diff --git a/pkg/operatingsystem/cos/git-reader.go b/pkg/operatingsystem/cos/git-reader.go
index 1ab86fc..8097d96 100644
--- a/pkg/operatingsystem/cos/git-reader.go
+++ b/pkg/operatingsystem/cos/git-reader.go
@@ -12,8 +12,7 @@ import (
 const (
 	// MilestoneMin is the lowest active milestone. Lower value milestones are not built. See
 	// https://cloud.google.com/container-optimized-os/docs/concepts/versioning.
-	// Set to 85 (despite deprecation to cover versions that are being upgraded).
-	MilestoneMin = 85
+	MilestoneMin = 93
 
 	milestonePrefix = "origin/release-R"
 	buildIDFormat   = "%d.%d.%d"