diff --git a/artifacts.go b/artifacts.go
index 29f58cb19..af3451048 100644
--- a/artifacts.go
+++ b/artifacts.go
@@ -24,5 +24,5 @@ var CurrentArtifacts = ArtifactSet{
 	Debs: []DebianPackage{
 		{Name: "etcdpasswd", Owner: "cybozu-go", Repository: "etcdpasswd", Release: "v1.4.8"},
 	},
-	OSImage: OSImage{Channel: "stable", Version: "3815.2.5"},
+	OSImage: OSImage{Channel: "stable", Version: "3975.2.2"},
 }
diff --git a/artifacts_ignore.yaml b/artifacts_ignore.yaml
index 692271756..c78032b71 100644
--- a/artifacts_ignore.yaml
+++ b/artifacts_ignore.yaml
@@ -1,6 +1,3 @@
 images:
 - repository: ghcr.io/cybozu/etcd
   versions: ["3.5.15.1"]
-osImage:
-- channel: stable
-  versions: ["3975.2.0","3975.2.1","3975.2.2"]
diff --git a/debian/usr/bin/trigger-reboot-all-nodes b/debian/usr/bin/trigger-reboot-all-nodes
index 376448c8f..96c93df97 100755
--- a/debian/usr/bin/trigger-reboot-all-nodes
+++ b/debian/usr/bin/trigger-reboot-all-nodes
@@ -3,6 +3,7 @@ CKECLI_COMMAND="/usr/bin/ckecli"
 NECO_COMMAND="/usr/bin/neco"
 UNAME_COMMAND="/usr/bin/uname"
 YES_COMMAND="/usr/bin/yes"
+NOREBOOT_FILE="/tmp/no-reboot"
 
 ENVIROMENT=$(${NECO_COMMAND} config get env)
 if [ "$ENVIROMENT" != "dev" ]; then
@@ -10,6 +11,11 @@ if [ "$ENVIROMENT" != "dev" ]; then
     exit 0
 fi
 
+if [ -f ${NOREBOOT_FILE} ]; then
+    echo "The no-reboot file exists. Skipping reboot all nodes"
+    exit 0
+fi
+
 # Confirm that host is a learder
 HOSTNAME=$(${UNAME_COMMAND} -n)
 LEADER=$(${NECO_COMMAND} rebooter leader)