diff --git a/node/acme/manager.go b/node/acme/manager.go
index 1675dac7e380f33676e3213e726b04d28577cd15..45c8f32f978da26f8d1fc1185de972e4e032a885 100644
--- a/node/acme/manager.go
+++ b/node/acme/manager.go
@@ -28,7 +28,7 @@ const (
 var (
 	checkIntervalSeconds = 9600
 	renewalTimeout       = 1800 * time.Second
-	renewalDays          = 15
+	renewalDays          = 22
 )
 
 type Cert struct {