diff --git a/SPEC.md b/SPEC.md
index 0667986..bca0b84 100644
--- a/SPEC.md
+++ b/SPEC.md
@@ -34,6 +34,7 @@ The JSON below is the request-body example.
             "content_available" : false,
             "mutable_content" : false,
             "expiry" : 10,
+            "interruption": "active",
             "extend" : [{ "key": "url", "val": "..." }, { "key": "intent", "val": "..." }]
         },
         {
@@ -71,6 +72,7 @@ The request-body must have the `notifications` array. Table below shows the para
 |extend           |string array|extensible partition                     |-       |       |                                          |
 |identifier        |string      |notification identifier                    |-       |       |an optional value to identify notification|
 |push_type        |string      |apns-push-type                           |-       |alert  |only iOS(13.0+)                           |
+|interruption     |string      |the importance and delivery timing of a notification|-    |active |onlt iOS(15.0+)                   |
 
 The JSON below is the response-body example from Gaurun. In this case, the status is 200(OK).
 
diff --git a/buford/payload/aps.go b/buford/payload/aps.go
index 5ff4c1e..fffa521 100644
--- a/buford/payload/aps.go
+++ b/buford/payload/aps.go
@@ -30,6 +30,10 @@ type APS struct {
 	// Mutable is used for Service Extensions introduced in iOS 10.
 	MutableContent bool
 
+	// Interruption is the importance and delivery timing of a notification.
+	// The string values “passive”, “active”, “time-sensitive”, or “critical”
+	Interruption string
+
 	// Thread identifier to create notification groups in iOS 12 or newer.
 	ThreadID string
 }
@@ -96,6 +100,9 @@ func (a *APS) Map() map[string]interface{} {
 	if a.MutableContent {
 		aps["mutable-content"] = 1
 	}
+	if a.Interruption != "" {
+		aps["interruption-level"] = a.Interruption
+	}
 	if a.ThreadID != "" {
 		aps["thread-id"] = a.ThreadID
 	}
diff --git a/gaurun/apns_http2.go b/gaurun/apns_http2.go
index c60a9d7..84037e8 100644
--- a/gaurun/apns_http2.go
+++ b/gaurun/apns_http2.go
@@ -138,6 +138,7 @@ func NewApnsPayloadHttp2(req *RequestGaurunNotification) map[string]interface{}
 		Sound:            req.Sound,
 		ContentAvailable: req.ContentAvailable,
 		MutableContent:   req.MutableContent,
+		Interruption:     req.Interruption,
 	}
 
 	pm := p.Map()
diff --git a/gaurun/notification.go b/gaurun/notification.go
index 72c4eed..2a0f892 100644
--- a/gaurun/notification.go
+++ b/gaurun/notification.go
@@ -42,6 +42,7 @@ type RequestGaurunNotification struct {
 	MutableContent   bool         `json:"mutable_content,omitempty"`
 	Expiry           int          `json:"expiry,omitempty"`
 	Retry            int          `json:"retry,omitempty"`
+	Interruption     string       `json:"interruption,omitempty"`
 	Extend           []ExtendJSON `json:"extend,omitempty"`
 	// meta
 	ID uint64 `json:"seq_id,omitempty"`