diff --git a/github/event_types.go b/github/event_types.go
index 0df3b30c381..6a6caf19ddb 100644
--- a/github/event_types.go
+++ b/github/event_types.go
@@ -858,8 +858,10 @@ type MergeGroup struct {
 //
 // GitHub API docs: https://docs.github.com/developers/webhooks-and-events/webhook-events-and-payloads#merge_group
 type MergeGroupEvent struct {
-	// The action that was performed. Currently, can only be checks_requested.
+	// The action that was performed. Possible values are: "checks_requested", "destroyed".
 	Action *string `json:"action,omitempty"`
+	// Reason is populated when the action is "destroyed". Possible values: "merged", "invalidated", "dequeued".
+	Reason *string `json:"reason,omitempty"`
 	// The merge group.
 	MergeGroup *MergeGroup `json:"merge_group,omitempty"`
 
diff --git a/github/event_types_test.go b/github/event_types_test.go
index 947f97026a9..35d57dbe303 100644
--- a/github/event_types_test.go
+++ b/github/event_types_test.go
@@ -10746,6 +10746,7 @@ func TestMergeGroupEvent_Marshal(t *testing.T) {
 
 	u := &MergeGroupEvent{
 		Action: Ptr("a"),
+		Reason: Ptr("r"),
 		MergeGroup: &MergeGroup{
 			HeadSHA:    Ptr("hs"),
 			HeadRef:    Ptr("hr"),
@@ -10886,6 +10887,7 @@ func TestMergeGroupEvent_Marshal(t *testing.T) {
 
 	want := `{
 		"action": "a",
+		"reason": "r",
 		"merge_group": {
 			"head_sha": "hs",
 			"head_ref": "hr",
diff --git a/github/github-accessors.go b/github/github-accessors.go
index 905dd80c8a2..56e478f1e78 100644
--- a/github/github-accessors.go
+++ b/github/github-accessors.go
@@ -14238,6 +14238,14 @@ func (m *MergeGroupEvent) GetOrg() *Organization {
 	return m.Org
 }
 
+// GetReason returns the Reason field if it's non-nil, zero value otherwise.
+func (m *MergeGroupEvent) GetReason() string {
+	if m == nil || m.Reason == nil {
+		return ""
+	}
+	return *m.Reason
+}
+
 // GetRepo returns the Repo field.
 func (m *MergeGroupEvent) GetRepo() *Repository {
 	if m == nil {
diff --git a/github/github-accessors_test.go b/github/github-accessors_test.go
index 8d69ad42e7e..d69c4847dd5 100644
--- a/github/github-accessors_test.go
+++ b/github/github-accessors_test.go
@@ -18445,6 +18445,17 @@ func TestMergeGroupEvent_GetOrg(tt *testing.T) {
 	m.GetOrg()
 }
 
+func TestMergeGroupEvent_GetReason(tt *testing.T) {
+	tt.Parallel()
+	var zeroValue string
+	m := &MergeGroupEvent{Reason: &zeroValue}
+	m.GetReason()
+	m = &MergeGroupEvent{}
+	m.GetReason()
+	m = nil
+	m.GetReason()
+}
+
 func TestMergeGroupEvent_GetRepo(tt *testing.T) {
 	tt.Parallel()
 	m := &MergeGroupEvent{}