diff --git a/src/main/java/com/ffii/tsms/modules/project/entity/ProjectTask.kt b/src/main/java/com/ffii/tsms/modules/project/entity/ProjectTask.kt
index 820df0c..3715a43 100644
--- a/src/main/java/com/ffii/tsms/modules/project/entity/ProjectTask.kt
+++ b/src/main/java/com/ffii/tsms/modules/project/entity/ProjectTask.kt
@@ -11,7 +11,7 @@ open class ProjectTask : IdEntity<Long>() {
     @ManyToOne
     open var project: Project? = null
 
-    @ManyToOne
+    @ManyToOne(cascade = [CascadeType.ALL])
     @JoinColumn(name = "milestoneId")
     open var milestone: Milestone? = null