diff --git a/src/main/java/com/loafle/bridge/collector/Collector.java b/src/main/java/com/loafle/bridge/collector/Collector.java
index fb37cfb..dd8e04a 100644
--- a/src/main/java/com/loafle/bridge/collector/Collector.java
+++ b/src/main/java/com/loafle/bridge/collector/Collector.java
@@ -1,5 +1,8 @@
 package com.loafle.bridge.collector;
 
+import org.hibernate.annotations.Generated;
+import org.hibernate.annotations.GenerationTime;
+
 import javax.persistence.*;
 import java.util.Date;
 
@@ -32,7 +35,7 @@ public class Collector {
     @Column(columnDefinition = "TIMESTAMP DEFAULT CURRENT_TIMESTAMP", nullable = false)
     private Date installDate;
 
-    @Column(columnDefinition = "TIMESTAMP DEFAULT CURRENT_TIMESTAMP")
+    @Column(columnDefinition = "TIMESTAMP DEFAULT CURRENT_TIMESTAMP", nullable = false)
     private Date updateDate;
 
     public Collector() {