diff --git a/scfs-api-core/src/main/java/com/czcb/scfs/api/core/cipher/DefaultSequencer.java b/scfs-api-core/src/main/java/com/czcb/scfs/api/core/cipher/DefaultSequencer.java
index d4a76fc..dfd76c7 100644
--- a/scfs-api-core/src/main/java/com/czcb/scfs/api/core/cipher/DefaultSequencer.java
+++ b/scfs-api-core/src/main/java/com/czcb/scfs/api/core/cipher/DefaultSequencer.java
@@ -3,7 +3,7 @@ package com.czcb.scfs.api.core.cipher;
 import com.czcb.scfs.api.core.util.DateTimes;
 
 import java.security.SecureRandom;
-import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicLong;
 
 /**
  * @author wangwei
@@ -11,7 +11,7 @@ import java.util.concurrent.atomic.AtomicInteger;
  */
 public class DefaultSequencer implements Sequencer {
     private final SecureRandom secureRandom = new SecureRandom();
-    private final AtomicInteger number = new AtomicInteger(1);
+    private final AtomicLong number = new AtomicLong(1);
 
     @Override
     public String next() {