diff --git a/cosid-mongo/src/test/java/me/ahoo/cosid/mongo/MongoReactiveIdSegmentDistributorTest.java b/cosid-mongo/src/test/java/me/ahoo/cosid/mongo/MongoReactiveIdSegmentDistributorTest.java
index fe916bb71f..be28943d5c 100644
--- a/cosid-mongo/src/test/java/me/ahoo/cosid/mongo/MongoReactiveIdSegmentDistributorTest.java
+++ b/cosid-mongo/src/test/java/me/ahoo/cosid/mongo/MongoReactiveIdSegmentDistributorTest.java
@@ -21,6 +21,7 @@
 import me.ahoo.cosid.segment.IdSegmentDistributor;
 import me.ahoo.cosid.segment.IdSegmentDistributorDefinition;
 import me.ahoo.cosid.segment.IdSegmentDistributorFactory;
+import me.ahoo.cosid.segment.SegmentChainId;
 import me.ahoo.cosid.test.MockIdGenerator;
 import me.ahoo.cosid.test.segment.distributor.IdSegmentDistributorSpec;
 
@@ -41,6 +42,7 @@ class MongoReactiveIdSegmentDistributorTest extends IdSegmentDistributorSpec {
     void setup() {
         mongoDatabase = MongoClients.create(MongoLauncher.getConnectionString()).getDatabase("cosid_db");
         idSegmentInitializer = new MongoReactiveIdSegmentInitializer(mongoDatabase);
+        
         idSegmentInitializer.ensureCosIdCollection();
         distributorFactory =
             new MongoReactiveIdSegmentDistributorFactory(mongoDatabase, true);
@@ -75,4 +77,21 @@ public void nextMaxIdInParallel() {
         }).subscribeOn(Schedulers.parallel());
         StepVerifier.create(mono).verifyComplete();
     }
+    
+    @Test
+    public void batchNextMaxId() {
+        String namespace = MockIdGenerator.INSTANCE.generateAsString();
+        IdSegmentDistributorDefinition definition = new IdSegmentDistributorDefinition(namespace, "batchNextMaxId", 1, 1);
+        IdSegmentDistributor distributor = factory().create(definition);
+        var segmentChainId = new SegmentChainId(distributor);
+        for (int i = 0; i < 1000; i++) {
+            segmentChainId.generateAsString();
+        }
+        var mono = Mono.fromRunnable(() -> {
+            for (int i = 0; i < 1000; i++) {
+                segmentChainId.generateAsString();
+            }
+        }).subscribeOn(Schedulers.single());
+        StepVerifier.create(mono).verifyComplete();
+    }
 }
\ No newline at end of file
diff --git a/cosid-spring-boot-starter/src/main/java/me/ahoo/cosid/spring/boot/starter/segment/CosIdMongoSegmentAutoConfiguration.java b/cosid-spring-boot-starter/src/main/java/me/ahoo/cosid/spring/boot/starter/segment/CosIdMongoSegmentAutoConfiguration.java
index 7f9da2039b..10fcd66ee9 100644
--- a/cosid-spring-boot-starter/src/main/java/me/ahoo/cosid/spring/boot/starter/segment/CosIdMongoSegmentAutoConfiguration.java
+++ b/cosid-spring-boot-starter/src/main/java/me/ahoo/cosid/spring/boot/starter/segment/CosIdMongoSegmentAutoConfiguration.java
@@ -33,6 +33,7 @@
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Primary;
+import org.springframework.core.annotation.Order;
 
 /**
  * CosId Redis Segment AutoConfiguration.
@@ -54,6 +55,7 @@ public CosIdMongoSegmentAutoConfiguration(SegmentIdProperties segmentIdPropertie
         this.segmentIdProperties = segmentIdProperties;
     }
     
+    @Order(0)
     @Configuration
     @ConditionalOnClass(MongoClient.class)
     class Sync {
diff --git a/gradle.properties b/gradle.properties
index 4f220cde42..a4277e803b 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -11,7 +11,7 @@
 # limitations under the License.
 #
 group=me.ahoo.cosid
-version=2.5.1
+version=2.5.2
 description=Universal, flexible, high-performance distributed ID generator.
 website=https://github.com/Ahoo-Wang/CosId
 issues=https://github.com/Ahoo-Wang/CosId/issues