diff --git a/integration/http/src/test/java/io/seata/integration/http/MockResponse.java b/integration/http/src/test/java/io/seata/integration/http/MockResponse.java
index 95a6bbe0aecb638a6edfd75fe2b2f47b354761f8..eb40905a0720e114f4e50b4c9eb17fc6b5e30a44 100644
--- a/integration/http/src/test/java/io/seata/integration/http/MockResponse.java
+++ b/integration/http/src/test/java/io/seata/integration/http/MockResponse.java
@@ -31,7 +31,7 @@ public class MockResponse {
     }
 
     public String write(String content) throws IOException {
-        StringBuffer httpResponse = new StringBuffer();
+        StringBuilder httpResponse = new StringBuilder();
         httpResponse.append("HTTP/1.1 200 OK\n")
                 .append("Content-Type:application/json\n")
                 .append("\r\n")
diff --git a/rm-datasource/src/main/java/io/seata/rm/datasource/exec/BaseTransactionalExecutor.java b/rm-datasource/src/main/java/io/seata/rm/datasource/exec/BaseTransactionalExecutor.java
index ef22dd584f97ba2ab3dc67912b6fb3d996d109ed..fcec010c35a9c7f5671b8c7703a07a1cac20c78b 100644
--- a/rm-datasource/src/main/java/io/seata/rm/datasource/exec/BaseTransactionalExecutor.java
+++ b/rm-datasource/src/main/java/io/seata/rm/datasource/exec/BaseTransactionalExecutor.java
@@ -170,7 +170,7 @@ public abstract class BaseTransactionalExecutor<T, S extends Statement> implemen
         if (Objects.isNull(columnNameList) || columnNameList.isEmpty()) {
             return null;
         }
-        StringBuffer columnNamesStr = new StringBuffer();
+        StringBuilder columnNamesStr = new StringBuilder();
         for (int i = 0; i < columnNameList.size(); i++) {
             if (i > 0) {
                 columnNamesStr.append(" , ");
diff --git a/saga/seata-saga-engine/src/main/java/io/seata/saga/engine/sequence/SpringJvmUUIDSeqGenerator.java b/saga/seata-saga-engine/src/main/java/io/seata/saga/engine/sequence/SpringJvmUUIDSeqGenerator.java
index 48d3bdf502801aa8aef545b2dc216df28cd0334b..09b2a6fced7fce7e8d2f8f917a9a2b8bb4323a3b 100644
--- a/saga/seata-saga-engine/src/main/java/io/seata/saga/engine/sequence/SpringJvmUUIDSeqGenerator.java
+++ b/saga/seata-saga-engine/src/main/java/io/seata/saga/engine/sequence/SpringJvmUUIDSeqGenerator.java
@@ -32,11 +32,11 @@ public class SpringJvmUUIDSeqGenerator implements SeqGenerator {
     @Override
     public String generate(String entity, String ruleName, List<Object> shardingParameters) {
         String uuid = idGenerator.generateId().toString();
-        StringBuffer buf = new StringBuffer(uuid.length() - 4);
+        StringBuilder sb = new StringBuilder(uuid.length() - 4);
         for (String seg : uuid.split("-")) {
-            buf.append(seg);
+            sb.append(seg);
         }
-        return buf.toString();
+        return sb.toString();
     }
 
     @Override