diff --git a/demo/cos_demo.cpp b/demo/cos_demo.cpp
index 11d9aae..ee23381 100644
--- a/demo/cos_demo.cpp
+++ b/demo/cos_demo.cpp
@@ -284,7 +284,7 @@ void PutBucketACL(qcloud_cos::CosAPI& cos, const std::string& bucket_name) {
     // 2. 设置ACL配置(通过Header, 设置ACL可以通过Body、Header两种方式，但只能二选一，否则会有冲突)
     {
         qcloud_cos::PutBucketACLReq req(bucket_name);
-        req.SetXCosAcl("public-read-write");
+        req.SetXCosAcl("public-read");
 
         qcloud_cos::PutBucketACLResp resp;
         qcloud_cos::CosResult result = cos.PutBucketACL(req, &resp);
diff --git a/include/cos_defines.h b/include/cos_defines.h
index 02b8fcf..085115b 100644
--- a/include/cos_defines.h
+++ b/include/cos_defines.h
@@ -11,7 +11,7 @@
 
 namespace qcloud_cos {
 
-#define COS_CPP_SDK_VERSON "v5.5.13"
+#define COS_CPP_SDK_VERSON "v5.5.14"
 
 /// 路径分隔符
 const char kPathDelimiter[] = "/";
diff --git a/include/request/object_req.h b/include/request/object_req.h
index cdbe7fa..eee1552 100644
--- a/include/request/object_req.h
+++ b/include/request/object_req.h
@@ -271,7 +271,7 @@ class PutObjectReq : public ObjectReq {
     AddHeader("x-cos-storage-class", storage_class);
   }
 
-  /// 定义Object的ACL属性,有效值：private,public-read-write,public-read
+  /// 定义Object的ACL属性,有效值：default,private,public-read
   /// 默认值：private
   void SetXCosAcl(const std::string& str) { AddHeader("x-cos-acl", str); }
 
@@ -536,7 +536,7 @@ class InitMultiUploadReq : public ObjectReq {
     AddHeader("x-cos-storage-class", storage_class);
   }
 
-  /// 定义Object的ACL属性,有效值：private,public-read-write,public-read
+  /// 定义Object的ACL属性,有效值：default,private,public-read
   /// 默认值：private
   void SetXCosAcl(const std::string& str) { AddHeader("x-cos-acl", str); }
 
@@ -949,7 +949,7 @@ class PutObjectACLReq : public ObjectReq {
 
   virtual ~PutObjectACLReq() {}
 
-  /// 定义Object的ACL属性,有效值：private,public-read-write,public-read
+  /// 定义Object的ACL属性,有效值：default,private,public-read
   /// 默认值：private
   void SetXCosAcl(const std::string& str) { AddHeader("x-cos-acl", str); }
 
@@ -1118,7 +1118,7 @@ class PutObjectCopyReq : public ObjectReq {
     AddHeader("x-cos-storage-class", storage_class);
   }
 
-  /// 定义Object的ACL属性,有效值：private,public-read-write,public-read
+  /// 定义Object的ACL属性,有效值：default,private,public-read
   /// 默认值：private
   void SetXCosAcl(const std::string& str) { AddHeader("x-cos-acl", str); }
 
@@ -1212,7 +1212,7 @@ class CopyReq : public ObjectReq {
     AddHeader("x-cos-storage-class", storage_class);
   }
 
-  /// 定义Object的ACL属性,有效值：private,public-read-write,public-read
+  /// 定义Object的ACL属性,有效值：default,private,public-read
   /// 默认值：private
   void SetXCosAcl(const std::string& str) { AddHeader("x-cos-acl", str); }