diff --git a/README.md b/README.md
index e612f401..95361c0f 100644
--- a/README.md
+++ b/README.md
@@ -16,12 +16,12 @@ Hadoop-2.6.0及以上版本
 ## 安装方法
 
 ### 获取 hadoop-cos 插件
-下载地址：[hadoop-cos 插件](https://github.com/tencentyun/hadoop-cos)
+下载地址：[hadoop-cos 插件](https://github.com/tencentyun/hadoop-cos/releases)
 
 
 ### 安装hadoop-cos插件
 
-1. 将dep目录下的hadoop-cos-X.X.X-shaded.jar 拷贝到 `$HADOOP_HOME/share/hadoop/tools/lib`下。
+1. 将hadoop-cos-{hadoop.version}-x.x.x.jar和cos_api-bundle-5.x.x.jar 拷贝到 `$HADOOP_HOME/share/hadoop/tools/lib`下。
 
 NOTE: 根据hadoop的具体版本选择对应的jar包，若dep目录中没有提供匹配版本的jar包，可自行通过修改pom文件中hadoop版本号，重新编译生成。
 
diff --git a/dep/hadoop-cos-2.6.5-shaded.jar b/dep/hadoop-cos-2.6.5-shaded.jar
deleted file mode 100644
index 403ce6bf..00000000
Binary files a/dep/hadoop-cos-2.6.5-shaded.jar and /dev/null differ
diff --git a/dep/hadoop-cos-2.7.5-shaded.jar b/dep/hadoop-cos-2.7.5-shaded.jar
deleted file mode 100644
index d61a867d..00000000
Binary files a/dep/hadoop-cos-2.7.5-shaded.jar and /dev/null differ
diff --git a/dep/hadoop-cos-2.8.5-shaded.jar b/dep/hadoop-cos-2.8.5-shaded.jar
deleted file mode 100644
index 86d7de74..00000000
Binary files a/dep/hadoop-cos-2.8.5-shaded.jar and /dev/null differ
diff --git a/pom.xml b/pom.xml
index 065e12e2..e9965c63 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,9 +4,9 @@
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
-    <groupId>org.apache.hadoop</groupId>
+    <groupId>com.qcloud.cos</groupId>
     <artifactId>hadoop-cos</artifactId>
-    <version>3.1.0</version>
+    <version>${hadoop.version}-5.8.4</version>
     <packaging>jar</packaging>
 
     <name>Apache Hadoop Tencent Qcloud COS Support</name>
@@ -20,7 +20,7 @@
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>
         <hadoop.version>3.1.0</hadoop.version>
-        <cos_api.version>5.6.18</cos_api.version>
+        <cos_api.version>5.6.19</cos_api.version>
         <google.guava.version>24.1.1-jre</google.guava.version>
         <commons_lang3.version>3.1</commons_lang3.version>
         <junit.version>4.8</junit.version>
diff --git a/src/main/java/org/apache/hadoop/fs/CosNativeFileSystemStore.java b/src/main/java/org/apache/hadoop/fs/CosNativeFileSystemStore.java
index bf5ef400..3e2493c4 100644
--- a/src/main/java/org/apache/hadoop/fs/CosNativeFileSystemStore.java
+++ b/src/main/java/org/apache/hadoop/fs/CosNativeFileSystemStore.java
@@ -407,7 +407,7 @@ public int compare(PartETag o1, PartETag o2) {
     }
 
     private FileMetadata QueryObjectMetadata(String key) throws IOException {
-        LOG.info("Query Object metadata....");
+        LOG.debug("Query Object metadata. cos key: {}.", key);
         GetObjectMetadataRequest getObjectMetadataRequest =
                 new GetObjectMetadataRequest(bucketName, key);