diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4663047..7b2c4eb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,6 +6,7 @@ set(CMAKE_VERBOSE_MAKEFILE  ON)
 option(BUILD_UNITTEST "Build unittest" OFF)
 option(BUILD_DEMO "Build demo" ON)
 option(BUILD_SHARED_LIB "Build shared library" OFF)
+option(ENABLE_COVERAGE "Enable Coverage" OFF)
 
 if(APPLE)
     set(OS_TYPE "APPLE")
@@ -71,6 +72,11 @@ else()
     set(SYSTEM_LIBS stdc++ pthread)
 endif()
 
+if(ENABLE_COVERAGE)
+# coverage option
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fprofile-arcs -ftest-coverage")
+endif()
+
 add_subdirectory(src)
 
 if(BUILD_UNITTEST)
diff --git a/gen_lcov.sh b/gen_lcov.sh
index a04a384..eff79ca 100755
--- a/gen_lcov.sh
+++ b/gen_lcov.sh
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 workspace=`pwd`
-EXTRACT="${workspace}/*/op/* ${workspace}/*/util/* ${workspace}/*/request/*  ${workspace}/*/response/* ${workspace}/include"
+EXTRACT="${workspace}/src ${workspace}/include"
 # clear
 rm UTReport -rf
 rm UTResport.tar
diff --git a/include/cos_defines.h b/include/cos_defines.h
index 407f6d6..c1094e0 100644
--- a/include/cos_defines.h
+++ b/include/cos_defines.h
@@ -11,7 +11,7 @@
 
 namespace qcloud_cos {
 
-#define COS_CPP_SDK_VERSON "v5.5.9"
+#define COS_CPP_SDK_VERSON "v5.5.10"
 
 /// 路径分隔符
 const std::string kPathDelimiter = "/";