diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..567609b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+build/
diff --git a/CMakeLists.txt b/CMakeLists.txt
index c840b11..c6303d7 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,12 +1,8 @@
-cmake_minimum_required(VERSION 3.10.2)
+cmake_minimum_required(VERSION 2.8.2)
 project(UnitreeMotorSDK_M80106)
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -O3")
 
-include_directories("include/")
-link_directories(
-    lib/
-)
-
-#example
+include_directories(include)
+link_directories(lib)
 add_executable(motorctrl example/main.cpp)
 target_link_libraries(motorctrl libUnitreeMotorSDK_M80106_Linux64.so)
diff --git a/README.md b/README.md
index 5546500..0e1797a 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,12 @@ support motor: GO-M8010-6 motor
 
 not support motor: A1 motor、 B1 motor (Check A1B1 branch for support)
 
+gcc >= 5.4.0 (for libUnitreeMotorSDK_M80106_Linux64.so)
+
+gcc >= 8.3.0 (for libUnitreeMotorSDK_M80106_Arm64.so) 
+
+run gcc -v  command to check your gcc version
+
 ### Build
 ```bash
 mkdir build
diff --git a/lib/libUnitreeMotorSDK_M80106_Arm64.so b/lib/libUnitreeMotorSDK_M80106_Arm64.so
index 576a40a..70c0f3e 100755
Binary files a/lib/libUnitreeMotorSDK_M80106_Arm64.so and b/lib/libUnitreeMotorSDK_M80106_Arm64.so differ
diff --git a/lib/libUnitreeMotorSDK_M80106_Linux64.so b/lib/libUnitreeMotorSDK_M80106_Linux64.so
index 553fe12..c748058 100755
Binary files a/lib/libUnitreeMotorSDK_M80106_Linux64.so and b/lib/libUnitreeMotorSDK_M80106_Linux64.so differ