1、查看当前版本

cmake --version

删除原来cmake版本，建立软连接，测试

yum remove cmake -y

2、下载获得cmake-3.9.2源码

wget  //cmake.org/files/v3.9/cmake-3.9.2.tar.gz

3、解压、安装新版本

tar -xvf cmake-3.9.2.tar.gz

cd cmake-3.9.2

./configure
sudo make && make install

【注】安装完后，执行cmake --version会报如下错误

CMake Error: Could not find CMAKE_ROOT !!!
CMake has most likely not been installed correctly.
Modules directory not found in
/Applications/CMake 2.8-11.app/Contents/bin
CMake Error: Error executing cmake::LoadCache(). Aborting.

【解决方法】

先执行：hash -r

然后再执行：cmake --version
完美解决