CMake developer team in Kitware Inc provides APT repositiory. It allows you to install latest CMake via apt-get.

If you are using a minimal Ubuntu image or a Docker image, you may need to install the following packages:

sudo apt-get update
sudo apt-get install apt-transport-https ca-certificates gnupg
software-properties-common wget

Obtain a copy of our signing key:

wget -qO - https://apt.kitware.com/keys/kitware-archive-latest.asc | sudo apt-key add -

Add the repository to your sources list and update.

For Ubuntu Bionic Beaver (18.04):

sudo apt-add-repository 'deb https://apt.kitware.com/ubuntu/ bionic main'

sudo apt-get update

For Ubuntu Xenial Xerus (16.04):

sudo apt-add-repository 'deb https://apt.kitware.com/ubuntu/ xenial main'
sudo apt-get update

Now call

sudo apt-get install cmake

Reference: https://stackoverflow.com/questions/49859457/how-to-reinstall-the-latest-cmake-version