wget https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.1.tar.gz
tar xvf ruby-2.3.1.tar.gz
cd ruby-2.3.1/
./configure --prefix=/home/myaccount/
make
make install

$ruby -v
ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-linux]