i would assume its the latest as i followed a tutorial using the following
OpenHAB Key and Source (remove brackets from http://):
wget -qO - ‘[https://]bintray.com/user/downloadSubjectPublicKey?username=openhab’ | sudo apt-key add -
echo “deb [http://]dl.bintray.com/openhab/apt-repo stable main” | sudo tee /etc/apt/sources.list.d/openhab.list