Upgrading Jenkins
There are two kinds of Jenkins releases: LTS Release and Weekly Release. The Jenkins Weekly Release contains new features and bug fixes, whereas the LTS (Long Term Support)Release are special releases that are considered stable over a period of 12 weeks. It's recommended that you always choose an LTS Release for your Jenkins server:

Jenkins download page
Jenkins by itself notifies you when there is a newer version available (provided your Jenkins server has access to the internet), as shown in the following screenshot:

Jenkins notification about the availability of a new version
Upgrading Jenkins running on Tomcat Server
In the following section, we will learn to update Jenkins running inside a servlet (Apache Tomcat). Follow the given steps:
- Log in to your Apache Tomcat server machine as the root user.
- Download the latest (LTS) version of
jenkins.war
under the/tmp
directory using the following command:
cd /tmp wget http://mirrors.jenkins.io/war-stable/latest...