Jenkins Update

jenkins-upgrade.sh

# for OSS Version in Ubuntu
sudo wget -q -O - http://pkg.jenkins-ci.org/debian/jenkins-ci.org.key | sudo apt-key add -
sudo deb http://pkg.jenkins-ci.org/debian binary/
echo "deb http://pkg.jenkins-ci.org/debian-stable binary/" >> /etc/apt/sources.list
sudo apt-get install jenkins

# For Cloudbees Version in CentOs
# https://cloudbees.zendesk.com/hc/en-us/articles/219530988-How-to-upgrade-RPM-to-CloudBees-Jenkins-Enterprise
sudo rpm --import http://nectar-downloads.cloudbees.com/nectar/rpm/cloudbees.com.key
sudo wget -O /etc/yum.repos.d/jenkins.repo http://nectar-downloads.cloudbees.com/nectar/rpm/jenkins.repo
sudo yum clean all && sudo yum update
or 
yum clean all && sudo yum update jenkins