On Manage Jenkins page, I see the following warning message:

Warnings have been published for the following currently installed components.

Environment Injector Plugin 2.1.6

Exposure of sensitive build variables stored by EnvInject 1.90 and earlier

however my environment injector plugin is already 2.1.6.

Also in Jenkins log, there is a warning:

WARNING: Attempt to (de-)serialize anonymous class hudson.FilePath$27 in file:/var/cache/jenkins/war/WEB-INF/lib/jenkins-core-2.121.2.jar; see: https://jenkins.io/redirect/serialization-of-anonymous-classes/

Anyway to get rid of this?