How to update JSF library in JBoss

1. Download the expected version of JSF library.
jsf-api
https://repository.jboss.org/nexus/content/groups/public/org/jboss/spec/javax/faces/jboss-jsf-api_2.1_spec/

jsf-impl
https://repository.jboss.org/nexus/content/groups/public-jboss/com/sun/faces/jsf-impl/

2. Copy the newly downloaded JSF jar into the following folder
jsf-api
<JBoss_AS>/modules/javax/faces/api/main
<JBoss_EAP>/modules/system/layers/base/javax/faces/api/main

jsf-impl
<JBoss_AS>/modules/com/sun/jsf-impl/main
<JBoss_EAP>/modules/system/layers/base/com/sun/jsf-impl/main

3. Modify module.xml with the new jar file name.
jsf-api
    <resources>
        <resource-root path="jboss-jsf-api_2.1_spec-2.1.19.1.Final-redhat-1.jar"/>
    </resources>
jsf-impl
    <resources>
        <resource-root path="jsf-impl-2.1.19-redhat-2.jar"/>
    </resources>

4. Restart JBoss


Done!!