Exception when running project

Question

I have a project Maven where I tried to add a more recent dependency on JSF After these attempts the project always presented errors. I created a new project and copied all classes, pages etc. Now every time I run this project the following exception is thrown:

java.lang.ClassNotFoundException: javax.faces.webapp.FacesServlet

The Project is working normally, but I don’t know if this error can influence something now or in the future so I would like to solve it.

Dependency I’m using on JSF:

<!-- Implementação do JSF 2.2 -->
<dependency>
   <groupId>org.glassfish</groupId>
   <artifactId>javax.faces</artifactId>
   <version>2.2.8</version>
   <scope>compile</scope>
</dependency>

Web.xml(For the project to work I had to change the version from 2.5 to 3.0):

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
  <display-name>SistemaSuspensao</display-name>
  <welcome-file-list>
        <welcome-file>Login.xhtml</welcome-file>
    </welcome-file-list>
  <servlet>
    <servlet-name>Faces Servlet</servlet-name>
    <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>
 <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.xhtml</url-pattern>
    </servlet-mapping>
     <context-param>
    <description>Quando for atualizar o sistema no datacenter, colocar em Production, e aqui na HR colocar em Development</description>
    <param-name>javax.faces.PROJECT_STAGE</param-name>
    <param-value>Development</param-value>
  </context-param>
  <context-param>
    <param-name>primefaces.THEME</param-name>
    <param-value>hot-sneaks</param-value>
  </context-param>
  <error-page>
    <exception-type>javax.faces.application.ViewExpiredException</exception-type>
    <location>/Login.xhtml</location>
  </error-page>
  <session-config>
    <session-timeout>-1</session-timeout>
  </session-config>

</web-app>