ClassNotFoundException: javax.faces.webapp.FacesServlet | Java: Laboratório com Testes, JSF e Design Patterns II

Segui todo o passo a passo da video aula e me deparei com esse erro no momento que executei o servidor:

GRAVE: Servlet [Faces Servlet] in web application [/Argentum] threw load() exception
java.lang.ClassNotFoundException: javax.faces.webapp.FacesServlet
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1358)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1180)
    at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:546)
    at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:527)
    at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:150)
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1044)
    at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:985)
    at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4885)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5199)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1412)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1402)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

<dependencies> <dependency> <groupId>com.thoughtworks.xstream</groupId> <artifactId>xstream</artifactId> <version>1.4.9</version> </dependency>  <dependency> <groupId>com.sun.faces</groupId> <artifactId>jsf-api</artifactId> <version>2.2.13</version> </dependency> <dependency> <groupId>com.sun.faces</groupId> <artifactId>jsf-impl</artifactId> <version>2.2.13</version> </dependency> <dependency> <groupId>org.primefaces</groupId> <artifactId>primefaces</artifactId> <version>6.0</version> </dependency> </dependencies>