Maven: how to update all dependendies

$ mvn versions:display-dependency-updates
...
[INFO] The following dependencies in Dependencies have newer versions:
[INFO]   commons-io:commons-io ..................................... 1.4 -> 2.1
[INFO]   commons-lang:commons-lang ................................. 2.5 -> 2.6
[INFO]   javax.mail:mail ................................... 1.4.3 -> 1.4.5-rc1
...

References

plugin versions:display-dependency-updates