Cannot update maven on Ubuntu 20.04

I'm not able to update maven to the latest version, which as of time of writing is 3.8.6:

$ mvn --version
Apache Maven 3.6.3
Maven home: /usr/share/maven
Java version: 17.0.5, vendor: Private Build, runtime: /usr/lib/jvm/java-17-openjdk-amd64
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "5.15.0-53-generic", arch: "amd64", family: "unix" 
$ sudo apt-get update
Hit:1 https://repo.saltproject.io/py3/ubuntu/20.04/amd64/archive/3004.1 focal InRelease
Get:2 https://download.docker.com/linux/ubuntu focal InRelease [57.7 kB]                                                                    
Hit:3 http://ppa.launchpad.net/linuxuprising/shutter/ubuntu focal InRelease                                                                 
Hit:4 http://de.archive.ubuntu.com/ubuntu focal-backports InRelease                                                                         
Hit:5 http://dl.google.com/linux/chrome/deb stable InRelease                                                                                
Hit:6 http://de.archive.ubuntu.com/ubuntu focal-security InRelease                                                                          
Hit:7 http://ppa.launchpad.net/blaze/rtbth-dkms/ubuntu focal InRelease                                                                      
Hit:8 http://de.archive.ubuntu.com/ubuntu focal InRelease                                                                                   
Hit:9 http://de.archive.ubuntu.com/ubuntu focal-updates InRelease                                                                           
Hit:10 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu focal InRelease                                                                       
Hit:13 https://ftp.postgresql.org/pub/pgadmin/pgadmin4/apt/focal pgadmin4 InRelease                                               
Hit:11 https://scala.jfrog.io/artifactory/debian all InRelease        
Ign:12 https://scala.jfrog.io/artifactory/debian  InRelease
Hit:14 https://scala.jfrog.io/artifactory/debian  Release
Fetched 57.7 kB in 2s (25.6 kB/s)
Reading package lists... Done
$ sudo apt-get --only-upgrade install maven
Reading package lists... Done
Building dependency tree       
Reading state information... Done
maven is already the newest version (3.6.3-1).
0 upgraded, 0 newly installed, 0 to remove and 7 not upgraded.

It doesn't seem to find newer versions. Any idea?

You need to install the newest version by yourself.

This may help you to do that.

The apt package isn't updated yet. You either have to wait for this to be updated, or try and find the package from maven themself.