How to update 2.4 to 2.5?

Because i have problem and error with openhab2 2.4
i think to try the update to 2.5

apt install openhab2=2.5.0

but this is not working so there must be some more information to add to this

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It’s all in the docs:

You need to switch your repo to snapshots:

Snapshot Release

The snapshot build is created almost daily, and include the latest changes to the openHAB 2 core and add-ons. These changes are often unstable, so you should use this branch only for testing or development purposes.

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ok so more save would be the

Testing Release
Snapshot Release

In the testing repo you will find the milestone releases.