Docker version not supported after the later update

Everything worked fine until today. I Upgrade the docker via the admin page, after it finished, the forum loads fine. I went to upgrade the discourse version but I then get to a page that tell me this:

<h2>You are running an old version of the Discourse image.</h2>
Upgrades via the web UI are disabled until you run the latest image.
To do so log in to your server using SSH and run:

cd /var/discourse
git pull
./launcher rebuild app

I never had this page before. I logged in to the server via SSH and try to run those commands and I get:

Error: Docker version 1.11.2 not supported, please upgrade to at least 17.03.1, or recommended 17.06.2.

What to do? Thanks.

I believe you just have to request docker to upgrade, easiest way (for me), was to run
wget -qO- | sh


Worked, thanks a lot.

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