# 6.4

### Migration guide

Version 6.4 is compatible with 6.3.

{% hint style="warning" %}
Some default [configuration](/changelog/version-6/6/6.4/6.4.0.md#infrastructure-updates) values were changed (lowered to 2MB):

LIMIT\_MESSAGE\_MAX\_BYTES=2097152

BROKER\_SERVER\_MAX\_MESSAGE\_SIZE\_BYTES=2097152

These affect the maximum size of a message that can be sent from a component. Larger messages will be rejected and stored in the *unprocessedMessages* collection (as before).
{% endhint %}

{% hint style="info" %}
The upgrade will create a new *Admin* user group, and all existing admin users will be added to it. When a new [**Admin user group**](/changelog/version-6/6/6.4/6.4.0.md#user-groups--workspaces)

This upgrade introduces a new **Admin** user group. All existing admin users are automatically added to it.

When an admin logs in, the **Admin** group is preselected in the Workspace switcher. Because this group starts empty, Appmixer will appear to have no flows or other content on first load. To access your existing work, switch to **My workspace** from the Workspace switcher.
{% endhint %}

{% content-ref url="/pages/GejeAm54SsaUtItWrQPH" %}
[6.4.3](/changelog/version-6/6/6.4/6.4.3.md)
{% endcontent-ref %}

{% content-ref url="/pages/89gg2hmFdnWKdqdqoFeN" %}
[6.4.2](/changelog/version-6/6/6.4/6.4.2.md)
{% endcontent-ref %}

{% content-ref url="/pages/UQGTL5CQNyV59B8RNldo" %}
[6.4.1](/changelog/version-6/6/6.4/6.4.1.md)
{% endcontent-ref %}

{% content-ref url="/pages/0xTiuGMbZchoFArPuNut" %}
[6.4.0](/changelog/version-6/6/6.4/6.4.0.md)
{% endcontent-ref %}


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