Sorry about this issue, we quickly patched this shortly after the version was released.
Re-downloading the plugin will fix the problem.
The easiest way to do this is edit the main acf.php file and change the 2 references of ‘5.5.13’ down to ‘5.5.12’.
This will allow the plugin update to appear.
Let me know if this solves the issue. If not, please post back.
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