another fatal error (update from 5.5.0 to 5.5.2.1)

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Hi Community,
I saw other posts which described nearly the same problems but I tried to update another version of concrete 5.
first try was 5.4.whatever to 5.5.2.1, it was a No Go, so i build up a new database with a newer version of concrete 5 (5.5.0) - I couldn't use directly the newest - and tried the update to 5.5.2.1
I got this error while installing.

Fatal error: Out of memory (allocated 23068672) (tried to allocate 13888218 bytes) in /homepages/22/d107351923/htdocs/c5_1/concrete/helpers/file.php on line 185

anybody an idea what I can do now?
I'm new with concrete 5 and can't transfer the help for other versions to my one.

Greez and thanks for helping, Spiky