Error while updating or dry run.

Hello all,

I have an error while updating or do a dry run on the Composer Package management.

The server error logs show me :

Code:

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[Wed Feb 24 11:00:57 2016] [error] [client **.**.**.**] [host www.website.org] Error receiving response header (lsphp is killed?): ReceiveResponseHeader: receive pkg hdr failed: ReceiveLSHeader: nothing to read from backend socket, referer: https://www.website.org/mijn/contao/main.php?do=composer

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I already removed all the cache, that did not help.

I am on composer-client 0.16.2 and know there is an update to 0.16.3.
Is there a way that I can manual update without SSH?

Many thanks