Selected the second PHP version, but on the command line it's still the first

I have installed 2 PHP version in my DirectAdmin environment: php5.5 (php1_release) and php7.1 (php2_release). Now I have one user set to php 7.1 with the PHP Versions Selector under Domain Setup. On the website in the browser it seems to work well, phpinfo tells me that php7.1 is running for this domain. But when I use composer from the command line it gives an error because it detects php5.5:

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Any ideas how to solve this?

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