UnexpectedValueException Could not parse version constraint ^1.0.2: Invalid version string "^1.0.2"

Question

Composer gives the following error:

Could not load package phpspec/prophecy in http://packagist.org: [UnexpectedValueException] Could not parse version constraint ^1.0.2: Invalid version string "^1.0.2"  

Answer 1

Composer added the ability to use the caret operator in early December 2014. Updating Composer will eliminate this problem - which is quite common because everyone uses PHPUnit, and PHPUnit started using this operator in late January 2015.

Answer 2

Found this post on github: https://github.com/phpspec/prophecy/commit/f802af851cc983d0ed074d29cba14af6766a24b1

Which says:

Update your composer version.

I've just checked https://github.com/composer/satis and satis is infact using a version of composer that supports this new syntax, so you must be using an old version of satis.

– GrahamCampbell added a note 19 days ago

Try updating composer (and satis if you use it)

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Additionally this has been reported here: https://github.com/composer/satis/issues/200