I am trying to update Magento 2.2.7 to 2.3.0:
composer require magento/product-community-edition:2.3.0 --no-update
composer update
However a strange error is trown:
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.
Problem 1
- magento/module-theme 100.1.12 requires php ~5.6.5|7.0.2|7.0.4|~7.0.6 -> your PHP version (7.1.16) does not satisfy that requirement.
- magento/module-theme 100.1.11 requires php ~5.6.5|7.0.2|7.0.4|~7.0.6 -> your PHP version (7.1.16) does not satisfy that requirement.
- magento/module-theme 100.1.10 requires php ~5.6.5|7.0.2|7.0.4|~7.0.6 -> your PHP version (7.1.16) does not satisfy that requirement.
- magento/module-theme 100.1.9 requires php ~5.6.5|7.0.2|7.0.4|~7.0.6 -> your PHP version (7.1.16) does not satisfy that requirement.
- magento/module-theme 100.1.8 requires php ~5.6.5|7.0.2|7.0.4|~7.0.6 -> your PHP version (7.1.16) does not satisfy that requirement.
- magento/module-theme 100.1.7 requires php ~5.6.5|7.0.2|7.0.4|~7.0.6 -> your PHP version (7.1.16) does not satisfy that requirement.
- magento/module-theme 100.1.6 requires php ~5.6.5|7.0.2|7.0.4|~7.0.6 -> your PHP version (7.1.16) does not satisfy that requirement.
- magento/module-theme 100.1.5 requires php ~5.6.5|7.0.2|7.0.4|~7.0.6 -> your PHP version (7.1.16) does not satisfy that requirement.
- magento/module-theme 100.1.4 requires php ~5.6.5|7.0.2|7.0.4|~7.0.6 -> your PHP version (7.1.16) does not satisfy that requirement.
- magento/module-theme 100.1.3 requires php ~5.6.5|7.0.2|7.0.4|~7.0.6 -> your PHP version (7.1.16) does not satisfy that requirement.
- magento/module-theme 100.1.2 requires php ~5.6.5|7.0.2|7.0.4|~7.0.6 -> your PHP version (7.1.16) does not satisfy that requirement.
- magento/module-theme 100.1.1 requires php ~5.6.0|7.0.2|~7.0.6 -> your PHP version (7.1.16) does not satisfy that requirement.
- magento/module-theme 100.1.0 requires php ~5.6.0|7.0.2|~7.0.6 -> your PHP version (7.1.16) does not satisfy that requirement.
- magento/module-theme 100.1.0-rc3 requires php ~5.6.0|7.0.2|~7.0.6 -> your PHP version (7.1.16) does not satisfy that requirement.
- magento/module-theme 100.1.0-rc2 requires php ~5.5.22|~5.6.0|~7.0.0 -> your PHP version (7.1.16) does not satisfy that requirement.
- magento/module-theme 100.1.0-rc1 requires php ~5.5.22|~5.6.0|~7.0.0 -> your PHP version (7.1.16) does not satisfy that requirement.
- magento/module-theme 100.0.10 requires php ~5.5.0|~5.6.0|~7.0.0 -> your PHP version (7.1.16) does not satisfy that requirement.
- magento/module-theme 100.0.9 requires php ~5.5.0|~5.6.0|~7.0.0 -> your PHP version (7.1.16) does not satisfy that requirement.
- magento/module-theme 100.0.8 requires php ~5.5.0|~5.6.0|~7.0.0 -> your PHP version (7.1.16) does not satisfy that requirement.
- magento/module-theme 100.0.7 requires php ~5.5.0|~5.6.0|~7.0.0 -> your PHP version (7.1.16) does not satisfy that requirement.
- magento/module-theme 100.0.6 requires php ~5.5.0|~5.6.0|~7.0.0 -> your PHP version (7.1.16) does not satisfy that requirement.
- magento/module-theme 100.0.5 requires php ~5.5.0|~5.6.0|~7.0.0 -> your PHP version (7.1.16) does not satisfy that requirement.
- magento/module-theme 100.0.4 requires php ~5.5.0|~5.6.0|~7.0.0 -> your PHP version (7.1.16) does not satisfy that requirement.
- magento/module-theme 100.0.3 requires php ~5.5.0|~5.6.0|~7.0.0 -> your PHP version (7.1.16) does not satisfy that requirement.
- magento/module-theme 100.0.2 requires php ~5.5.0|~5.6.0|~7.0.0 -> your PHP version (7.1.16) does not satisfy that requirement.
- weltpixel/module-google-tag-manager 1.6.4 requires magento/module-theme 100.* -> satisfiable by magento/module-theme[100.2.5, 100.0.2, 100.0.3, 100.0.4, 100.0.5, 100.1.0-rc1, 100.1.0-rc2, 100.1.0-rc3, 100.1.0, 100.0.6, 100.1.1, 100.1.2, 100.1.3, 100.0.7, 100.1.4, 100.0.8, 100.1.5, 100.1.6, 100.2.0-rc20, 100.2.0-rc21, 100.2.0-rc22, 100.2.0-rc23, 100.2.0-rc30, 100.1.7, 100.0.9, 100.2.0, 100.0.10, 100.2.1, 100.1.8, 100.1.9, 100.2.2, 100.2.3, 100.1.10, 100.2.4, 100.1.11, 100.1.12, 100.2.6, 100.1.13, 100.2.7].
- weltpixel/module-google-tag-manager 1.6.4 requires magento/module-theme 100.* -> satisfiable by magento/module-theme[100.2.5, 100.0.2, 100.0.3, 100.0.4, 100.0.5, 100.1.0-rc1, 100.1.0-rc2, 100.1.0-rc3, 100.1.0, 100.0.6, 100.1.1, 100.1.2, 100.1.3, 100.0.7, 100.1.4, 100.0.8, 100.1.5, 100.1.6, 100.2.0-rc20, 100.2.0-rc21, 100.2.0-rc22, 100.2.0-rc23, 100.2.0-rc30, 100.1.7, 100.0.9, 100.2.0, 100.0.10, 100.2.1, 100.1.8, 100.1.9, 100.2.2, 100.2.3, 100.1.10, 100.2.4, 100.1.11, 100.1.12, 100.2.6, 100.1.13, 100.2.7].
- Can only install one of: magento/module-theme[101.0.0, 100.1.13].
- Can only install one of: magento/module-theme[101.0.0, 100.2.5].
- Can only install one of: magento/module-theme[101.0.0, 100.2.0-rc20].
- Can only install one of: magento/module-theme[101.0.0, 100.2.0-rc21].
- Can only install one of: magento/module-theme[101.0.0, 100.2.0-rc22].
- Can only install one of: magento/module-theme[101.0.0, 100.2.0-rc23].
- Can only install one of: magento/module-theme[101.0.0, 100.2.0-rc30].
- Can only install one of: magento/module-theme[101.0.0, 100.2.0].
- Can only install one of: magento/module-theme[101.0.0, 100.2.1].
- Can only install one of: magento/module-theme[101.0.0, 100.2.2].
- Can only install one of: magento/module-theme[101.0.0, 100.2.3].
- Can only install one of: magento/module-theme[101.0.0, 100.2.4].
- Can only install one of: magento/module-theme[101.0.0, 100.2.5].
- Can only install one of: magento/module-theme[101.0.0, 100.2.6].
- Can only install one of: magento/module-theme[101.0.0, 100.2.7].
- magento/product-community-edition 2.3.0 requires magento/module-theme 101.0.0 -> satisfiable by magento/module-theme[101.0.0].
- Installation request for magento/product-community-edition 2.3.0 -> satisfiable by magento/product-community-edition[2.3.0].
- Installation request for weltpixel/module-google-tag-manager ^1.6 -> satisfiable by weltpixel/module-google-tag-manager[1.6.4].
It seems the installer tries to install old packages. We are using PHP 7.1. Can anybody help out?