i have used those three commands that flarum author gave but it didnt upgrade my flarum !
it just updated symphony like that
here's my composer.json

    KimYunz Sounds like a potential Composer cache issue. Try running composer clear-cache and then going through the upgrade process again.

      clarkwinkelmann
      Flarum core 0.1.0-beta.10
      PHP version: 7.1.23
      Loaded extensions: Core, date, libxml, openssl, pcre, zlib, filter, hash, pcntl, readline, Reflection, SPL, session, standard, bcmath, bz2, calendar, ctype, curl, dom, exif, fileinfo, ftp, gettext, gmp, iconv, imap, json, mcrypt, mysqlnd, PDO, Phar, posix, shmop, SimpleXML, soap, sockets, sqlite3, sysvmsg, sysvsem, sysvshm, tokenizer, xml, xmlwriter, xsl, zip, mysqli, pdo_mysql, pdo_sqlite, wddx, xmlreader, ssh2, ionCube Loader
      +---------------------------------+-------------------+--------+
      | Flarum Extensions | | |
      +---------------------------------+-------------------+--------+
      | ID | Version | Commit |
      +---------------------------------+-------------------+--------+
      | flarum-approval | v0.1.0-beta.8 | |
      | flarum-emoji | v0.1.0-beta.10 | |
      | flarum-lang-english | v0.1.0-beta.11 | |
      | flagrow-fonts | 0.2.0 | |
      | fof-formatting | 0.1.2 | |
      | flagrow-impersonate | 0.2.0 | |
      | fof-ban-ips | 0.1.5 | |
      | fof-follow-tags | 0.3.4 | |
      | fof-merge-discussions | 0.3.3 | |
      | fof-secure-https | v0.1.0 | |
      | fof-geoip | 0.1.5 | |
      | flagrow-sitemap | 0.2.0 | |
      | fof-links | 0.2.1 | |
      | fof-polls | 0.1.1 | |
      | fof-profile-image-crop | 0.1.1 | |
      | michaelbelgium-discussion-views | v0.1.0-beta.8.2 | |
      | fof-disposable-emails | 0.1.0 | |
      | fof-default-user-preferences | 0.2.0 | |
      | flarum-flags | v0.1.0-beta.10 | |
      | fof-best-answer | 0.1.3 | |
      | flagrow-direct-links | 0.2.0 | |
      | flarum-bbcode | v0.1.0-beta.8 | |
      | fof-spamblock | 0.2.1 | |
      | fof-split | 0.4.3 | |
      | fof-subscribed | 0.2.3 | |
      | fof-user-bio | 0.1.3 | |
      | fof-user-directory | 0.3.3 | |
      | fof-username-request | 0.2.0 | |
      | fof-recaptcha | 0.1.1 | |
      | saleksin-auth-google | v0.1.0-beta.8.0.3 | |
      | flarum-likes | v0.1.0-beta.9 | |
      | flarum-lock | v0.1.0-beta.9 | |
      | irony-login2see | 0.0.1 | |
      | kilowhat-mailing | 0.1.2 | |
      | flarum-markdown | v0.1.0-beta.10 | |
      | flarum-mentions | v0.1.0-beta.10 | |
      | antoinefr-online | 0.4.0 | |
      | v17development-seo | 1.0.2 | |
      | flarum-statistics | v0.1.0-beta.9 | |
      | flarum-sticky | v0.1.0-beta.9 | |
      | flarum-subscriptions | v0.1.0-beta.9 | |
      | flarum-suspend | v0.1.0-beta.10 | |
      | flarum-tags | v0.1.0-beta.11 | |
      | flarum-auth-facebook | v0.1.0-beta.9 | |
      +---------------------------------+-------------------+--------+
      Base URL: xxxxxxxxxxxxxxxxxxx
      Installation path: xxxxxxxxxxxxxxxxxxx
      Debug mode: off

        3 months later

        I have the same issue. Did you resolve it?
        Thanks

          Th0mC run

          composer why-not flarum/core v0.1.0-beta.12

          Every 3rd party extension mentioned (so none that start with flarum/) should be removed.

            Sorry but will this uninstall all my third party extension? Or do you mean that I need to desactivate all third party extension before to run this (as for the normal upgrade process)?

            2 months later

            Hi all,
            I retry to upgrade and I still have the same issue.
            So I tried composer clear-cache suggested by @tankerkiller125 but know I have another issue:
            each time I try to update or to remove an extension, I have the following error message

            [Composer\Downloader\TransportException]
            The "https://flagrow.io/satis/packages.json" file could not be downloaded (HTTP/1.1 500 Internal Server Error)

            @luceos , result of
            composer why-not flarum/core v0.1.0-beta.12 is

            kilowhat/flarum-ext-mailing 0.1.2 requires flarum/core (>=0.1.0-beta.8 <0.1.0-beta.11)
            flarum/core v0.1.0-beta.12 requires s9e/text-formatter (^ 2.3.6)
            flarum/flarum - does not require s9e/text-formatter (but 1.4.5 is installed)