ruby - Bundler が互換性のあるバージョンを見つけられないのはなぜですか?

Question

私はbundle upgradeいくつかの宝石を調べていますが、奇妙なエラーが発生しています:

Bundler could not find compatible versions for gem "tzinfo":
  In Gemfile:
    rails (= 5.2.3) was resolved to 5.2.3, which depends on
      activesupport (= 5.2.3) was resolved to 5.2.3, which depends on
        tzinfo (~> 1.1)

    tzinfo-data was resolved to 1.2019.2, which depends on
      tzinfo (>= 1.0.0)

tzinfo 1.1 はこれを満たしませんか? >= 1.0.0のサブセットだけではありませんtzinfo (~> 1.1)か?

Bundler could not find compatible versions for gem "mongo":
  In Gemfile:
    mongo (~> 2.4.1)

    mongoid (~> 6.0) was resolved to 6.2.1, which depends on
      mongo (< 3.0.0, >= 2.4.1)

mongo 2.4.1 がこれらを満たさないのはなぜですか?