When I do bundle update I get:

Bundler could not find compatible versions for gem "ruby":
In Gemfile:
ruby (~> 3.0.0)

thredded (~> 0.16.13) was resolved to 0.16.16, which depends on
  ruby (~> 2.3)

I looked online and someone said to do bundle update rails but when I do I get this error:

Bundler could not find compatible versions for gem "activemodel":
In Gemfile:
active_model_serializers was resolved to 0.10.10, which depends on
activemodel (>= 4.1, < 6.1)

challonge-api was resolved to 0.2.0, which depends on
  activeresource was resolved to 5.1.0, which depends on

activemodel-serializers-xml (~> 1.0) was resolved to 1.0.2, which
depends on
activemodel (> 5.x)

challonge-api was resolved to 0.2.0, which depends on
  activeresource was resolved to 5.1.0, which depends on
    activemodel (>= 5.0, < 7)

carrierwave was resolved to 2.0.2, which depends on
  activemodel (>= 5.0.0)

rails (= 6.1.2.1) was resolved to 6.1.2.1, which depends on
  activemodel (= 6.1.2.1)

Any ideas what I need to do?

Here is my gem file:

source 'https://rubygems.org'
ruby '~> 3.0.0'

Bundle edge Rails instead: gem 'rails', github: 'rails/rails'

gem 'rails', '6.1.2.1'

Use SCSS for stylesheets

gem 'sass-rails', '~> 5.0.0'

Use Uglifier as compressor for JavaScript assets

gem 'uglifier', '>= 1.3.0'

Use jquery as the JavaScript library

gem 'jquery-rails'
gem 'merit', '= 3.0.1'

Used to implement at.js for auto complete mentions/emojis

gem 'jquery-atwho-rails'

Use twitter bootstrap sass

gem 'bootstrap-sass', '~> 3.4.0'
gem 'autoprefixer-rails'

gem 'font-awesome-rails'

gem 'font-awesome5-rails', '~> 1.0', '>= 1.0.1'

gem 'font_awesome5_rails'

gem 'xbox_live_api'
gem 'faraday'
gem 'oj'

gem 'thredded', '~> 0.16.13'
gem 'rails-ujs'

group :development do
gem 'spring'
gem 'letter_opener'
gem 'guard'
gem 'guard-rspec', '~> 4.2.8'
gem 'byebug'
end

group :development, :test do
gem 'puma'
gem 'sqlite3', '~> 1.3.6'
end

group :production do
gem 'pg', '~>0.18'
gem 'unicorn'
gem 'cloudinary'
gem 'rails_12factor'
gem 'fog'
gem 'fog-aws'
end

gem 'devise'
gem 'carrierwave'
gem 'friendly_id', '~> 5.0'

gem 'will_paginate', '~> 3.1.0'
gem 'public_activity'

gem 'acts_as_votable', '~> 0.10.0'
gem 'acts_as_commentable'
gem 'acts_as_follower'
gem 'counter_culture', '~> 0.1.33'

gem 'faker'
gem 'populator'
gem 'auto_html', '~>1.6.4'
gem 'sanitize'

gem 'active_model_serializers'

gem 'private_pub'
gem 'thin'

Use ActiveModel has_secure_password

gem 'bcrypt', '~> 3.1.7'

Use unicorn as the app server

gem 'unicorn'

Use Capistrano for deployment

gem 'capistrano-rails', group: :development

Use debugger

gem 'debugger', group: [:development, :test]

gem 'round_robin_tournament'
gem 'tournament-system', '~> 2'
gem 'challonge-api'
gem 'tournament'

gem 'oauth2'
gem 'activerecord-session_store'

gem "simple_calendar", "~> 2.0"