diff --git a/.github/workflows/test_rails_70.yml b/.github/workflows/test_rails_70.yml
new file mode 100644
index 00000000000..dbadb674a3f
--- /dev/null
+++ b/.github/workflows/test_rails_70.yml
@@ -0,0 +1,62 @@
+name: Test Rails 7
+
+on:
+  push:
+    branches: rails7
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+
+    env:
+      RAILS_ENV: test
+      DATABASE_URL: "postgres://postgres:postgres@localhost/ci_test"
+      TZ: 'Asia/Tokyo'
+      BUNDLE_GEMFILE: 'gemfiles/rails_70.gemfile'
+      BUNDLE_DEPLOYMENT: "false"
+      DISABLE_SPRING: "1"
+
+    services:
+      postgres:
+        image: postgres
+        ports:
+          - 5432:5432
+        env:
+          POSTGRES_PASSWORD: postgres
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Copy Gemfile.lock to gemfiles directory
+      run: cp Gemfile.lock ${{ env.BUNDLE_GEMFILE }}.lock
+
+    - uses: sinsoku/setup-ruby@respect_bundle_deployment
+      with:
+        bundler-cache: true
+
+    - name: Cache node modules
+      uses: actions/cache@v2.1.4
+      with:
+        path: node_modules
+        key: ${{ runner.os }}-node-${{ hashFiles('**/yarn.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-node-
+
+    - name: yarn install
+      run:  yarn install --check-files
+
+    - name: Setup test DB
+      run: bundle exec rails db:setup
+
+    - name: Run tests
+      run: bundle exec rails test:all
diff --git a/.gitignore b/.gitignore
index 6a6d40c98b9..d23d4751d2a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -45,3 +45,4 @@ storage/
 yarn-debug.log*
 .yarn-integrity
 .envrc
+gemfiles/*.lock
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index e8a142ff71c..a7239ed4a57 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -37,7 +37,11 @@ def set_available_emojis
   def set_host_for_disk_storage
     return unless %i[local test].include? Rails.application.config.active_storage.service
 
-    ActiveStorage::Current.host = request.base_url
+    if Rails::VERSION::STRING.start_with?('7.0')
+      ActiveSupport::Deprecation.silence { ActiveStorage::Current.host = request.base_url }
+    else
+      ActiveStorage::Current.host = request.base_url
+    end
   end
 
   def require_card
diff --git a/config/environments/development.rb b/config/environments/development.rb
index 286edf5474d..ed6848afaa3 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -80,9 +80,11 @@
    config.action_controller.asset_host = "http://localhost:3000"
    config.action_mailer.asset_host = "http://localhost:3000"
 
-   config.after_initialize do
-     Bullet.enable = true
-     Bullet.add_footer = true
-     Bullet.bullet_logger = true
-   end
+  unless Rails::VERSION::STRING.start_with?("7.0")
+    config.after_initialize do
+      Bullet.enable = true
+      Bullet.add_footer = true
+      Bullet.bullet_logger = true
+    end
+  end
 end
diff --git a/gemfiles/rails_70.gemfile b/gemfiles/rails_70.gemfile
new file mode 100644
index 00000000000..7b2ca21dd4e
--- /dev/null
+++ b/gemfiles/rails_70.gemfile
@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+eval_gemfile File.expand_path('../Gemfile', __dir__)
+
+# 依存関係を上書きするため、一度gemの依存を削除
+overwrite_gems = %w[rails acts-as-taggable-on meta-tags zeitwerk data_migrate ransack bullet any_login]
+dependencies.delete_if { |d| overwrite_gems.include?(d.name) }
+
+gem 'rails', github: 'rails/rails', tag: 'v7.0.1'
+
+gem 'any_login', github: 'igorkasyanchuk/any_login'
+gem 'data_migrate', '7.0.2'
+gem 'ransack', '2.5.0'
+gem 'zeitwerk', '2.5.4'
+gem 'acts-as-taggable-on', '9.0.1'
+gem 'meta-tags', '2.16.0'