diff --git a/.github/workflows/lint.yaml b/.github/workflows/lint.yaml
new file mode 100644
index 00000000..b61b6cbb
--- /dev/null
+++ b/.github/workflows/lint.yaml
@@ -0,0 +1,44 @@
+name: Lint
+
+on:
+  pull_request:
+    branches:
+      - master
+      - migrate_to_gha # for debug
+    paths:
+      - '**/*.rb'
+
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 3.2  # 必要な Ruby バージョン
+      - name: Restore Gem cache
+        uses: actions/cache@v4
+        with:
+          path: vendor/bundle
+          key: lint-${{ hashFiles('Gemfile.lock') }}
+      - name: Install dependencies
+        run: |
+          bundle config set --local path 'vendor/bundle'
+          bundle config set --local with 'development'
+          bundle install
+      - name: Set up upstream
+        run: |
+          git remote add upstream https://github.com/${{ github.event.pull_request.base.repo.full_name }}.git
+          git remote -v
+          git fetch upstream
+          git fetch --all
+          git branch -r
+
+      - name: Run RuboCop
+        run: |
+          git merge-base upstream/${{ github.base_ref }} HEAD
+          git diff --name-only upstream/${{ github.base_ref }}...HEAD -- '*.rb' | xargs -r bundle exec rubocop -f html --out report.html
+
+      - name: Upload RuboCop report
+        uses: actions/upload-artifact@v4
diff --git a/.github/workflows/system_test.yaml b/.github/workflows/system_test.yaml
new file mode 100644
index 00000000..f49976d1
--- /dev/null
+++ b/.github/workflows/system_test.yaml
@@ -0,0 +1,57 @@
+name: System test
+
+on:
+  push:
+    branches:
+      - master
+      - migrate_to_gha
+  pull_request:
+    branches:
+      - master
+      - migrate_to_gha
+
+jobs:
+  generate_cache:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Restore Docker cache
+        uses: actions/cache@v4
+        with:
+          path: ~/caches/images.tar
+          key: docker-${{ hashFiles('.github/workflows/ci.yml', 'docker-compose.system-test.yml', 'Dockerfile.system-test', 'bucky-core.gemspec', '.dockerignore') }}
+      - name: Build and cache Docker images
+        run: |
+          if [ ! -f ~/caches/images.tar ]; then
+            docker-compose -f docker-compose.system-test.yml build
+            mkdir -p ~/caches
+            docker save $(docker images | awk 'NR>=2 && ! /^<none>/{print $1}') -o ~/caches/images.tar
+          fi
+
+  run:
+    runs-on: ubuntu-latest
+    needs: generate_cache_for_system_test
+    strategy:
+      matrix:
+        shard: [1, 2]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Restore Docker cache
+        uses: actions/cache@v4
+        with:
+          path: ~/caches/images.tar
+          key: docker-${{ hashFiles('.github/workflows/ci.yml', 'docker-compose.system-test.yml', 'Dockerfile.system-test', 'bucky-core.gemspec', '.dockerignore') }}
+      - name: Load Docker images
+        run: docker load -q -i ~/caches/images.tar
+      - name: Start Docker services
+        run: docker-compose -f docker-compose.system-test.yml up -d
+      - name: Run system tests
+        run: |
+          find system_testing/testing_code -name "*.bats" | xargs -n 1 -I {} docker exec bucky-core bats "/bucky-core/"{} | tee test-results-${{ matrix.shard }}.log
+      - name: Stop Docker services
+        run: docker-compose -f docker-compose.system-test.yml down
+      - name: Upload test logs
+        uses: actions/upload-artifact@v4
+        with:
+          name: system-test-logs
+          path: test-results-*.log
\ No newline at end of file
diff --git a/.github/workflows/unit_test.yaml b/.github/workflows/unit_test.yaml
new file mode 100644
index 00000000..034320de
--- /dev/null
+++ b/.github/workflows/unit_test.yaml
@@ -0,0 +1,55 @@
+name: Unit test
+
+on:
+  push:
+    branches:
+      - master
+      - migrate_to_gha
+  pull_request:
+    branches:
+      - master
+      - migrate_to_gha
+
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 3.2  # 必要な Ruby バージョン
+      - name: Restore Gem cache
+        uses: actions/cache@v4
+        with:
+          path: vendor/bundle
+          key: unit-test-${{ hashFiles('Gemfile.lock') }}
+      - name: Install dependencies
+        run: |
+          bundle config set --local path 'vendor/bundle'
+          bundle config set --local with 'development'
+          bundle install
+      - name: Add bundle bin to PATH
+        run: echo "$(pwd)/vendor/bundle/bin" >> $GITHUB_PATH
+      - name: Run tests
+        run: |
+          bundle exec rspec --format html -o rspec-report.html
+      - name: Upload RSpec HTML report
+        uses: actions/upload-artifact@v4
+        with:
+          name: rspec-html-report
+          path: rspec-report.html
+      - name: Check coverage threshold
+        env:
+          COVERAGE_THRESHOLD: 90
+        run: |
+          COVERAGE=$(jq '.result.covered_percent' coverage/.last_run.json)
+          if [[ -z "$COVERAGE" || ! "$COVERAGE" =~ ^[0-9]+(\.[0-9]+)?$ ]]; then
+            echo "Failed to extract coverage percentage."
+            exit 1
+          fi
+          echo "Coverage: $COVERAGE%"
+          if (( $(echo "$COVERAGE < $COVERAGE_THRESHOLD" | bc -l) )); then
+            echo "Test coverage ($COVERAGE%) is below the threshold ($COVERAGE_THRESHOLD%)"
+            exit 1
+          fi
\ No newline at end of file