diff --git a/.github/actions/upload-test-coverage/action.yml b/.github/actions/upload-test-coverage/action.yml
new file mode 100644
index 0000000..3b41696
--- /dev/null
+++ b/.github/actions/upload-test-coverage/action.yml
@@ -0,0 +1,21 @@
+name: "Upload test coverage file"
+description: "Upload test coverage file to the desired location"
+outputs:
+  coverage-value:
+    description: "coverage value"
+    value: ${{ steps.coverage-value-getter.outputs.coverage-value }}
+runs:
+  using: "composite"
+  steps:
+    - name: "Archive code coverage results"
+      uses: actions/upload-artifact@v3
+      with:
+        name: code-coverage-report
+        path: coverage
+
+    - name: "Get coverage value"
+      id: coverage-value-getter
+      run: |
+        coverage_value=`cat ./coverage/.last_run.json | jq -r .result.line`
+        echo "coverage-value=$coverage_value" >> "$GITHUB_OUTPUT"
+      shell: bash
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3e6abda..668c378 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,7 +13,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu, macos]
-        ruby: [2.6, 2.7]
+        ruby: [2.7]
     runs-on: ${{ matrix.os }}-latest
     steps:
       - uses: actions/checkout@v2
@@ -30,12 +30,13 @@ jobs:
         run:  bundle exec rubocop
       - name: Run RSpec
         run: bundle exec rspec
-      # https://docs.github.com/ja/actions/configuring-and-managing-workflows/persisting-workflow-data-using-artifacts
-      - name: Archive code coverage results
-        uses: actions/upload-artifact@v2
-        with:
-          name: code-coverage-report
-          path: coverage
+      - name: Upload test coverage
+        id: upload-test-coverage
+        uses: ./.github/actions/upload-test-coverage
+      - name: Display test coverage in summary
+        run: |
+          coverage_value=${{ steps.upload-test-coverage.outputs.coverage-value }}
+          echo "# Coverage report: $coverage_value%" >> $GITHUB_STEP_SUMMARY
       # https://github.com/marketplace/actions/action-slack
       - name: Github Actions notify to Slack
         uses: 8398a7/action-slack@v3
diff --git a/.tool-versions b/.tool-versions
new file mode 100644
index 0000000..a4023dc
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1 @@
+ruby 2.7.5
diff --git a/Gemfile.lock b/Gemfile.lock
index 6e9de2a..801e800 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -7,7 +7,7 @@ GEM
     awesome_print (1.9.2)
     byebug (11.1.3)
     coderay (1.1.3)
-    connection_pool (2.3.0)
+    connection_pool (2.4.0)
     diff-lcs (1.5.0)
     docile (1.4.0)
     domain_name (0.5.20190701)
@@ -29,12 +29,12 @@ GEM
     method_source (0.9.2)
     mime-types (3.4.1)
       mime-types-data (~> 3.2015)
-    mime-types-data (3.2022.0105)
-    mini_portile2 (2.8.0)
+    mime-types-data (3.2023.0218.1)
+    mini_portile2 (2.8.1)
     net-http-digest_auth (1.4.1)
     net-http-persistent (4.0.1)
       connection_pool (~> 2.2)
-    nokogiri (1.13.8)
+    nokogiri (1.14.2)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     parallel (1.22.1)
@@ -49,11 +49,11 @@ GEM
     pry-doc (1.3.0)
       pry (~> 0.11)
       yard (~> 0.9.11)
-    public_suffix (5.0.0)
-    qiita_trend (0.5.2)
+    public_suffix (5.0.1)
+    qiita_trend (0.5.4)
       mechanize (~> 2.7)
       nokogiri (~> 1.11)
-    racc (1.6.0)
+    racc (1.6.2)
     rainbow (3.1.1)
     regexp_parser (2.6.0)
     rexml (3.2.5)