diff --git a/.circleci/config.yml b/.circleci/config.yml
deleted file mode 100644
index 8b126b09..00000000
--- a/.circleci/config.yml
+++ /dev/null
@@ -1,98 +0,0 @@
-version: 2
-jobs:
-  build:
-    docker:
-    - image: cimg/ruby:3.1.2
-      environment:
-      - RAILS_ENV: test
-      - SELENIUM_CHROME_HEADLESS: true
-    - image: circleci/mysql:8.0.28
-      command: mysqld --default-authentication-plugin=mysql_native_password
-      environment:
-        MYSQL_HOST: 127.0.0.1
-        MYSQL_PORT: 3306
-        MYSQL_USER: suikoden
-        MYSQL_PASSWORD: suikoden
-        MYSQL_DATABASE: suikoden_election_2018_test
-        MYSQL_ROOT_PASSWORD: suikoden
-        MYSQL_ROOT_HOST: '%'
-        MYSQL_ALLOW_EMPTY_PASSWORD: yes
-      # mbind: Operation not permitted 対策...効かない
-      cap_add:
-        - SYS_NICE
-    working_directory: ~/repo
-    steps:
-    - checkout
-    - restore_cache:
-        keys:
-        - v1-dependencies-{{ checksum "Gemfile.lock" }}-{{ checksum "yarn.lock" }}
-        - v1-dependencies-
-    - run:
-        name: Install system dependencies
-        command: |
-          sudo apt update --allow-releaseinfo-change
-          sudo apt install -y gconf-service libasound2 libatk1.0-0 libc6 libcairo2 libcups2 libdbus-1-3 libexpat1 libfontconfig1 libgcc-s1 libgconf-2-4 libgdk-pixbuf2.0-0 libglib2.0-0 libgtk-3-0 libnspr4 libpango-1.0-0 libpangocairo-1.0-0 libstdc++6 libx11-6 libx11-xcb1 libxcb1 libxcomposite1 libxcursor1 libxdamage1 libxext6 libxfixes3 libxi6 libxrandr2 libxrender1 libxss1 libxtst6 ca-certificates fonts-liberation libnss3 lsb-release xdg-utils wget lsof libvulkan1 udev libudev1 libu2f-udev libgbm1 libwayland-server0
-          sudo apt install fonts-migmix
-    - run:
-        name: libffi7 対策
-        command: |
-          sudo ln -s /usr/lib/x86_64-linux-gnu/libffi.so.7.1.0 /usr/lib/x86_64-linux-gnu/libffi.so.6
-    - run:
-        name: Install Node.js
-        # https://github.com/nodesource/distributions/blob/master/README.md#debmanual
-        command: |
-          curl -fsSL https://deb.nodesource.com/setup_current.x | sudo -E bash -
-          sudo apt install -y nodejs
-    - run:
-        name: Install Chrome
-        command: |
-          curl -L -o google-chrome.deb https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb
-          sudo dpkg -i google-chrome.deb
-          sudo sed -i 's|HERE/chrome\"|HERE/chrome\" --disable-setuid-sandbox|g' /opt/google/chrome/google-chrome
-          rm google-chrome.deb
-          /opt/google/chrome/google-chrome --version
-    - run:
-        # For Heroku
-        name: Install appropriate version's Bundler whose number is written in 'Gemfile.lock'
-        command: |
-          gem install bundler:2.2.32
-    - run:
-        # v2.1.4 for Heroku
-        name: Install gems written in Gemfile
-        command: |
-          bundle _2.2.32_ install --jobs=4 --retry=3 --path vendor/bundle
-    - run:
-        name: Install Yarn
-        command: |
-          curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
-          echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
-          sudo apt update
-          sudo apt install yarn
-    - run:
-        name: Execute "yarn install"
-        # TODO: 調整の必要あり
-        command: yarn install
-    - save_cache:
-        key: v1-dependencies-{{ checksum "Gemfile.lock" }}-{{ checksum "yarn.lock" }}
-        paths:
-          - vendor/bundle
-          - node_modules
-    - run:
-        name: Wait for booting DBMS
-        command: dockerize -wait tcp://127.0.0.1:3306 -timeout 10s
-    # TODO: 現状、1,000件 以上あるのでいったんコメントアウト
-    # - run:
-    #     # db:migrate の前に実行しておかないと Schemafile の ダブルクォート でコケる
-    #     name: Execute RuboCop
-    #     command: bundle exec rubocop
-    - run:
-        name: Setup database
-        command: bin/rails db:create; bin/rails db:migrate;
-    # 現状、rails_helper が無い
-    # - run:
-    #     name: Run Rails Test
-    #     command: |
-    #       mkdir /tmp/test-results
-    #       bundle exec rspec --format progress \
-    #                       $(circleci tests glob "spec/**/*_spec.rb" | circleci tests split --split-by=timings)
-    #     when: always # RuboCopは失敗しても通す（WARNING以上は落としてもいいかもしれない）
diff --git a/.github/workflows/config.yml b/.github/workflows/config.yml
index 351bd910..963703b0 100644
--- a/.github/workflows/config.yml
+++ b/.github/workflows/config.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ["3.1.2"]
+        ruby-version: ["3.1.3"]
     steps:
     - name: コードをチェックアウトする
       uses: actions/checkout@v3
diff --git a/.gitignore b/.gitignore
index 67a8d53f..2da12cd2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
+.envrc
+
 *.rbc
 capybara-*.html
 .rspec
diff --git a/.ruby-version b/.ruby-version
index ef538c28..ff365e06 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.1.2
+3.1.3
diff --git a/Gemfile b/Gemfile
index 7d3603ab..3ca0d6b4 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ git_source(:github) do |repo_name|
   "https://github.com/#{repo_name}.git"
 end
 
-ruby '3.1.2'
+ruby '3.1.3'
 
 gem 'activeadmin'
 gem 'active_model_serializers'
diff --git a/Gemfile.lock b/Gemfile.lock
index f7117308..6ea0489b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -724,7 +724,7 @@ DEPENDENCIES
   whenever
 
 RUBY VERSION
-   ruby 3.1.2p20
+   ruby 3.1.3p185
 
 BUNDLED WITH
    2.3.11