diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 54c18e0..9cc4d20 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -49,15 +49,22 @@ jobs:
           - rails52.gemfile
           - rails60.gemfile
           - rails61.gemfile
+          - rails70.gemfile
         exclude:
           - ruby: '2.4'
             gemfile: rails60.gemfile
           - ruby: '2.4'
             gemfile: rails61.gemfile
+          - ruby: '2.4'
+            gemfile: rails70.gemfile
           - ruby: '2.5'
             gemfile: rails60.gemfile
           - ruby: '2.5'
             gemfile: rails61.gemfile
+          - ruby: '2.5'
+            gemfile: rails70.gemfile
+          - ruby: '2.6'
+            gemfile: rails70.gemfile
           - ruby: '3.0'
             gemfile: rails50.gemfile
           - ruby: '3.0'
diff --git a/Appraisals b/Appraisals
index 2600181..39d9819 100644
--- a/Appraisals
+++ b/Appraisals
@@ -1,26 +1,32 @@
 # frozen_string_literal: true
 
 appraise 'rails50' do
-  gem 'activerecord', '~> 5.0.0'
+  gem 'activerecord', '~> 5.0'
   gem 'sqlite3', '< 1.4'
 end
 
 appraise 'rails51' do
-  gem 'activerecord', '~> 5.1.0'
+  gem 'activerecord', '~> 5.1'
   gem 'sqlite3', '< 1.4'
 end
 
 appraise 'rails52' do
-  gem 'activerecord', '~> 5.2.0'
+  gem 'activerecord', '~> 5.2'
   gem 'sqlite3', '< 1.4'
 end
 
 if RUBY_VERSION >= '2.6.0'
   appraise 'rails60' do
-    gem 'activerecord', '~> 6.0.0'
+    gem 'activerecord', '~> 6.0'
   end
 
   appraise 'rails61' do
-    gem 'activerecord', '~> 6.1.0'
+    gem 'activerecord', '~> 6.1'
+  end
+end
+
+if RUBY_VERSION >= '2.7.0'
+  appraise 'rails70' do
+    gem 'activerecord', '~> 7.0'
   end
 end
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f07e1df..f968f2c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ### Features
 
 * Ruby 3.1 をサポートに追加 (PR [#54](https://github.com/chocoby/jp_prefecture/pull/54)/[@chocoby](https://github.com/chocoby))
+* Rails 7.0 をサポート (PR [#55](https://github.com/chocoby/jp_prefecture/pull/55)/[@chocoby](https://github.com/chocoby))
 
 ## 1.0.0 (2021-02-24)
 
diff --git a/README.md b/README.md
index 4bd7b6c..b4db2e5 100644
--- a/README.md
+++ b/README.md
@@ -211,7 +211,7 @@ $ gem install jp_prefecture
 ## サポートしているバージョン
 
 * Ruby: 2.4 - 3.1
-* Rails: 5.0 - 6.1
+* Rails: 5.0 - 7.0
 
 これより古い Ruby/Rails バージョンを使用する場合は、[`v0.11.0`](https://github.com/chocoby/jp_prefecture/tree/0.x) を利用してください。
 
diff --git a/README_EN.md b/README_EN.md
index 3d98e5c..0d05642 100644
--- a/README_EN.md
+++ b/README_EN.md
@@ -214,7 +214,7 @@ $ gem install jp_prefecture
 ## Supported versions
 
 * Ruby: 2.4 - 3.1
-* Rails: 5.0 - 6.1
+* Rails: 5.0 - 7.0
 
 If you are using an older Ruby/Rails version, please use [`v0.11.0`](https://github.com/chocoby/jp_prefecture/tree/0.x).
 
diff --git a/gemfiles/rails50.gemfile b/gemfiles/rails50.gemfile
index a2fd77d..62b709b 100644
--- a/gemfiles/rails50.gemfile
+++ b/gemfiles/rails50.gemfile
@@ -4,7 +4,7 @@
 
 source 'https://rubygems.org'
 
-gem 'activerecord', '~> 5.0.0'
+gem 'activerecord', '~> 5.0'
 gem 'sqlite3', '< 1.4'
 
 gemspec path: '../'
diff --git a/gemfiles/rails51.gemfile b/gemfiles/rails51.gemfile
index 8e892b6..6da260e 100644
--- a/gemfiles/rails51.gemfile
+++ b/gemfiles/rails51.gemfile
@@ -4,7 +4,7 @@
 
 source 'https://rubygems.org'
 
-gem 'activerecord', '~> 5.1.0'
+gem 'activerecord', '~> 5.1'
 gem 'sqlite3', '< 1.4'
 
 gemspec path: '../'
diff --git a/gemfiles/rails52.gemfile b/gemfiles/rails52.gemfile
index 1f1680f..abf988f 100644
--- a/gemfiles/rails52.gemfile
+++ b/gemfiles/rails52.gemfile
@@ -4,7 +4,7 @@
 
 source 'https://rubygems.org'
 
-gem 'activerecord', '~> 5.2.0'
+gem 'activerecord', '~> 5.2'
 gem 'sqlite3', '< 1.4'
 
 gemspec path: '../'
diff --git a/gemfiles/rails60.gemfile b/gemfiles/rails60.gemfile
index 24cd4fd..852b24f 100644
--- a/gemfiles/rails60.gemfile
+++ b/gemfiles/rails60.gemfile
@@ -4,6 +4,6 @@
 
 source 'https://rubygems.org'
 
-gem 'activerecord', '~> 6.0.0'
+gem 'activerecord', '~> 6.0'
 
 gemspec path: '../'
diff --git a/gemfiles/rails61.gemfile b/gemfiles/rails61.gemfile
index 8ee0e32..3e16a96 100644
--- a/gemfiles/rails61.gemfile
+++ b/gemfiles/rails61.gemfile
@@ -4,6 +4,6 @@
 
 source 'https://rubygems.org'
 
-gem 'activerecord', '~> 6.1.0'
+gem 'activerecord', '~> 6.1'
 
 gemspec path: '../'
diff --git a/gemfiles/rails70.gemfile b/gemfiles/rails70.gemfile
new file mode 100644
index 0000000..cffa6d1
--- /dev/null
+++ b/gemfiles/rails70.gemfile
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+# This file was generated by Appraisal
+
+source 'https://rubygems.org'
+
+gem 'activerecord', '~> 7.0'
+
+gemspec path: '../'