diff --git a/.github/workflows/deploy-docs.yml b/.github/workflows/deploy-docs.yml
index 7090835..f3df9fe 100644
--- a/.github/workflows/deploy-docs.yml
+++ b/.github/workflows/deploy-docs.yml
@@ -45,7 +45,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.4.10
+          ruby-version: 4.0.7
           bundler-cache: true
 
       - name: Configure bundler
diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 852d163..e64b50c 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -20,7 +20,7 @@ jobs:
       - uses: actions/checkout@v5
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.4.10
+          ruby-version: 4.0.7
           bundler-cache: true
       - name: config bundler
         run: |
@@ -37,7 +37,7 @@ jobs:
       - uses: actions/checkout@v5
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.4.10
+          ruby-version: 4.0.7
           bundler-cache: true
       - name: config bundler
         run: |
diff --git a/.ruby-version b/.ruby-version
index 84d6c67..d13e837 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.4.10
+4.0.6
diff --git a/Gemfile b/Gemfile
index c511803..546d2b2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,7 @@
 source 'https://rubygems.org'
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
-ruby '3.4.10'
+ruby '4.0.6'
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails', branch: 'main'
 gem 'rails', '~> 7.2.3'