diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index f38bfe56..78fbb239 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -19,7 +19,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '3.2'
+          ruby-version: '4.0.1'
           bundler-cache: true
 
       - name: Spec
diff --git a/.ruby-version b/.ruby-version
index 0aec50e6..1454f6ed 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.1.4
+4.0.1