diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index edb1126..ec33481 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -40,7 +40,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@8e41b362d2589a22a44c1cfa214b3c83052c195b # v1.318.0
         with:
-          ruby-version: '4.0.5'
+          ruby-version: '4.0.6'
       - name: Bundle install
         working-directory: v2.5-non-rails
         env:
@@ -107,7 +107,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@8e41b362d2589a22a44c1cfa214b3c83052c195b # v1.318.0
         with:
-          ruby-version: '4.0.5'
+          ruby-version: '4.0.6'
       - name: Bundle install
         working-directory: v2.5-rails
         env:
diff --git a/v2.5-non-rails/.ruby-version b/v2.5-non-rails/.ruby-version
index 7636e75..d13e837 100644
--- a/v2.5-non-rails/.ruby-version
+++ b/v2.5-non-rails/.ruby-version
@@ -1 +1 @@
-4.0.5
+4.0.6
diff --git a/v2.5-rails/.ruby-version b/v2.5-rails/.ruby-version
index 7636e75..d13e837 100644
--- a/v2.5-rails/.ruby-version
+++ b/v2.5-rails/.ruby-version
@@ -1 +1 @@
-4.0.5
+4.0.6