diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4ead199..948e1fb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -38,9 +38,9 @@ jobs:
         with:
           fetch-depth: 0
       - name: Set up Ruby
-        uses: ruby/setup-ruby@26e5b7d197ebf60545ee9667bcbace0be11ccaec # v1.334.0
+        uses: ruby/setup-ruby@7f797815d8adceb1c412e7abefdd1ab4abc47a5f # v1.335.0
         with:
-          ruby-version: '4.0.8'
+          ruby-version: '4.0.9'
       - name: Bundle install
         working-directory: v2.6-non-rails
         env:
@@ -70,7 +70,7 @@ jobs:
       - name: Install package dependencies
         run: "[ -e $APT_DEPS ] || sudo apt-get install -y --no-install-recommends $APT_DEPS"
       - name: Set up Ruby
-        uses: ruby/setup-ruby@26e5b7d197ebf60545ee9667bcbace0be11ccaec # v1.334.0
+        uses: ruby/setup-ruby@7f797815d8adceb1c412e7abefdd1ab4abc47a5f # v1.335.0
         with:
           ruby-version: ${{matrix.ruby}}
           bundler: 'latest'
@@ -105,9 +105,9 @@ jobs:
         with:
           fetch-depth: 0
       - name: Set up Ruby
-        uses: ruby/setup-ruby@26e5b7d197ebf60545ee9667bcbace0be11ccaec # v1.334.0
+        uses: ruby/setup-ruby@7f797815d8adceb1c412e7abefdd1ab4abc47a5f # v1.335.0
         with:
-          ruby-version: '4.0.8'
+          ruby-version: '4.0.9'
       - name: Bundle install
         working-directory: v2.6-rails
         env:
@@ -137,7 +137,7 @@ jobs:
       - name: Install package dependencies
         run: "[ -e $APT_DEPS ] || sudo apt-get install -y --no-install-recommends $APT_DEPS"
       - name: Set up Ruby
-        uses: ruby/setup-ruby@26e5b7d197ebf60545ee9667bcbace0be11ccaec # v1.334.0
+        uses: ruby/setup-ruby@7f797815d8adceb1c412e7abefdd1ab4abc47a5f # v1.335.0
         with:
           ruby-version: ${{matrix.ruby}}
           bundler: 'latest'
diff --git a/v2.6-non-rails/.ruby-version b/v2.6-non-rails/.ruby-version
index a2cec7a..7919852 100644
--- a/v2.6-non-rails/.ruby-version
+++ b/v2.6-non-rails/.ruby-version
@@ -1 +1 @@
-4.0.8
+4.0.9
diff --git a/v2.6-rails/.ruby-version b/v2.6-rails/.ruby-version
index a2cec7a..7919852 100644
--- a/v2.6-rails/.ruby-version
+++ b/v2.6-rails/.ruby-version
@@ -1 +1 @@
-4.0.8
+4.0.9