diff --git a/.github/workflows/auto-merge.yml b/.github/workflows/auto-merge.yml
index 5c3c975..a9d6de3 100644
--- a/.github/workflows/auto-merge.yml
+++ b/.github/workflows/auto-merge.yml
@@ -19,7 +19,7 @@ jobs:
     timeout-minutes: 30
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       with:
         ref: "${{github.event.pull_request.base.sha}}"
     - name: Check if PR author is a code owner
diff --git a/lib/ghb/auto_merge_manager.rb b/lib/ghb/auto_merge_manager.rb
index 8c5b03d..b31c071 100644
--- a/lib/ghb/auto_merge_manager.rb
+++ b/lib/ghb/auto_merge_manager.rb
@@ -31,7 +31,7 @@ def save
         do_runs_on(DEFAULT_UBUNTU_VERSION)
 
         do_step('Checkout') do
-          do_uses('actions/checkout@v4')
+          do_uses('actions/checkout@v6')
           do_with(
             {
               ref: '${{github.event.pull_request.base.sha}}'
diff --git a/spec/ghb/auto_merge_manager_spec.rb b/spec/ghb/auto_merge_manager_spec.rb
index 836a889..c5bb1de 100644
--- a/spec/ghb/auto_merge_manager_spec.rb
+++ b/spec/ghb/auto_merge_manager_spec.rb
@@ -69,7 +69,7 @@
 
       checkout_step = auto_merge_workflow.jobs[:enable_automerge].steps.find { |s| s.name == 'Checkout' }
       expect(checkout_step).not_to(be_nil)
-      expect(checkout_step.uses).to(eq('actions/checkout@v4'))
+      expect(checkout_step.uses).to(eq('actions/checkout@v6'))
       expect(checkout_step.with[:ref]).to(eq('${{github.event.pull_request.base.sha}}'))
     end