diff --git a/.github/workflows/adoption-harness.yml b/.github/workflows/adoption-harness.yml
index d29218f..f5c1fb9 100644
--- a/.github/workflows/adoption-harness.yml
+++ b/.github/workflows/adoption-harness.yml
@@ -32,7 +32,7 @@ jobs:
       ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
       SHIPGATE_HARNESS_BUDGET_USD: ${{ inputs.budget_usd }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - uses: actions/setup-python@v5
@@ -72,7 +72,7 @@ jobs:
     # the pipeline. PR CI exercises the same code via tests/harness/.
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version: "3.13"