diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index dad311c..f44ee5b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -45,3 +45,29 @@ jobs:
           agent-rules-kit budget tests/fixtures/repositories/single-agent
           agent-rules-kit explain AIRK-GOV003
           agent-rules-kit explain --list
+
+  compatibility-checks:
+    name: compatibility / Python ${{ matrix.python-version }}
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version:
+          - "3.13"
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v6
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install project and dev dependencies
+        run: python -m pip install -e '.[dev]'
+
+      - name: Run local checks
+        run: ./scripts/check.sh
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d4cd90b..f249f22 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@ This project has a published GitHub Release line, but no stable support or API g
 
 ### Added
 
+- Added a non-required Python 3.13 compatibility CI job without changing the protected Python 3.12 required check name.
 - Added a local post-release audit script for repeatable maintainer verification.
 - Documented the v0.3.0 post-release audit findings and v0.3.1 maintenance hardening target.