diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 04e9069c..169e7860 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -45,6 +45,44 @@ jobs:
           flags: python
           name: python-coverage
 
+  security-scan:
+    name: Security scan
+    runs-on: ubuntu-latest
+    # Informational only — like Codecov, this never fails CI. It surfaces known
+    # dependency vulnerabilities (Python + frontend) in the job logs.
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: "3.13"
+          cache: pip
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: "22"
+          cache: npm
+          cache-dependency-path: web-src/package-lock.json
+
+      - name: Audit Python dependencies (pip-audit)
+        continue-on-error: true
+        run: |
+          pip install pip-audit
+          pip-audit --requirement requirements.txt --desc
+
+      - name: Audit frontend dependencies (npm audit)
+        continue-on-error: true
+        working-directory: web-src
+        run: |
+          echo "::group::Production dependencies"
+          npm audit --omit=dev || true
+          echo "::endgroup::"
+          echo "::group::All dependencies (incl. dev/build tooling)"
+          npm audit || true
+          echo "::endgroup::"
+
   frontend-tests:
     name: Frontend (Node 22)
     runs-on: ubuntu-latest
diff --git a/README.md b/README.md
index e79e2f09..48790d16 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,13 @@
 
 ## What's new in this fork
 
+### 2026-06-24 — Dependency security scan in CI
+
+A `Security scan` job audits dependencies on every push/PR: `pip-audit` for the
+Python requirements and `npm audit` for the frontend (production deps reported
+separately from dev/build tooling). It is **informational** — like Codecov, it
+never fails CI; findings are surfaced in the job logs.
+
 ### 2026-06-19 — Favorite scripts
 
 Scripts can be pinned as favorites for quick access. A star button on each script