diff --git a/.claude/rules/development.md b/.claude/rules/development.md
index cca6fed..1ab9faf 100644
--- a/.claude/rules/development.md
+++ b/.claude/rules/development.md
@@ -81,7 +81,8 @@ Run `bash maintain.sh` from the repository root. The authoritative type gate is
 
 The security scanner's exit status is authoritative, including a failure after a success
 message. `tests/test_maintenance.py` checks clean, vulnerable, and broken scanner
-runs through the real shell entry point. Recheck unresolved advisories using the
+runs through the real shell entry point, and pins the CI `security` job to the
+same scanner line with no `continue-on-error`. Recheck unresolved advisories using the
 procedure in `docs/development.md`; do not revive the old text-matching bypass.
 
 Boundary modules for cv2, Torch, and Diffusers may carry narrow per-file relaxations for unknown third-party types. Keep pure-logic files strict, preserve the local piexif stub, and fix real errors before widening a pragma.
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index d370fe6..37c4a82 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -29,6 +29,19 @@ jobs:
       - name: Ruff format check
         run: uv run ruff format --check
 
+  security:
+    name: lockfile vulnerability scan
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@v7
+      - uses: astral-sh/setup-uv@v7
+        with:
+          enable-cache: false
+      # Policy and triaged blocks: docs/development.md "Known security-gate blocks".
+      - name: Scan uv.lock with uv-secure
+        run: uvx uv-secure uv.lock
+
   test:
     name: test ${{ matrix.os }} py${{ matrix.python-version }}
     runs-on: ${{ matrix.os }}
diff --git a/README.md b/README.md
index 13f694c..31cb28b 100644
--- a/README.md
+++ b/README.md
@@ -571,7 +571,8 @@ bash maintain.sh
 ```
 
 See [module internals](docs/module-internals.md) before changing a subsystem
-with documented invariants.
+with documented invariants. Report vulnerabilities as described in
+[SECURITY.md](SECURITY.md).
 
 ## License
 
diff --git a/SECURITY.md b/SECURITY.md
new file mode 100644
index 0000000..272b5d8
--- /dev/null
+++ b/SECURITY.md
@@ -0,0 +1,25 @@
+# Security policy
+
+## Supported versions
+
+Security fixes go into the latest release. Older releases are not patched;
+upgrade through the channel you installed from (PyPI or Homebrew).
+
+## Reporting a vulnerability
+
+Report vulnerabilities privately through
+[GitHub private vulnerability reporting](https://github.com/wiltodelta/remove-ai-watermarks/security/advisories/new).
+Do not open a public issue for an unpatched vulnerability. Include the affected
+version, the command or API call, and a minimal input that reproduces it.
+
+Vulnerabilities in a dependency, such as a CVE in a package from `uv.lock`, can
+be reported as a regular issue when the advisory is already public.
+
+## Dependency vulnerabilities
+
+Dependabot raises alerts and update pull requests for `uv.lock` and GitHub
+Actions, and CI scans `uv.lock` with
+[`uv-secure`](https://github.com/owenlamont/uv-secure) on every push and pull
+request. A vulnerable dependency is upgraded to a fixed release; advisories
+without one are tracked under
+[Known security-gate blocks](docs/development.md#known-security-gate-blocks).
diff --git a/docs/development.md b/docs/development.md
index b46633a..9501e2f 100644
--- a/docs/development.md
+++ b/docs/development.md
@@ -29,7 +29,7 @@ Do not add advisory ignores or suppress the scanner's exit status. Run and
 report Ruff, Pyright scoped to `src/`, and tests separately when security blocks
 the gate.
 
-Rechecked on 2026-09-10 against the locked versions and the advisory sources:
+Rechecked on 2026-10-02 against the locked versions and the advisory sources:
 
 - `lightning` and `pytorch-lightning`, pulled by the optional `trustmark`
   extra, are pinned to 2.6.6. That release clears PYSEC-2026-3624 and
@@ -37,18 +37,19 @@ Rechecked on 2026-09-10 against the locked versions and the advisory sources:
 - `accelerate`, required by the diffusion stack, is affected by
   [GHSA-4j2p-28q2-5m79](https://github.com/advisories/GHSA-4j2p-28q2-5m79)
   and PYSEC-2026-3804. The sharded-checkpoint loader accepts unsafe
-  `weight_map` paths; neither advisory lists a patched release. 1.15.0 is
-  on PyPI and is outside the advisory's `<= 1.14.0` range, but its
+  `weight_map` paths; neither advisory lists a patched release. The lock
+  carries 1.15.0, which is outside the advisory's `<= 1.14.0` range, so the
+  scanner no longer blocks the gate. Its
   `load_checkpoint_in_model` still joins `weight_map` entries with no
   containment check, and the sanitizer PRs
   ([#4138](https://github.com/huggingface/accelerate/pull/4138),
-  [#4214](https://github.com/huggingface/accelerate/pull/4214)) did not
-  land. Do not bump solely to silence the scanner. The project has no
+  [#4214](https://github.com/huggingface/accelerate/pull/4214)) were closed
+  without merging. Do not treat the passing scan as a fix. The project has no
   direct call to `load_checkpoint_in_model` or
   `load_checkpoint_and_dispatch`, but this does not prove indirect
   model-loading paths are unaffected.
 
-Before carrying the remaining block forward, rerun `uvx uv-secure uv.lock` and check
+When a new block appears, or before carrying one forward, rerun `uvx uv-secure uv.lock` and check
 PyPI for a fixed release. Upgrade a fixed package with
 `uv lock --upgrade-package <package>` and rerun the gate. Removing the current
 dependency would remove a supported optional feature, so that is not a
@@ -98,6 +99,11 @@ run the full-clip video test. Diffusion and model-running tests skip in that
 matrix; metadata, identification, visible removal, the DWT-DCT decoder, and the
 OpenCV eraser remain covered across operating systems.
 
+A separate `security` job runs the `maintain.sh` lockfile scan, so an advisory
+without a released fix turns `main` red; see
+[Known security-gate blocks](#known-security-gate-blocks). Vulnerability
+reporting is described in [`SECURITY.md`](../SECURITY.md).
+
 Keep `uv.lock` compatible with `uv sync --frozen`. Dependency pull-request checks use GitHub's merge result against current `main`; if `main` moves, merge it locally and rerun the full gate because a newer linter can expose stale directives in later code.
 
 `test.yml` runs one concurrency group per ref with `cancel-in-progress: true`, so a newer push cancels the previous run mid-flight. A cancelled run is not a failure verdict: the superseding run's head includes the cancelled commits as ancestors, so watch that run to completion instead of retrying the push.
diff --git a/tests/test_maintenance.py b/tests/test_maintenance.py
index ee1e586..0dd42ff 100644
--- a/tests/test_maintenance.py
+++ b/tests/test_maintenance.py
@@ -8,8 +8,10 @@ import subprocess
 from pathlib import Path
 
 import pytest
+import yaml
 
-GATE = Path(__file__).resolve().parents[1] / "maintain.sh"
+ROOT = Path(__file__).resolve().parents[1]
+GATE = ROOT / "maintain.sh"
 BASH = shutil.which("bash")
 pytestmark = pytest.mark.skipif(os.name != "posix" or BASH is None, reason="The maintenance entry point requires Bash")
 
@@ -65,3 +67,13 @@ def test_security_exit_status_controls_the_gate(tmp_path, scanner_output, scanne
     else:
         assert result.returncode == 0
         assert calls[-1] == "uv run pytest -n auto"
+
+
+def test_ci_runs_the_gate_security_scan_unweakened():
+    scan = next(line for line in GATE.read_text().splitlines() if line.startswith("uvx uv-secure"))
+    workflow = yaml.safe_load((ROOT / ".github/workflows/test.yml").read_text())
+    job = workflow["jobs"]["security"]
+    runs = [step["run"].strip() for step in job["steps"] if "run" in step]
+    assert runs == [scan]
+    assert not job.get("continue-on-error")
+    assert not any(step.get("continue-on-error") for step in job["steps"])