diff --git a/README.md b/README.md
index 944a7790..854cf543 100644
--- a/README.md
+++ b/README.md
@@ -420,6 +420,10 @@ Will not show up if no `.readthedocs.yml`/`.readthedocs.yaml` file is present.
 - `RF201`: Avoid using deprecated config settings
 - `RF202`: Use (new) lint config section
 
+### Security
+
+- [`SEC001`](https://learn.scientific-python.org/development/guides/security#SEC001): Use zizmor to check the GitHub Actions
+
 ### Setuptools Config
 
 Will not show up if no `setup.cfg` file is present.
diff --git a/docs/guides/index.md b/docs/guides/index.md
index c3ecc900..f49187ec 100644
--- a/docs/guides/index.md
+++ b/docs/guides/index.md
@@ -18,7 +18,8 @@ A section on CI follows, with a [general setup guide][gha_basic], and then two
 choices for using CI to distribute your package, one for
 [pure Python][gha_pure], and one for [compiled extensions][gha_wheels]. You can
 read about setting up good tests on the [pytest page][pytest], with
-[coverage][]. There's also a page on setting up [docs][], as well.
+[coverage][]. There's also a page on setting up [docs][], as well as a page on
+[security][] best practices.
 
 :::{tip} New project template
 Once you have completed the guidelines, there is a
@@ -45,6 +46,7 @@ WebAssembly! All checks point to a linked badge in the guide.
 [gha_basic]:          guides/gha-basic
 [gha_pure]:           guides/gha-pure
 [gha_wheels]:         guides/gha-wheels
+[security]:           guides/security
 [pytest]:             guides/pytest
 [right in the guide]: guides/repo-review
 
diff --git a/docs/guides/security.md b/docs/guides/security.md
new file mode 100644
index 00000000..d51e7eff
--- /dev/null
+++ b/docs/guides/security.md
@@ -0,0 +1,110 @@
+---
+short_title: Security
+---
+
+# Security
+
+Supply-chain and CI security are increasingly important for scientific Python
+projects; new attacks are targeting smaller packages than ever before thanks to
+the ease with which exploits can be found and utilized with AI. The first six
+months of 2026 had 4.5x the malitoius package volume of _all_ of 2025[^1].
+
+[^1]: <https://phoenix.security/accelerating-supply-chain-attacks-npm-pypi-vsx-ai-enabled-2026/>
+
+Most of these attacks strung together smaller vulerabilties into something
+exploitable, often in CI like GitHub Actions. Once in, the attacks upload
+malitious packages that spread the attack via PyPI or NPM.
+
+This page has recommendations for keeping your repository and its automation
+secure. This will never be complete, but even a few small steps can make your
+code much more secure.
+
+## GitHub Actions
+
+{rr}`SEC001` GitHub Actions workflows are a common source of security issues,
+due to how commonly it is used, and it's original design being focused on ease
+of use and convenience.
+
+Common security problems:
+
+* Action moving references, like `@v1`, or tags, like `@v1.0.1`, can be pushed
+  if an attacker comprimizes the action repository you are using. If you use
+  full 40 character SHA's, these cannot be modified. (Official actions are
+  likely okay, but important for third party actions). There's even a GitHub
+  setting to require this. It's conventional to include the tag as a trailing
+  comment.
+* Action SHA references can be added by a fork. If you make a fork of
+  `actions/checkout`, you can reference _your_ SHA via
+  `actions/checkout@<SHA>`. Only accept SHAs you have verified or a tool (like
+  dependabot) produce. If you use Zizmor, it can also verify that an SHA matches
+  a tag, tags cannot be pulled from a fork.
+* Caching is dangerous. Attackers can poison an unrelated cache. Avoid caching
+  in your release jobs.
+* `pull_request_target` is really dangerous. Attackers can use it to poison
+  caches, for example.
+* Tighten default permissions. A job should not have permissions to do anything
+  it doesn't need. Set the default in settings to read-only, then explicitly
+  grant required permissions.
+* Don't build code in your release job. The release job should do _as little as
+  possible_.
+* Use trusted publishing. There's no long-lived token to steal.
+
+:::{note}
+
+This guide and cookiecutter does _not_ use SHA pinning to make it easier to
+read and maintain. You can convert to SHA with tools like
+[`npx actions-up`](https://github.com/azat-io/actions-up).
+
+:::
+
+### Zizmor
+
+[zizmor](https://docs.zizmor.sh) is a static analysis tool that audits your
+workflows for common problems, including many of the ones above. You can run
+it as a pre-commit hook or as a GitHub Action:
+
+::::{tab-set}
+:::{tab-item} pre-commit
+
+```yaml
+- repo: https://github.com/zizmorcore/zizmor-pre-commit
+  rev: "v1.26.1"
+  hooks:
+    - id: zizmor
+```
+
+:::
+:::{tab-item} GitHub Actions
+
+```yaml
+name: zizmor
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+permissions: {}
+
+jobs:
+  zizmor:
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write
+    steps:
+      - uses: actions/checkout@v7
+        with:
+          persist-credentials: false
+
+      - uses: zizmorcore/zizmor-action@v0.5.7
+```
+
+The [`zizmorcore/zizmor-action`](https://github.com/zizmorcore/zizmor-action)
+GitHub Action can upload its findings to GitHub's code scanning dashboard.
+
+:::
+::::
+
+You can silence individual findings with `# zizmor: ignore[rule]` comments, or
+collect them in a [`zizmor.yml`](https://docs.zizmor.sh/configuration/) config
+file.
diff --git a/docs/myst.yml b/docs/myst.yml
index 0a470973..ed00f642 100644
--- a/docs/myst.yml
+++ b/docs/myst.yml
@@ -30,6 +30,7 @@ project:
         - file: guides/gha_basic.md
         - file: guides/gha_pure.md
         - file: guides/gha_wheels.md
+        - file: guides/security.md
         - file: guides/tasks.md
     - file: principles/index.md
       children:
diff --git a/noxfile.py b/noxfile.py
index 0e100000..34e4f958 100755
--- a/noxfile.py
+++ b/noxfile.py
@@ -426,6 +426,7 @@ def pc_bump(session: nox.Session) -> None:
     versions = {}
     pages = [
         Path("docs/guides/style.md"),
+        Path("docs/guides/security.md"),
         Path("{{cookiecutter.project_name}}/.pre-commit-config.yaml"),
         Path(".pre-commit-config.yaml"),
     ]
diff --git a/pyproject.toml b/pyproject.toml
index 9fd7904a..99c9ec74 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -68,6 +68,7 @@ precommit = "sp_repo_review.checks.precommit:repo_review_checks"
 ruff = "sp_repo_review.checks.ruff:repo_review_checks"
 mypy = "sp_repo_review.checks.mypy:repo_review_checks"
 github = "sp_repo_review.checks.github:repo_review_checks"
+security = "sp_repo_review.checks.security:repo_review_checks"
 readthedocs = "sp_repo_review.checks.readthedocs:repo_review_checks"
 setupcfg = "sp_repo_review.checks.setupcfg:repo_review_checks"
 noxfile = "sp_repo_review.checks.noxfile:repo_review_checks"
diff --git a/src/sp_repo_review/checks/security.py b/src/sp_repo_review/checks/security.py
new file mode 100644
index 00000000..b11de41c
--- /dev/null
+++ b/src/sp_repo_review/checks/security.py
@@ -0,0 +1,55 @@
+# SEC: Security
+## SEC0xx: GitHub Actions security
+
+from __future__ import annotations
+
+from typing import Any
+
+from . import mk_url
+
+
+class Security:
+    family = "security"
+
+
+class SEC001(Security):
+    "Use zizmor to check the GitHub Actions"
+
+    requires = {"GH100"}
+    url = mk_url("security")
+
+    @staticmethod
+    def check(precommit: dict[str, Any], workflows: dict[str, Any]) -> bool:
+        """
+        Projects with GitHub Actions should statically analyze their workflows
+        with [zizmor](https://docs.zizmor.sh), which catches common security
+        issues such as template injection, excessive permissions, and
+        credential persistence. The simplest way is to add the pre-commit hook:
+
+        ```yaml
+        - repo: https://github.com/zizmorcore/zizmor-pre-commit
+          rev: v1.26.1
+          hooks:
+            - id: zizmor
+        ```
+
+        You can also run it as the `zizmorcore/zizmor-action` GitHub Action.
+        """
+        for repo_item in precommit.get("repos", []):
+            if (
+                repo_item.get("repo", "").lower()
+                == "https://github.com/zizmorcore/zizmor-pre-commit"
+            ):
+                return True
+        for workflow in workflows.values():
+            for job in workflow.get("jobs", {}).values():
+                if not isinstance(job, dict):
+                    continue
+                for step in job.get("steps", []):
+                    if step.get("uses", "").startswith("zizmorcore/zizmor-action"):
+                        return True
+        return False
+
+
+def repo_review_checks() -> dict[str, Security]:
+    return {p.__name__: p() for p in Security.__subclasses__()}
diff --git a/src/sp_repo_review/families.py b/src/sp_repo_review/families.py
index b5297cbe..2dbbf5c1 100644
--- a/src/sp_repo_review/families.py
+++ b/src/sp_repo_review/families.py
@@ -114,6 +114,9 @@ def get_families(
         "github": Family(
             name="GitHub Actions",
         ),
+        "security": Family(
+            name="Security",
+        ),
         "pre-commit": Family(
             name="Pre-commit",
             readme_note="Will not show up if using lefthook instead of pre-commit/prek.",
diff --git a/tests/test_security.py b/tests/test_security.py
new file mode 100644
index 00000000..63f5bc98
--- /dev/null
+++ b/tests/test_security.py
@@ -0,0 +1,41 @@
+import yaml
+from repo_review.testing import compute_check
+
+
+def test_sec001_precommit() -> None:
+    precommit = yaml.safe_load(
+        """
+        repos:
+          - repo: https://github.com/zizmorcore/zizmor-pre-commit
+            rev: v1.22.0
+            hooks:
+              - id: zizmor
+        """
+    )
+    assert compute_check("SEC001", precommit=precommit, workflows={"ci": {}}).result
+
+
+def test_sec001_action() -> None:
+    workflows = yaml.safe_load(
+        """
+        zizmor:
+          jobs:
+            zizmor:
+              steps:
+                - uses: zizmorcore/zizmor-action@v0.5.6
+        """
+    )
+    assert compute_check("SEC001", precommit={}, workflows=workflows).result
+
+
+def test_sec001_missing() -> None:
+    precommit = yaml.safe_load(
+        """
+        repos:
+          - repo: https://github.com/astral-sh/ruff-pre-commit
+            rev: v0.15.16
+            hooks:
+              - id: ruff-check
+        """
+    )
+    assert not compute_check("SEC001", precommit=precommit, workflows={"ci": {}}).result
diff --git a/{{cookiecutter.project_name}}/.github/dependabot.yml b/{{cookiecutter.project_name}}/.github/dependabot.yml
index 6c4b3695..01703d62 100644
--- a/{{cookiecutter.project_name}}/.github/dependabot.yml
+++ b/{{cookiecutter.project_name}}/.github/dependabot.yml
@@ -5,6 +5,8 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly"
+    cooldown:
+      default-days: 7
     groups:
       actions:
         patterns:
diff --git a/{{cookiecutter.project_name}}/.github/workflows/ci.yml b/{{cookiecutter.project_name}}/.github/workflows/ci.yml
index 59e969f7..32dc428d 100644
--- a/{{cookiecutter.project_name}}/.github/workflows/ci.yml
+++ b/{{cookiecutter.project_name}}/.github/workflows/ci.yml
@@ -7,6 +7,8 @@ on:
     branches:
       - main
 
+permissions: {}
+
 concurrency:
   group: {% raw %}${{ github.workflow }}-${{ github.ref }}{% endraw %}
   cancel-in-progress: true
@@ -21,10 +23,13 @@ jobs:
   lint:
     name: Format
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
     steps:
       - uses: actions/checkout@v7
-      {%- if cookiecutter.vcs %}
         with:
+          persist-credentials: false
+      {%- if cookiecutter.vcs %}
           fetch-depth: 0
       {%- endif %}
 
@@ -45,6 +50,8 @@ jobs:
     {%- if cookiecutter.__type == "compiled" %}
     needs: [lint]
     {%- endif %}
+    permissions:
+      contents: read
     strategy:
       fail-fast: false
       matrix:
@@ -57,8 +64,9 @@ jobs:
 
     steps:
       - uses: actions/checkout@v7
-      {%- if cookiecutter.vcs %}
         with:
+          persist-credentials: false
+      {%- if cookiecutter.vcs %}
           fetch-depth: 0
       {%- endif %}
 
diff --git a/{{cookiecutter.project_name}}/.github/workflows/{% if cookiecutter.__type!='compiled' %}cd.yml{% endif %} b/{{cookiecutter.project_name}}/.github/workflows/{% if cookiecutter.__type!='compiled' %}cd.yml{% endif %}
index 20766cb3..9d33754e 100644
--- a/{{cookiecutter.project_name}}/.github/workflows/{% if cookiecutter.__type!='compiled' %}cd.yml{% endif %}	
+++ b/{{cookiecutter.project_name}}/.github/workflows/{% if cookiecutter.__type!='compiled' %}cd.yml{% endif %}	
@@ -10,6 +10,8 @@ on:
     types:
       - published
 
+permissions: {}
+
 concurrency:
   group: {% raw %}${{ github.workflow }}-${{ github.ref }}{% endraw %}
   cancel-in-progress: true
@@ -23,10 +25,13 @@ jobs:
   dist:
     name: Distribution build
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
 
     steps:
       - uses: actions/checkout@v7
         with:
+          persist-credentials: false
           fetch-depth: 0
 
       - uses: hynek/build-and-inspect-python-package@v2
diff --git a/{{cookiecutter.project_name}}/.github/workflows/{% if cookiecutter.__type=='compiled' %}cd.yml{% endif %} b/{{cookiecutter.project_name}}/.github/workflows/{% if cookiecutter.__type=='compiled' %}cd.yml{% endif %}
index 83b3f783..1385ce05 100644
--- a/{{cookiecutter.project_name}}/.github/workflows/{% if cookiecutter.__type=='compiled' %}cd.yml{% endif %}	
+++ b/{{cookiecutter.project_name}}/.github/workflows/{% if cookiecutter.__type=='compiled' %}cd.yml{% endif %}	
@@ -9,6 +9,8 @@ on:
     paths:
       - .github/workflows/cd.yml
 
+permissions: {}
+
 concurrency:
   group: {% raw %}${{ github.workflow }}-${{ github.ref }}{% endraw %}
   cancel-in-progress: true
@@ -22,9 +24,12 @@ jobs:
   make_sdist:
     name: Make SDist
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
     steps:
       - uses: actions/checkout@v7
         with:
+          persist-credentials: false
           fetch-depth: 0
 
       - name: Build SDist
@@ -38,6 +43,8 @@ jobs:
   build_wheels:
     name: {% raw %}Wheel on ${{ matrix.os }}{% endraw %}
     runs-on: {% raw %}${{ matrix.os }}{% endraw %}
+    permissions:
+      contents: read
     strategy:
       fail-fast: false
       matrix:
@@ -52,9 +59,13 @@ jobs:
     steps:
       - uses: actions/checkout@v7
         with:
+          persist-credentials: false
           fetch-depth: 0
 
       - uses: astral-sh/setup-uv@v8.2.0
+        with:
+          # Disable caching to avoid poisoning published wheels
+          enable-cache: false
 
       - uses: pypa/cibuildwheel@v4.1
 
diff --git a/{{cookiecutter.project_name}}/.github/{% if cookiecutter.__ci == 'github' %}zizmor.yml{% endif %} b/{{cookiecutter.project_name}}/.github/{% if cookiecutter.__ci == 'github' %}zizmor.yml{% endif %}
new file mode 100644
index 00000000..ab94a2af
--- /dev/null
+++ b/{{cookiecutter.project_name}}/.github/{% if cookiecutter.__ci == 'github' %}zizmor.yml{% endif %}	
@@ -0,0 +1,7 @@
+# Configuration for zizmor (https://docs.zizmor.sh)
+rules:
+  unpinned-uses:
+    config:
+      # Feel free to switch to hash pinning, then this can be removed.
+      policies:
+        "*": ref-pin
diff --git a/{{cookiecutter.project_name}}/.pre-commit-config.yaml b/{{cookiecutter.project_name}}/.pre-commit-config.yaml
index 30181c5e..e729bbf3 100644
--- a/{{cookiecutter.project_name}}/.pre-commit-config.yaml
+++ b/{{cookiecutter.project_name}}/.pre-commit-config.yaml
@@ -114,3 +114,11 @@ repos:
       - id: check-gitlab-ci
 {%- endif %}
       - id: check-readthedocs
+
+{%- if cookiecutter.__ci == "github" %}
+
+  - repo: https://github.com/zizmorcore/zizmor-pre-commit
+    rev: "v1.26.1"
+    hooks:
+      - id: zizmor
+{%- endif %}