diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
index 5207cfb7..5e9ad82a 100644
--- a/.github/workflows/benchmark.yml
+++ b/.github/workflows/benchmark.yml
@@ -1,4 +1,3 @@
----
 name: CodSpeed
 
 on:
@@ -17,11 +16,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: "actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd" # v6.0.2
+        with:
+          persist-credentials: false
 
       - name: Install uv
         uses: astral-sh/setup-uv@5a095e7a2014a4212f075830d4f7277575a9d098 # v7.3.1
         with:
           python-version: "3.13"
+          enable-cache: true
 
       - name: Install dependencies
         run: scripts/install
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 70807e1f..82d77727 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -1,4 +1,3 @@
----
 name: Test Suite
 
 on:
@@ -13,6 +12,9 @@ jobs:
     runs-on: "${{ matrix.os }}"
     timeout-minutes: 10
 
+    permissions:
+      contents: read
+
     strategy:
       fail-fast: false
       matrix:
@@ -21,6 +23,8 @@ jobs:
 
     steps:
       - uses: "actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd" # v6.0.2
+        with:
+          persist-credentials: false
 
       - name: Install uv
         uses: astral-sh/setup-uv@5a095e7a2014a4212f075830d4f7277575a9d098 # v7.3.1
@@ -53,6 +57,10 @@ jobs:
     if: always()
     needs: [tests]
     runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+
     steps:
       - name: Decide whether the needed jobs succeeded or failed
         uses: re-actors/alls-green@05ac9388f0aebcb5727afa17fcccfecd6f8ec5fe # v1.2.2
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index a252a87f..a369d210 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -10,14 +10,19 @@ jobs:
   build:
     runs-on: ubuntu-latest
 
+    permissions:
+      contents: read
+
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
 
       - name: Install uv
         uses: astral-sh/setup-uv@5a095e7a2014a4212f075830d4f7277575a9d098 # v7.3.1
         with:
           python-version: "3.11"
-          enable-cache: true
+          enable-cache: false
 
       - name: Install dependencies
         run: scripts/install
@@ -67,7 +72,9 @@ jobs:
       contents: write
 
     steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      # `mkdocs gh-deploy` pushes the built docs to `gh-pages`, so this job needs
+      # a real checkout with the authenticated origin remote preserved.
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2  # zizmor: ignore[artipacked]
       - name: Download artifacts
         uses: actions/download-artifact@70fc10c6e5e1ce46ad2ea6f2b72d43f7d47b13c3 # v8.0.0
         with:
@@ -83,7 +90,7 @@ jobs:
         uses: astral-sh/setup-uv@5a095e7a2014a4212f075830d4f7277575a9d098 # v7.3.1
         with:
           python-version: "3.12"
-          enable-cache: true
+          enable-cache: false
 
       - name: Install dependencies
         run: scripts/install
@@ -95,12 +102,17 @@ jobs:
     runs-on: ubuntu-latest
     needs: build
 
+    permissions:
+      contents: read
+
     environment:
       name: cloudflare
       url: https://uvicorn.dev
 
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
       - name: Download artifacts
         uses: actions/download-artifact@70fc10c6e5e1ce46ad2ea6f2b72d43f7d47b13c3 # v8.0.0
         with:
diff --git a/.github/workflows/zizmor.yml b/.github/workflows/zizmor.yml
new file mode 100644
index 00000000..0950d527
--- /dev/null
+++ b/.github/workflows/zizmor.yml
@@ -0,0 +1,27 @@
+name: GitHub Actions Security Analysis
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["**"]
+
+permissions: {}
+
+jobs:
+  zizmor:
+    runs-on: ubuntu-latest
+
+    permissions:
+      security-events: write # Required for upload-sarif (used by zizmor-action) to upload SARIF files.
+      contents: read # Only needed for private repos. Needed to clone the repo.
+      actions: read # Only needed for private repos. Needed for upload-sarif to read workflow run info.
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: Run zizmor 🌈
+        uses: zizmorcore/zizmor-action@71321a20a9ded102f6e9ce5718a2fcec2c4f70d8 # v0.5.2