diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5fa36cc..d2da862 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,11 +6,13 @@ on:
       - main
   pull_request:
 
+permissions: {}
+
 jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           persist-credentials: false
 
@@ -25,7 +27,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       with:
         persist-credentials: false
 
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 78e66e7..18b0575 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -5,11 +5,13 @@ on:
 
 name: release
 
+permissions: {}
+
 jobs:
   release:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           persist-credentials: false
 
diff --git a/.github/workflows/zizmor.yml b/.github/workflows/zizmor.yml
index 4bcfb80..8777b33 100644
--- a/.github/workflows/zizmor.yml
+++ b/.github/workflows/zizmor.yml
@@ -6,6 +6,8 @@ on:
   pull_request:
     branches: ["**"]
 
+permissions: {}
+
 jobs:
   zizmor:
     name: zizmor latest via Cargo
@@ -17,12 +19,12 @@ jobs:
       actions: read
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           persist-credentials: false
 
       - name: Install the latest version of uv
-        uses: astral-sh/setup-uv@v5
+        uses: astral-sh/setup-uv@6b9c6063abd6010835644d4c2e1bef4cf5cd0fca # v6.0.1
 
       - name: Run zizmor 🌈
         run: uvx zizmor --format sarif . > results.sarif
@@ -30,7 +32,7 @@ jobs:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Upload SARIF file
-        uses: github/codeql-action/upload-sarif@v3
+        uses: github/codeql-action/upload-sarif@60168efe1c415ce0f5521ea06d5c2062adbeed1b # v3.28.17
         with:
           sarif_file: results.sarif
           category: zizmor