diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..2c48305
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,11 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    groups:
+      github-actions:
+        patterns: ["*"]
+    schedule:
+      interval: "weekly"
+    cooldown:
+      default-days: 7
diff --git a/.github/workflows/flag-new-top-level.yml b/.github/workflows/flag-new-top-level.yml
index c3a5c2d..21cce68 100644
--- a/.github/workflows/flag-new-top-level.yml
+++ b/.github/workflows/flag-new-top-level.yml
@@ -25,14 +25,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
         with:
           sparse-checkout: |
             .github/new-top-level-flag.md
           sparse-checkout-cone-mode: false
 
       - name: Flag unexpected new top-level entries
-        uses: actions/github-script@v7
+        uses: actions/github-script@f28e40c7f34bde8b3046d885e986cb6290c5673b # v7.1.0
         with:
           script: |
             const fs = require('fs');
diff --git a/.github/workflows/guard-custom-layer.yml b/.github/workflows/guard-custom-layer.yml
index c061389..64716e3 100644
--- a/.github/workflows/guard-custom-layer.yml
+++ b/.github/workflows/guard-custom-layer.yml
@@ -30,14 +30,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
         with:
           sparse-checkout: |
             .github/custom-layer-autoclose.md
           sparse-checkout-cone-mode: false
 
       - name: Close PR if it touches the custom layer
-        uses: actions/github-script@v7
+        uses: actions/github-script@f28e40c7f34bde8b3046d885e986cb6290c5673b # v7.1.0
         with:
           script: |
             const fs = require('fs');
diff --git a/.github/workflows/knowledge-index.yml b/.github/workflows/knowledge-index.yml
index 71acfcb..0b8765b 100644
--- a/.github/workflows/knowledge-index.yml
+++ b/.github/workflows/knowledge-index.yml
@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
 
       - name: Validate knowledge-index generator
         shell: pwsh
diff --git a/.github/workflows/release-version.yml b/.github/workflows/release-version.yml
index 36f80f3..ad29dae 100644
--- a/.github/workflows/release-version.yml
+++ b/.github/workflows/release-version.yml
@@ -34,7 +34,7 @@ jobs:
   release:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/review-fixtures.yml b/.github/workflows/review-fixtures.yml
index fff9cd0..f20011b 100644
--- a/.github/workflows/review-fixtures.yml
+++ b/.github/workflows/review-fixtures.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
 
       - name: Validate review evaluation corpus
         shell: pwsh
diff --git a/.github/workflows/validate-frontmatter.yml b/.github/workflows/validate-frontmatter.yml
index 1a66239..17cbbf6 100644
--- a/.github/workflows/validate-frontmatter.yml
+++ b/.github/workflows/validate-frontmatter.yml
@@ -11,10 +11,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
 
       - name: Set up Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
         with:
           python-version: "3.12"