diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 09f4568..3239b02 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -8,3 +8,15 @@ updates:
       bundler:
         patterns:
           - "*"
+    cooldown:
+      default-days: 7
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+    groups:
+      github-actions:
+        patterns:
+          - "*"
+    cooldown:
+      default-days: 7
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index dfeadec..b16a36d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,8 +23,10 @@ jobs:
     name: "Tests: Ruby ${{ matrix.ruby }}"
     steps:
       - uses: actions/checkout@5126516654c75f76bca1de45dd82a3006d8890f9
+        with:
+          persist-credentials: false
       - name: Set up Ruby ${{ matrix.ruby }}
-        uses: ruby/setup-ruby@v1
+        uses: ruby/setup-ruby@14594264cd68ce8a2345dd349bc3d138a4ef85c8 # v1.327.0
         with:
           bundler-cache: true
           ruby-version: ${{ matrix.ruby }}
@@ -35,8 +37,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@5126516654c75f76bca1de45dd82a3006d8890f9
+        with:
+          persist-credentials: false
       - name: Rubyfmt
-        uses: rubyatscale/rubyfmt-action@v1
+        uses: rubyatscale/rubyfmt-action@cf0cfc65bb8cab4c628ffea8662892598a48d6d3 # v1.0.0
         with:
           paths: |
             lib/
diff --git a/.github/workflows/push_gem.yml b/.github/workflows/push_gem.yml
index 8f921f6..06864c5 100644
--- a/.github/workflows/push_gem.yml
+++ b/.github/workflows/push_gem.yml
@@ -17,12 +17,16 @@ jobs:
 
     steps:
       # Set up
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
       - name: Set up Ruby
-        uses: ruby/setup-ruby@v1
+        uses: ruby/setup-ruby@14594264cd68ce8a2345dd349bc3d138a4ef85c8 # v1.327.0
         with:
-          bundler-cache: true
           ruby-version: ruby
+      # Not bundler-cache: a tag-triggered release shouldn't restore a cache other workflows can write.
+      - name: Install gems
+        run: bundle install
 
       # Release
-      - uses: rubygems/release-gem@v1
+      - uses: rubygems/release-gem@7f9650160c1a4e7989fdc9855807bdbd421d8b6b # v1.4.1
diff --git a/.github/workflows/zizmor.yml b/.github/workflows/zizmor.yml
new file mode 100644
index 0000000..e5a0721
--- /dev/null
+++ b/.github/workflows/zizmor.yml
@@ -0,0 +1,16 @@
+name: GitHub Actions Security Analysis
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: ["**"]
+
+permissions: {}
+
+jobs:
+  zizmor:
+    permissions:
+      contents: read
+      security-events: write
+    uses: rubyatscale/shared-config/.github/workflows/zizmor.yml@main # zizmor: ignore[unpinned-uses] internal reusable workflow tracked at @main by convention so shared-config updates propagate automatically