diff --git a/.github/workflows/integration-tests.yaml b/.github/workflows/integration-tests.yaml
index e2573e7..a11aa52 100644
--- a/.github/workflows/integration-tests.yaml
+++ b/.github/workflows/integration-tests.yaml
@@ -40,17 +40,17 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
+      uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       with:
         persist-credentials: false
 
     - name: Setup Python
-      uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
+      uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
       with:
         python-version: "3.12"
 
     - name: Cache pip dependencies
-      uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4
+      uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
       with:
         path: ~/.cache/pip
         key: ${{ runner.os }}-pip-integration-${{ hashFiles('requirements-dev.txt', 'requirements-test.txt') }}
@@ -64,12 +64,12 @@ jobs:
         pip install -r requirements-test.txt
 
     - name: Authenticate to Google Cloud
-      uses: google-github-actions/auth@c200f3691d83b41bf9bbd8638997a462592937ed # v2
+      uses: google-github-actions/auth@7c6bc770dae815cd3e89ee6cdf493a5fab2cc093 # v3
       with:
         credentials_json: ${{ secrets.GCP_SA_KEY }}
 
     - name: Set up Cloud SDK
-      uses: google-github-actions/setup-gcloud@e427ad8a34f8676edf47cf7d7925499adf3eb74f # v2
+      uses: google-github-actions/setup-gcloud@aa5489c8933f4cc7a4f7d45035b3b1440c9c10db # v3.0.1
 
     - name: Extract service account details
       env:
diff --git a/.github/workflows/lint-readme.yaml b/.github/workflows/lint-readme.yaml
index a585ec9..560f3ab 100644
--- a/.github/workflows/lint-readme.yaml
+++ b/.github/workflows/lint-readme.yaml
@@ -28,12 +28,12 @@ jobs:
 
     steps:
     - name: Setup Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
       with:
         python-version: "3.12"
 
     - name: Checkout code
-      uses: actions/checkout@v4
+      uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
     - name: Install dependencies
       run: pip install build twine
diff --git a/.github/workflows/pyink.yaml b/.github/workflows/pyink.yaml
index 1632aba..0a10411 100644
--- a/.github/workflows/pyink.yaml
+++ b/.github/workflows/pyink.yaml
@@ -18,6 +18,8 @@ on:
   pull_request:
     branches: [ main ]
 
+permissions:
+  contents: read
 
 jobs:
   pyink:
@@ -26,7 +28,7 @@ jobs:
 
     steps:
     - name: Setup Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
       with:
         python-version: "3.12"
 
@@ -34,7 +36,7 @@ jobs:
       run: pip install pyink
 
     - name: Checkout code
-      uses: actions/checkout@v4
+      uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
     - name: Run pyink check
       run: pyink . --check
\ No newline at end of file
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 00d5b09..abaa39f 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -18,6 +18,9 @@ on:
     branches: [ main ]
   workflow_dispatch:
 
+permissions:
+  contents: read
+
 jobs:
   test:
     name: Run unit tests
@@ -25,15 +28,15 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v4
+      uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
     - name: Setup Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
       with:
         python-version: "3.12"
 
     - name: Cache pip dependencies
-      uses: actions/cache@v4
+      uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
       with:
         path: ~/.cache/pip
         key: ${{ runner.os }}-pip-${{ hashFiles('requirements-dev.txt', 'requirements-test.txt') }}