diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 5ace4600..6cc00712 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -4,3 +4,5 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly"
+    cooldown:
+      default-days: 7
diff --git a/.github/workflows/check-style-strict.yml b/.github/workflows/check-style-strict.yml
index 3279fedf..bce23c77 100644
--- a/.github/workflows/check-style-strict.yml
+++ b/.github/workflows/check-style-strict.yml
@@ -7,8 +7,8 @@ jobs:
     runs-on: 'ubuntu-latest'
 
     steps:
-    - uses: actions/checkout@v6
-    - uses: actions/setup-python@v6
+    - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+    - uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
       with:
         python-version: '3.12'
         cache: 'pip'
diff --git a/.github/workflows/ets-from-source.yml b/.github/workflows/ets-from-source.yml
index c7a98b40..7dce82e1 100644
--- a/.github/workflows/ets-from-source.yml
+++ b/.github/workflows/ets-from-source.yml
@@ -21,9 +21,9 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout the target commit
-        uses: actions/checkout@v6
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
       - name: Set up bootstrap Python (3.10)
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
         with:
           python-version: '3.10'
           cache: 'pip'
@@ -31,12 +31,12 @@ jobs:
       - name: Install necessary packages to the bootstrap environment
         run: python -m pip install -r .github/workflows/bootstrap-requirements.txt
       - name: Cache EDM packages
-        uses: actions/cache@v6
+        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
           path: ~/.cache
           key: ${{ runner.os }}-${{ matrix.runtime }}-${{ hashFiles('etstool.py') }}
       - name: Setup EDM
-        uses: enthought/setup-edm-action@v4.2
+        uses: enthought/setup-edm-action@e68a4e0282298d695020fb21b4d3e93c3ac3c11f # v4.2
         with:
           edm-version: ${{ env.INSTALL_EDM_VERSION }}
       - name: Install test environment
diff --git a/.github/workflows/publish-on-pypi.yml b/.github/workflows/publish-on-pypi.yml
index a21511cb..ee641ad0 100644
--- a/.github/workflows/publish-on-pypi.yml
+++ b/.github/workflows/publish-on-pypi.yml
@@ -11,9 +11,9 @@ jobs:
 
     steps:
     - name: Check out the release commit
-      uses: actions/checkout@v6
+      uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
     - name: Set up Python
-      uses: actions/setup-python@v6
+      uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
       with:
         python-version: '3.10'
     - name: Install Python packages needed for build and upload
diff --git a/.github/workflows/test-minimal-dependencies.yml b/.github/workflows/test-minimal-dependencies.yml
index 302d1ab9..430bc5c2 100644
--- a/.github/workflows/test-minimal-dependencies.yml
+++ b/.github/workflows/test-minimal-dependencies.yml
@@ -15,9 +15,9 @@ jobs:
 
     steps:
     - name: Get apptools source
-      uses: actions/checkout@v6
+      uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v6
+      uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install local package
diff --git a/.github/workflows/test-with-edm.yml b/.github/workflows/test-with-edm.yml
index 0e6d0287..b3e61465 100644
--- a/.github/workflows/test-with-edm.yml
+++ b/.github/workflows/test-with-edm.yml
@@ -21,9 +21,9 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout the target commit
-        uses: actions/checkout@v6
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
       - name: Set up bootstrap Python (3.10)
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
         with:
           python-version: '3.12'
           cache: 'pip'
@@ -31,12 +31,12 @@ jobs:
       - name: Install necessary packages to the bootstrap environment
         run: python -m pip install -r .github/workflows/bootstrap-requirements.txt
       - name: Cache EDM packages
-        uses: actions/cache@v6
+        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
           path: ~/.cache
           key: ${{ runner.os }}-${{ matrix.runtime }}-${{ hashFiles('etstool.py') }}
       - name: Setup EDM
-        uses: enthought/setup-edm-action@v4.2
+        uses: enthought/setup-edm-action@e68a4e0282298d695020fb21b4d3e93c3ac3c11f # v4.2
         with:
           edm-version: ${{ env.INSTALL_EDM_VERSION }}
       - name: Install test environment
diff --git a/.github/workflows/test-with-pip.yml b/.github/workflows/test-with-pip.yml
index 02f4509b..f8ed9931 100644
--- a/.github/workflows/test-with-pip.yml
+++ b/.github/workflows/test-with-pip.yml
@@ -15,9 +15,9 @@ jobs:
 
     steps:
     - name: Get apptools source
-      uses: actions/checkout@v6
+      uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v6
+      uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies and local packages