diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 00000000..05d92650
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,11 @@
+# Automated dependency updates.
+#
+# For configuration options see:
+# https://docs.github.com/en/github/administering-a-repository/configuration-options-for-dependency-updates
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 10
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c09a2e26..354b1303 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,6 +5,9 @@ on: [push, pull_request]
 env:
   CTEST_OUTPUT_ON_FAILURE: 1
 
+permissions:
+  contents: read
+
 jobs:
   ubuntu-ninja-clang:
     name: Ubuntu (ninja, clang)
@@ -14,7 +17,7 @@ jobs:
         run: |
           sudo apt update
           sudo apt install ninja-build
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633 # v4.1.2
       - name: Build and run tests
         env:
           CC: clang
@@ -26,7 +29,7 @@ jobs:
     name: Ubuntu (make, gcc)
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633 # v4.1.2
       - name: Build and run tests
         env:
           CC: gcc
@@ -42,7 +45,7 @@ jobs:
       - name: Prepare
         run: |
           brew install cmake ninja
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633 # v4.1.2
       - name: Build and run tests
         run: |
           scripts/test.sh
@@ -51,8 +54,8 @@ jobs:
     name: Windows
     runs-on: windows-2022
     steps:
-      - uses: microsoft/setup-msbuild@v2
-      - uses: actions/checkout@v4
+      - uses: microsoft/setup-msbuild@6fb02220983dee41ce7ae257b6f4d8f9bf5ed4ce # v2.0.0
+      - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633 # v4.1.2
       - name: Build and run tests
         run: |
           cmake .
diff --git a/.github/workflows/weekly.yml b/.github/workflows/weekly.yml
index a9c71cd3..c76e2041 100644
--- a/.github/workflows/weekly.yml
+++ b/.github/workflows/weekly.yml
@@ -8,6 +8,9 @@ on:
 env:
   CTEST_OUTPUT_ON_FAILURE: 1
 
+permissions:
+  contents: read
+
 jobs:
   clang:
     name: Clang ${{ matrix.clang-version }}
@@ -18,10 +21,10 @@ jobs:
         clang-version: [5, 7, 9, 11, 13, 15, 17]
     steps:
       - name: Setup Clang
-        uses: aminya/setup-cpp@v1
+        uses: aminya/setup-cpp@290824452986e378826155f3379d31bce8753d76 # v0.37.0
         with:
           llvm: ${{ matrix.clang-version }}
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633 # v4.1.2
       - name: Build and run tests
         run: |
           scripts/initbuild.sh make-concurrent
@@ -35,7 +38,7 @@ jobs:
         run: |
           sudo apt update
           sudo apt install gcc-multilib g++-multilib
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633 # v4.1.2
       - name: Build and run tests
         env:
           CC: clang
@@ -61,7 +64,7 @@ jobs:
           sudo dpkg -i ./cpp-4.4_4.4.7-8ubuntu1_amd64.deb
           sudo dpkg -i ./gcc-4.4_4.4.7-8ubuntu1_amd64.deb
           sudo dpkg -i ./libstdc++6-4.4-dev_4.4.7-8ubuntu1_amd64.deb ./g++-4.4_4.4.7-8ubuntu1_amd64.deb
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633 # v4.1.2
       - name: Build and run tests
         env:
           CC: gcc-4.4
@@ -79,10 +82,10 @@ jobs:
         gcc-version: [7, 9, 11, 13]
     steps:
       - name: Setup GCC
-        uses: aminya/setup-cpp@v1
+        uses: aminya/setup-cpp@290824452986e378826155f3379d31bce8753d76 # v0.37.0
         with:
           gcc: ${{ matrix.gcc-version }}
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633 # v4.1.2
       - name: Build and run tests
         run: |
           scripts/initbuild.sh make-concurrent
@@ -96,7 +99,7 @@ jobs:
         run: |
           sudo apt update
           sudo apt install gcc-multilib g++-multilib
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633 # v4.1.2
       - name: Build and run tests
         run: |
           scripts/initbuild.sh make-32bit
@@ -122,7 +125,7 @@ jobs:
         run: |
           source /opt/intel/oneapi/setvars.sh
           printenv >> $GITHUB_ENV
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633 # v4.1.2
       - name: Build and run tests
         env:
           CC: ${{ matrix.compiler }}
@@ -135,7 +138,7 @@ jobs:
     name: macOS Clang
     runs-on: macos-11
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633 # v4.1.2
       - name: Build and run tests
         run: |
           scripts/initbuild.sh make-concurrent
@@ -149,7 +152,7 @@ jobs:
       matrix:
         gcc-version: [9, 12]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633 # v4.1.2
       - name: Prepare
         run: |
           brew install gcc@${{ matrix.gcc-version }}
@@ -169,8 +172,8 @@ jobs:
       matrix:
         version: [2019, 2022]
     steps:
-      - uses: microsoft/setup-msbuild@v2
-      - uses: actions/checkout@v4
+      - uses: microsoft/setup-msbuild@6fb02220983dee41ce7ae257b6f4d8f9bf5ed4ce # v2.0.0
+      - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633 # v4.1.2
       - name: Build and run tests
         run: |
           cmake .
@@ -182,10 +185,10 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Setup cmake
-        uses: jwlawson/actions-setup-cmake@v2
+        uses: jwlawson/actions-setup-cmake@802fa1a2c4e212495c05bf94dba2704a92a472be # v2.0.2
         with:
           cmake-version: 2.8.12
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633 # v4.1.2
       - name: Build and run tests
         run: |
           cmake --version