diff --git a/.github/workflows/antivirus.yml b/.github/workflows/antivirus.yml
new file mode 100644
index 00000000..d62257da
--- /dev/null
+++ b/.github/workflows/antivirus.yml
@@ -0,0 +1,19 @@
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+permissions:
+  contents: read
+
+jobs:
+  gitavscan:
+    runs-on: ubuntu-latest
+    name: AV scan
+    steps:
+    - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      with:
+        persist-credentials: false
+    - name: Git AV Scan
+      uses: djdefi/gitavscan@66a83ba98eca422f37322bc9851fa56195b252f3 # v23
+      with:
+        full: '--full'
diff --git a/.github/workflows/deploy-book.yml b/.github/workflows/deploy-book.yml
index 2654c94e..4f090c5b 100644
--- a/.github/workflows/deploy-book.yml
+++ b/.github/workflows/deploy-book.yml
@@ -17,13 +17,15 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.10.21]
+        python-version: [3.13]
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      with:
+        persist-credentials: false
 
     # Install dependencies
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@6d4fd22b20465ccc0f7354476588e8df7c9ca0e0 # v7.1.0
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
@@ -35,7 +37,7 @@ jobs:
         jupyter-book build .
     # Deploy the book's HTML to gh-pages branch
     - name: GitHub Pages action
-      uses: peaceiris/actions-gh-pages@v3.9.3
+      uses: peaceiris/actions-gh-pages@84c30a85c19949d7eee79c4ff27748b70285e453 # v4.1.0
       if: github.ref == 'refs/heads/main'
       with:
         github_token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/security-analysis.yml b/.github/workflows/security-analysis.yml
deleted file mode 100644
index 59dc5d8e..00000000
--- a/.github/workflows/security-analysis.yml
+++ /dev/null
@@ -1,61 +0,0 @@
-name: "CodeQL"
-
-on:
-  push:
-    branches:
-      - main
-  pull_request:
-    # The branches below must be a subset of the branches above
-    branches:
-      - main
-  schedule:
-    - cron: '42 7 * * 5'
-
-jobs:
-  analyze:
-    name: Analyze
-    runs-on: ubuntu-latest
-    permissions:
-      actions: read
-      contents: read
-      security-events: write
-
-    strategy:
-      fail-fast: false
-      matrix:
-        language: [ 'python' ]
-        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python', 'ruby' ]
-        # Learn more about CodeQL language support at https://git.io/codeql-language-support
-
-    steps:
-    - name: Checkout repository
-      uses: actions/checkout@v2
-
-    # Initializes the CodeQL tools for scanning.
-    - name: Initialize CodeQL
-      uses: github/codeql-action/init@v1
-      with:
-        languages: ${{ matrix.language }}
-        # If you wish to specify custom queries, you can do so here or in a config file.
-        # By default, queries listed here will override any specified in a config file.
-        # Prefix the list here with "+" to use these queries and those in the config file.
-        # queries: ./path/to/local/query, your-org/your-repo/queries@main
-
-    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
-    # If this step fails, then you should remove it and run the build manually (see below)
-    - name: Autobuild
-      uses: github/codeql-action/autobuild@v1
-
-    # ℹ️ Command-line programs to run using the OS shell.
-    # 📚 https://git.io/JvXDl
-
-    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
-    #    and modify them (or add more) to build your code if your project
-    #    uses a compiled language
-
-    #- run: |
-    #   make bootstrap
-    #   make release
-
-    - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v1
diff --git a/.github/workflows/virus.yml b/.github/workflows/virus.yml
deleted file mode 100644
index 95e5f691..00000000
--- a/.github/workflows/virus.yml
+++ /dev/null
@@ -1,12 +0,0 @@
-on:
-  pull_request:
-    types: [assigned, opened, synchronize, reopened, closed]
-
-jobs:
-  gitavscan:
-    runs-on: ubuntu-latest
-    name: AV scan
-    steps:
-    - uses: actions/checkout@v2
-    - name: Git AV Scan
-      uses: djdefi/gitavscan@main