diff --git a/.github/workflows/docs.yaml b/.github/workflows/docs.yaml
index 77feaf0..19df691 100644
--- a/.github/workflows/docs.yaml
+++ b/.github/workflows/docs.yaml
@@ -16,6 +16,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
       - uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
         with:
           python-version: 3.x
@@ -36,6 +38,8 @@ jobs:
     steps:
       - uses: actions/configure-pages@45bfe0192ca1faeb007ade9deae92b16b8254a0d # v6.0.0
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
       - uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
         with:
           python-version: 3.x
diff --git a/.github/workflows/lint-frontend.yaml b/.github/workflows/lint-frontend.yaml
index b15bd9b..ff88b0b 100644
--- a/.github/workflows/lint-frontend.yaml
+++ b/.github/workflows/lint-frontend.yaml
@@ -5,6 +5,9 @@ on:
       - main
   pull_request:
 
+permissions:
+  contents: read
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
@@ -18,6 +21,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
       - uses: pnpm/action-setup@0ebf47130e4866e96fce0953f49152a61190b271 # v6.0.9
       - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
         with:
@@ -31,6 +36,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
       - uses: pnpm/action-setup@0ebf47130e4866e96fce0953f49152a61190b271 # v6.0.9
       - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
         with:
@@ -44,6 +51,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
       - uses: pnpm/action-setup@0ebf47130e4866e96fce0953f49152a61190b271 # v6.0.9
       - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
         with:
diff --git a/.github/workflows/lint-rust.yaml b/.github/workflows/lint-rust.yaml
index 6566acb..b62ab18 100644
--- a/.github/workflows/lint-rust.yaml
+++ b/.github/workflows/lint-rust.yaml
@@ -5,6 +5,9 @@ on:
       - main
   pull_request:
 
+permissions:
+  contents: read
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
@@ -18,6 +21,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
       - name: Install system dependencies
         run: sudo apt-get update && sudo apt-get install -y libwebkit2gtk-4.1-dev libappindicator3-dev librsvg2-dev patchelf
       - name: Install Rust toolchain
@@ -30,6 +35,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
       - name: Install Rust toolchain
         run: rustup toolchain install --no-self-update
       - run: cargo fmt --all -- --check
@@ -39,6 +46,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
       - name: Install system dependencies
         run: sudo apt-get update && sudo apt-get install -y libwebkit2gtk-4.1-dev libappindicator3-dev librsvg2-dev patchelf
       - name: Install Rust toolchain
@@ -51,6 +60,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
       - name: Install system dependencies
         run: sudo apt-get update && sudo apt-get install -y libwebkit2gtk-4.1-dev libappindicator3-dev librsvg2-dev patchelf
       - name: Install Rust toolchain
@@ -63,6 +74,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
       - name: Install system dependencies
         run: sudo apt-get update && sudo apt-get install -y libwebkit2gtk-4.1-dev libappindicator3-dev librsvg2-dev patchelf
       - name: Install Rust toolchain
@@ -85,6 +98,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
       - uses: crate-ci/typos@bee27e3a4fd1ea2111cf90ab89cd076c870fce14 # v1.48.0
 
   collect-lint-rust:
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index a7cf5a3..7230d14 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -34,6 +34,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
 
       - name: Install system dependencies (Linux only)
         if: matrix.platform == 'ubuntu-22.04'
diff --git a/.github/workflows/update-homebrew.yaml b/.github/workflows/update-homebrew.yaml
index c46c4e4..3e4ec82 100644
--- a/.github/workflows/update-homebrew.yaml
+++ b/.github/workflows/update-homebrew.yaml
@@ -9,17 +9,24 @@ on:
         description: "Release tag (e.g., v0.0.1)"
         required: true
 
+permissions:
+  contents: read
+
 jobs:
   update-cask:
     runs-on: macos-latest
     steps:
       - name: Determine tag
         id: tag
+        env:
+          EVENT_NAME: ${{ github.event_name }}
+          INPUT_TAG: ${{ inputs.tag }}
+          REF_NAME: ${{ github.ref_name }}
         run: |
-          if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
-            echo "tag=${{ inputs.tag }}" >> "$GITHUB_OUTPUT"
+          if [ "$EVENT_NAME" = "workflow_dispatch" ]; then
+            printf 'tag=%s\n' "$INPUT_TAG" >> "$GITHUB_OUTPUT"
           else
-            echo "tag=${{ github.ref_name }}" >> "$GITHUB_OUTPUT"
+            printf 'tag=%s\n' "$REF_NAME" >> "$GITHUB_OUTPUT"
           fi
 
       - name: Extract version from tag
@@ -31,9 +38,11 @@ jobs:
       - name: Download macOS DMGs
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          REPOSITORY: ${{ github.repository }}
+          TAG: ${{ steps.tag.outputs.tag }}
         run: |
-          gh release download "${{ steps.tag.outputs.tag }}" \
-            --repo "${{ github.repository }}" \
+          gh release download "$TAG" \
+            --repo "$REPOSITORY" \
             --pattern '*_aarch64.dmg' \
             --pattern '*_x64.dmg'
 
@@ -48,6 +57,7 @@ jobs:
         with:
           repository: shunichironomura/homebrew-tap
           token: ${{ secrets.HOMEBREW_TAP_TOKEN }}
+          persist-credentials: false
 
       - name: Update cask formula
         env:
@@ -95,6 +105,9 @@ jobs:
           '
 
       - name: Commit and push
+        env:
+          GH_TOKEN: ${{ secrets.HOMEBREW_TAP_TOKEN }}
+          VERSION: ${{ steps.version.outputs.version }}
         run: |
           git config user.name "github-actions[bot]"
           git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
@@ -102,6 +115,7 @@ jobs:
           if git diff --cached --quiet; then
             echo "No changes to commit"
           else
-            git commit -m "Update procnote to ${{ steps.version.outputs.version }}"
+            git commit -m "Update procnote to $VERSION"
+            gh auth setup-git --hostname github.com --force
             git push
           fi