diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 510e1c1..c326eea 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -30,6 +30,7 @@ jobs:
         run: |
           git config --global core.autocrlf false
           git config --global core.eol lf
+
       - name: Set up Git repository
         uses: actions/checkout@main
 
@@ -39,6 +40,7 @@ jobs:
           sudo rm -rf /Applications/Xcode.app \
                       /Library/Developer/CommandLineTools
           sudo xcode-select --reset
+
       - name: Install WSL
         if: runner.os == 'windows'
         # https://github.com/Vampire/setup-wsl/releases/tag/v1.1.0
@@ -48,6 +50,12 @@ jobs:
           wsl-shell-user: runner
           additional-packages: build-essential
 
+      - name: Check Bash 3.x syntax
+        if: runner.os == 'macOS'
+        run: |
+          /bin/bash -u -n install.sh
+          /bin/bash -u -O extglob -n uninstall.sh
+
       - name: Set up Homebrew PATH
         if: runner.os != 'windows'
         run: |
@@ -57,6 +65,7 @@ jobs:
           else
             echo "/home/linuxbrew/.linuxbrew/bin:/usr/bin:/bin" >> "${GITHUB_PATH}"
           fi
+
       - name: Uninstall GitHub Actions Homebrew
         run: |
           if which brew &>/dev/null
@@ -64,6 +73,7 @@ jobs:
             /bin/bash uninstall.sh -n >/dev/null
             /bin/bash uninstall.sh -f >/dev/null
           fi
+
       - name: Set up WSL environment
         if: runner.os == 'windows'
         shell: "wsl-bash -u root {0}"
@@ -72,6 +82,7 @@ jobs:
           chmod 644 /etc/sudoers.d/runner
           echo -e "#!/bin/bash\nexec /home/linuxbrew/.linuxbrew/bin/brew \"\$@\"" | tee /usr/local/bin/brew
           chmod 755 /usr/local/bin/brew
+
       - run: /bin/bash -c "$(cat install.sh)"
 
       - run: brew config
@@ -88,11 +99,13 @@ jobs:
           export HOMEBREW_BREW_GIT_REMOTE="${HOMEBREW_BREW_DEFAULT_GIT_REMOTE/#https/git}"
           export HOMEBREW_CORE_GIT_REMOTE="${HOMEBREW_CORE_DEFAULT_GIT_REMOTE/#https/git}"
           /bin/bash -c "$(cat install.sh)"
+
       - run: brew config
 
       - run: |
           /bin/bash uninstall.sh -f >/dev/null
           unset HOMEBREW_{BREW,CORE}{,_DEFAULT}_GIT_REMOTE
+
       - run: /bin/bash -c "$(cat install.sh)"
 
       - name: Uninstall and reinstall with sudo NOPASSWD
@@ -101,11 +114,13 @@ jobs:
           echo "${USER} ALL=(ALL) NOPASSWD:ALL" | sudo tee "/etc/sudoers.d/${USER}"
           /bin/bash uninstall.sh -f >/dev/null
           /bin/bash -c "$(cat install.sh)"
+
       - name: Check code styles
         if: runner.os != 'windows'
         run: |
           brew install shellcheck shfmt diffutils
           brew style *.sh
+
       - run: /bin/bash uninstall.sh -n >/dev/null
 
       - run: /bin/bash uninstall.sh -f >/dev/null
diff --git a/bin/update.js b/bin/update.js
index 8124e3e..2c316a0 100644
--- a/bin/update.js
+++ b/bin/update.js
@@ -1,5 +1,5 @@
 #!/usr/bin/env node
-'use strict'
+'use strict';
 
 const path = require('path');
 const chalk = require('chalk');
@@ -10,7 +10,7 @@ const download = require('download-git-repo');
 const cwd = process.cwd();
 const origin = 'Homebrew/install';
 
-const branch = "#master";
+const branch = '#master';
 
 const targetPath = path.join(cwd, 'lib');
 
@@ -19,16 +19,27 @@ fsExtra.emptyDirSync(path.join(targetPath));
 const spinner = ora(`downloading ${origin}...`);
 spinner.start();
 
-download(`${origin}${branch}`, targetPath, {clone: false}, function (err) {
+download(`${origin}${branch}`, targetPath, { clone: false }, function(err) {
   spinner.stop();
   if (err) {
-    console.log(chalk.red(`Failed to download repo https://github.com/${origin}${branch}`, err));
+    console.log(
+      chalk.red(
+        `Failed to download repo https://github.com/${origin}${branch}`,
+        err,
+      ),
+    );
   } else {
-    console.log(chalk.green(`Success to download repo https://github.com/${origin}${branch}`));
+    console.log(
+      chalk.green(
+        `Success to download repo https://github.com/${origin}${branch}`,
+      ),
+    );
 
     try {
       fsExtra.removeSync(path.join(targetPath, '.github/ISSUE_TEMPLATE'));
-      fsExtra.removeSync(path.join(targetPath, '.github/workflows/triage-issues.yml'));
+      fsExtra.removeSync(
+        path.join(targetPath, '.github/workflows/triage-issues.yml'),
+      );
       fsExtra.removeSync(path.join(targetPath, '.github/ISSUE_TEMPLATE.md'));
 
       fsExtra.removeSync(path.join(targetPath, 'install'));
@@ -36,11 +47,15 @@ download(`${origin}${branch}`, targetPath, {clone: false}, function (err) {
       fsExtra.removeSync(path.join(targetPath, 'LICENSE.txt'));
       fsExtra.removeSync(path.join(targetPath, 'README.md'));
 
-      fsExtra.moveSync(path.join(targetPath, '.github'), path.join(cwd, '.github'), {overwrite: true});
+      fsExtra.moveSync(
+        path.join(targetPath, '.github/workflows/tests.yml'),
+        path.join(cwd, '.github/workflows/tests.yml'),
+        { overwrite: true },
+      );
 
       console.log(chalk.green('Done!'));
     } catch (e) {
       console.log(e.message);
     }
   }
-})
+});