diff --git a/Brewfile b/Brewfile
index 8d4cb99..2638c4e 100644
--- a/Brewfile
+++ b/Brewfile
@@ -9,4 +9,6 @@ brew "trash"
 # brew "swiftlint"
 
 tap "peripheryapp/periphery"
-cask "periphery"
+if OS.mac? && MacOS.version >= :ventura
+  cask "periphery"
+end
diff --git a/script/bootstrap b/script/bootstrap
index fcfc38d..7448a03 100755
--- a/script/bootstrap
+++ b/script/bootstrap
@@ -13,22 +13,15 @@ if ! cd -- "${mas_dir}"; then
   exit 1
 fi
 
-main() {
-  script/clean
+script/clean
 
-  printf $'==> 👢 Bootstrapping\n'
+printf $'==> 👢 Bootstrapping (%s)\n' "$(script/version)"
 
-  # Install Homebrew tools
-  rm -f Brewfile.lock.json
-  brew bundle install --no-upgrade --verbose
+# Install Homebrew tools
+rm -f Brewfile.lock.json
+brew bundle install --no-upgrade --verbose
 
-  # Already installed on GitHub Actions runner.
-  if [[ ! -x "$(command -v swiftlint)" ]]; then
-    brew install swiftlint
-  fi
-
-  # Generate Package.swift
-  script/version
-}
-
-main
+# swiftlint is already installed on GitHub Actions runners.
+if [[ ! -x "$(command -v swiftlint)" ]]; then
+  brew install swiftlint
+fi