diff --git a/installers/brew.sh b/installers/brew.sh
index 0cf80f9..df843d2 100755
--- a/installers/brew.sh
+++ b/installers/brew.sh
@@ -1,3 +1,5 @@
+#!/bin/zsh
+
 if ! type "brew" > /dev/null; then
 	echo '`brew` not found. Install Homebrew'
 	/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
diff --git a/installers/dein.sh b/installers/dein.sh
index 9ad9607..a0bfd64 100755
--- a/installers/dein.sh
+++ b/installers/dein.sh
@@ -1,3 +1,5 @@
+#!/bin/zsh
+
 # Install dein
 INSTALLATION_DIR=$HOME/.cache/dein
 
diff --git a/installers/xcode.sh b/installers/xcode.sh
index 6939170..882ffe6 100755
--- a/installers/xcode.sh
+++ b/installers/xcode.sh
@@ -1,3 +1,5 @@
+#!/bin/zsh
+
 if ! type "xcodebuild" > /dev/null ; then
 	xcodes install --latest
 fi
diff --git a/installers/zplug.sh b/installers/zplug.sh
index 3918fa4..fab92b9 100755
--- a/installers/zplug.sh
+++ b/installers/zplug.sh
@@ -1,3 +1,5 @@
+#!/bin/zsh
+
 if [ ! -d $ZPLUG_HOME ]; then
     curl -sL --proto-redir -all,https https://raw.githubusercontent.com/zplug/installer/master/installer.zsh | zsh
 fi
diff --git a/settings/macos/install.sh b/settings/macos/install.sh
index 462d99c..ae45c02 100755
--- a/settings/macos/install.sh
+++ b/settings/macos/install.sh
@@ -1,3 +1,5 @@
+#!/bin/zsh
+
 # NSGlobalDomain
 # 全ての拡張子のファイルを表示
 defaults write NSGlobalDomain AppleShowAllExtensions -bool true
diff --git a/settings/vscode/install-extensions.sh b/settings/vscode/install-extensions.sh
index 7acb978..9602af7 100755
--- a/settings/vscode/install-extensions.sh
+++ b/settings/vscode/install-extensions.sh
@@ -1,3 +1,5 @@
+#!/bin/zsh
+
 if ! type 'code' > /dev/null; then
     echo 'Please install vscode and activate `code` command.'
     exit 1
diff --git a/settings/vscode/install.sh b/settings/vscode/install.sh
index 5a8472e..6b8d6b4 100755
--- a/settings/vscode/install.sh
+++ b/settings/vscode/install.sh
@@ -1,3 +1,5 @@
+#!/bin/zsh
+
 SCRIPT_DIR=$(cd $(dirname $0) && pwd)
 VSCODE_DOT_DIRECTORY=$HOME/.vscode
 VSCODE_SETTING_DIR=$HOME/Library/Application\ Support/Code/User
diff --git a/settings/xcode/install.sh b/settings/xcode/install.sh
index 6939170..882ffe6 100644
--- a/settings/xcode/install.sh
+++ b/settings/xcode/install.sh
@@ -1,3 +1,5 @@
+#!/bin/zsh
+
 if ! type "xcodebuild" > /dev/null ; then
 	xcodes install --latest
 fi