diff --git a/start.sh b/start.sh
index b2c52ec..d339f02 100644
--- a/start.sh
+++ b/start.sh
@@ -13,19 +13,19 @@ NC='\033[0m' # No Color
 
 # ログ関数
 log_info() {
-    echo -e "${GREEN}[INFO]${NC} $1"
+    printf "${GREEN}[INFO]${NC} %s\n" "$1"
 }
 
 log_warn() {
-    echo -e "${YELLOW}[WARN]${NC} $1"
+    printf "${YELLOW}[WARN]${NC} %s\n" "$1"
 }
 
 log_error() {
-    echo -e "${RED}[ERROR]${NC} $1"
+    printf "${RED}[ERROR]${NC} %s\n" "$1"
 }
 
 log_blue() {
-    echo -e "${BLUE}[INFO]${NC} $1"
+    printf "${BLUE}[INFO]${NC} %s\n" "$1"
 }
 
 # ヘルプメッセージ
@@ -132,7 +132,7 @@ start_container() {
     fi
     
     # 環境変数を読み込み
-    source .env
+    . ./.env
     
     # 必須変数の確認
     if [ -z "$EMAIL_USER" ] || [ -z "$EMAIL_PASSWORD" ] || [ -z "$DISCORD_WEBHOOK_URL" ]; then
@@ -268,7 +268,7 @@ run_python() {
     
     # 環境変数を読み込んで実行
     log_info "アプリケーションを起動しています..."
-    export $(cat .env | xargs)
+    . ./.env
     python3 app.py
 }