diff --git a/ubuntu_mates.sh b/ubuntu_mates.sh
index b508f7a..c986ff6 100644
--- a/ubuntu_mates.sh
+++ b/ubuntu_mates.sh
@@ -5,6 +5,7 @@ sudo sed -i 's/kr.archive.ubuntu.com/mirror.kakao.com/g' /etc/apt/sources.list
 sudo sed -i 's/archive.ubuntu.com/mirror.kakao.com/g' /etc/apt/sources.list
 
 # essential packages
+sudo apt update
 sudo apt install -y nnn zsh ncdu htop rsync git vim
 
 # Installation of om my zsh