diff --git a/3.New_server_deployment/4.APT_upgrade/0_setup.sh b/3.New_server_deployment/4.APT_upgrade/0_setup.sh
index d95b8317767117e9c8100103681c72309357ebca..da2d1c7bfdc7a05621cf74a6f656a0ddf044d012 100755
--- a/3.New_server_deployment/4.APT_upgrade/0_setup.sh
+++ b/3.New_server_deployment/4.APT_upgrade/0_setup.sh
@@ -5,7 +5,7 @@ DEBIAN_FRONTEND=noninteractive
 export DEBIAN_FRONTEND
 
 apt-get update
-apt-get install -y apt-transport-https
+apt-get install -y apt-transport-https gnupg
 
 # move 50unattended-upgrades conf if any
 if [ -f /etc/apt/apt.conf.d/50unattended-upgrades.ucf-dist ]; then