diff --git a/prepare.sh b/prepare.sh
index 971c75f..bd7ec3d 100644
--- a/prepare.sh
+++ b/prepare.sh
@@ -14,6 +14,7 @@ detect_installs() {
         echo "$user ALL=NOPASSWD: /usr/bin/systemctl" > /etc/sudoers.d/octoprint_systemctl
         echo "$user ALL=NOPASSWD: /usr/sbin/reboot" > /etc/sudoers.d/octoprint_reboot
         INSTANCE=octoprint
+        apt-get update
         deb_packages
         #rename