diff --git a/appimage/build_appimage.sh b/appimage/build_appimage.sh
index fe3e89e0b..114aa1c66 100755
--- a/appimage/build_appimage.sh
+++ b/appimage/build_appimage.sh
@@ -46,7 +46,7 @@ install_nodejs() {
 
 install_build_prereqs() {
     sudo apt update
-    sudo apt upgrade
+    sudo apt upgrade -y
 
     # monkey island prereqs
     sudo apt install -y curl libcurl4 openssl git build-essential moreutils