diff --git a/docker/linux-image.sh b/docker/linux-image.sh
index 449573e02..77cbb165d 100755
--- a/docker/linux-image.sh
+++ b/docker/linux-image.sh
@@ -90,6 +90,7 @@ main() {
     local dependencies=(
         cpio
         sharutils
+	gnupg
     )
 
     local purge_list=()