diff --git a/docker/main/Dockerfile b/docker/main/Dockerfile
index 3f2ebfc59..0116e8733 100644
--- a/docker/main/Dockerfile
+++ b/docker/main/Dockerfile
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.4
+# syntax=docker/dockerfile:1.6
 
 # https://askubuntu.com/questions/972516/debian-frontend-environment-variable
 ARG DEBIAN_FRONTEND=noninteractive