diff --git a/backend/Dockerfile b/backend/Dockerfile
index 0a2693f..eb8b7c9 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.8
+# syntax=docker/dockerfile:1.9
 FROM cgr.dev/chainguard/go:latest as build
 
 WORKDIR /src