diff --git a/Dockerfile b/Dockerfile
index 66d8a9f..d478b6b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 ARG ALPINE_VERSION=3.18.3
 ARG BASE_IMAGE=gitea.nulo.in/sutty/sutty
-FROM ${BASE_IMAGE}:${ALPINE_VERSION} as build
+FROM ${BASE_IMAGE}:${ALPINE_VERSION} AS build
 ARG RUBY_VERSION=2.7
 ARG RUBY_PATCH=5