diff --git a/Dockerfile b/Dockerfile
index 907d3a5..3929bd6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -19,7 +19,7 @@ RUN apk update
 RUN apk upgrade --available
 
 # BUILDER: a container to build the service wheel
-FROM base as builder
+FROM base AS builder
 RUN pip install build
 COPY . /service
 WORKDIR /service