diff --git a/dockerfile.cpu_only b/dockerfile.cpu_only
index fec8b7b..86f90b0 100644
--- a/dockerfile.cpu_only
+++ b/dockerfile.cpu_only
@@ -3,7 +3,7 @@ ARG PYTHON_VERSION=3.11
 ARG UBUNTU_VERSION=focal
 ARG POETRY_VERSION=1.6.1
 
-FROM python:$PYTHON_VERSION-slim as builder
+FROM python:$PYTHON_VERSION-slim AS builder
 ARG POETRY_VERSION
 
 ENV POETRY_HOME=/opt/poetry