diff --git a/Dockerfile b/Dockerfile
index 846d482..cadbcd9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,5 @@
-FROM python:3-alpine
+ARG REPO=library
+FROM ${REPO}/python:3-alpine
 
 RUN mkdir -p /src
 WORKDIR /src