diff --git a/Dockerfile b/Dockerfile
index 1adfe62..a6fd271 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,6 +3,9 @@ FROM python:3.6-alpine
 RUN mkdir /code
 WORKDIR /code
 
-RUN pip install black
+RUN apk add --no-cache --virtual .build-deps gcc musl-dev \
+ && pip install --upgrade pip \
+ && pip install black \
+ && apk del .build-deps
 
 ENTRYPOINT ["black"]