diff --git a/black/Dockerfile b/black/Dockerfile
index 5fcb246..705e4d0 100644
--- a/black/Dockerfile
+++ b/black/Dockerfile
@@ -4,7 +4,10 @@ LABEL io.whalebrew.name 'black'
 LABEL io.whalebrew.config.working_dir '/workdir'
 WORKDIR /workdir
 
-RUN pip install --upgrade black
+# we don't want gcc in the final image, so remove it in one docker layer
+RUN apk add --no-cache build-base \
+    && pip install --no-cache-dir --upgrade black \
+    && apk del build-base
 
 ENTRYPOINT ["black"]
 CMD ["--help"]
\ No newline at end of file