diff --git a/Dockerfile-alpine b/Dockerfile-alpine
index 952738f..22b0806 100644
--- a/Dockerfile-alpine
+++ b/Dockerfile-alpine
@@ -1,6 +1,7 @@
 FROM alpine:3.10
 
-RUN apk -u add squid perl && \
+RUN apk -U upgrade && \
+    apk add squid perl && \
     mkdir -p /etc/squid/conf.d /etc/squid/patterns.d /etc/squid/storeid /app/storeid
 
 COPY docker-stuff/start.sh /app/