diff --git a/Dockerfile b/Dockerfile
index 9811b75..f507dd0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,8 +10,8 @@ RUN \
 FROM alpine:latest
 
 RUN \
-  apk --update upgrade && \
-  apk add unbound bind-tools tini && \
+  apk --no-cache upgrade && \
+  apk --no-cache add unbound bind-tools tini && \
   wget -O /etc/unbound/named.cache ftp://ftp.internic.net//domain/named.cache
 
 COPY rootfs /