diff --git a/Dockerfile b/Dockerfile
index 18eccb6..4cbc460 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine AS builder
+FROM alpine:3 AS builder
 ARG MDNS_REPEATER_VERSION=local
 WORKDIR /
 COPY mdns-repeater.c mdns-repeater.c
@@ -6,7 +6,7 @@ RUN set -ex && \
     apk add --no-cache build-base && \
     gcc -o /bin/mdns-repeater mdns-repeater.c -DMDNS_REPEATER_VERSION=\"${MDNS_REPEATER_VERSION}\"
 
-FROM alpine
+FROM alpine:3
 
 RUN set -ex && \
     apk add --no-cache vlan libcap bash