diff --git a/Dockerfile b/Dockerfile
index 2e99416..1c3eb99 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3 AS builder
+FROM alpine:20231219 AS builder
 ARG MDNS_REPEATER_VERSION=local
 WORKDIR /
 COPY mdns-repeater.c mdns-repeater.c
@@ -7,7 +7,7 @@ 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:3@sha256:c5b1261d6d3e43071626931fc004f70149baeba2c8ec672bd4f27761f8e1ad6b
+FROM alpine:20231219@sha256:c5b1261d6d3e43071626931fc004f70149baeba2c8ec672bd4f27761f8e1ad6b
 # hadolint ignore=DL3018
 RUN set -ex && \
     apk add --no-cache vlan libcap bash