diff --git a/homebridge/Dockerfile b/homebridge/Dockerfile
index 5ea5fc4..9e3fec5 100644
--- a/homebridge/Dockerfile
+++ b/homebridge/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine
+FROM alpine:3.18
 
 RUN apk add --no-cache --virtual .build-deps make gcc g++ python3 \
     && apk add --no-cache nodejs npm openssl avahi-compat-libdns_sd avahi-dev dbus
diff --git a/mosquitto/Dockerfile b/mosquitto/Dockerfile
index 8c42a59..a840442 100644
--- a/mosquitto/Dockerfile
+++ b/mosquitto/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine
+FROM alpine:3.18
 
 RUN apk add --no-cache mosquitto mosquitto-clients tzdata
 
diff --git a/nodered/Dockerfile b/nodered/Dockerfile
index 2b06bdd..2c1876d 100644
--- a/nodered/Dockerfile
+++ b/nodered/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine
+FROM alpine:3.18
 
 RUN apk add --no-cache --virtual .build-deps make gcc g++ python3 krb5-dev zeromq-dev \
     && apk add --no-cache nodejs npm openssl