diff --git a/Dockerfile b/Dockerfile
index 760278a..2c4f501 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,8 @@
-FROM alpine:3.21
+FROM alpine:3.22
 
 RUN \
-  apk -U upgrade && \
-  apk add mosquitto mosquitto-clients openssl && \
+  apk --no-cache upgrade && \
+  apk --no-cache add mosquitto mosquitto-clients openssl && \
   echo "log_dest stdout" >/etc/mosquitto/mosquitto.conf && \
   echo "listener 1883" >>/etc/mosquitto/mosquitto.conf && \
   echo "allow_anonymous true" >>/etc/mosquitto/mosquitto.conf