diff --git a/Dockerfile b/Dockerfile
index 52a14c1..f1019de 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.14
+FROM alpine:3.15
 RUN \
   apk -U upgrade && apk add mosquitto mosquitto-clients openssl && \
   echo "log_dest stdout" >/etc/mosquitto/mosquitto.conf && \