diff --git a/mix/Dockerfile b/mix/Dockerfile
index b684155..88a445c 100644
--- a/mix/Dockerfile
+++ b/mix/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.11
+FROM alpine:3.15
 LABEL maintainer="ProcessOne <contact@process-one.net>" \
       product="Ejabberd mix development environment"