diff --git a/optional/radicale/Dockerfile b/optional/radicale/Dockerfile
index 6749606..dce888b 100644
--- a/optional/radicale/Dockerfile
+++ b/optional/radicale/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.7
+FROM alpine:edge
 
 RUN echo "@testing http://nl.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories \
  && apk add --no-cache radicale@testing py-dulwich@testing