diff --git a/Dockerfile b/Dockerfile
index 5946ae6..5178e6b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.8
+FROM alpine:3.9
 MAINTAINER Florian Schwab <me@ydkn.de>
 
 # update system