diff --git a/Dockerfile b/Dockerfile
index 6b0ae06..0a87e9a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,7 @@ FROM alpine
 MAINTAINER Christoph Wiechert <wio@psitrax.de>
 
 ENV REFRESHED_AT="2017-05-17" \
-    POWERDNS_VERSION=4.0.3 \
+    POWERDNS_VERSION=4.0.4 \
     MYSQL_AUTOCONF=true \
     MYSQL_HOST="mysql" \
     MYSQL_PORT="3306" \