diff --git a/data/Dockerfiles/dockerapi/Dockerfile b/data/Dockerfiles/dockerapi/Dockerfile
index 30fb0d39..67bb6b07 100644
--- a/data/Dockerfiles/dockerapi/Dockerfile
+++ b/data/Dockerfiles/dockerapi/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.8
+FROM alpine:3.9
 LABEL maintainer "Andre Peters <andre.peters@servercow.de>"
 
 RUN apk add -U --no-cache python2 python-dev py-pip gcc musl-dev tzdata openssl-dev libffi-dev \
diff --git a/data/Dockerfiles/netfilter/Dockerfile b/data/Dockerfiles/netfilter/Dockerfile
index aab9b1d3..92eaa39f 100644
--- a/data/Dockerfiles/netfilter/Dockerfile
+++ b/data/Dockerfiles/netfilter/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.8
+FROM alpine:3.9
 LABEL maintainer "Andre Peters <andre.peters@servercow.de>"
 
 ENV XTABLES_LIBDIR /usr/lib/xtables
diff --git a/data/Dockerfiles/unbound/Dockerfile b/data/Dockerfiles/unbound/Dockerfile
index 8e056a93..9fb46168 100644
--- a/data/Dockerfiles/unbound/Dockerfile
+++ b/data/Dockerfiles/unbound/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.8
+FROM alpine:3.9
 
 LABEL maintainer "Andre Peters <andre.peters@servercow.de>"
 
diff --git a/data/Dockerfiles/watchdog/Dockerfile b/data/Dockerfiles/watchdog/Dockerfile
index c4427c59..7ab29b68 100644
--- a/data/Dockerfiles/watchdog/Dockerfile
+++ b/data/Dockerfiles/watchdog/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.8
+FROM alpine:3.9
 LABEL maintainer "André Peters <andre.peters@servercow.de>"
 
 # Installation