diff --git a/docker/blocks/graphite1/Dockerfile b/docker/blocks/graphite1/Dockerfile
index a3ab7c4f4af..be4f0573cad 100644
--- a/docker/blocks/graphite1/Dockerfile
+++ b/docker/blocks/graphite1/Dockerfile
@@ -1,5 +1,5 @@
 FROM phusion/baseimage:0.9.22
-MAINTAINER Denys Zhdanov <denis.zhdanov@gmail.com>
+LABEL maintainer="Denys Zhdanov <denis.zhdanov@gmail.com>"
 
 RUN apt-get -y update \
   && apt-get -y upgrade \
diff --git a/docker/blocks/openldap/Dockerfile b/docker/blocks/openldap/Dockerfile
index d16987cb3ab..d073e274356 100644
--- a/docker/blocks/openldap/Dockerfile
+++ b/docker/blocks/openldap/Dockerfile
@@ -1,6 +1,6 @@
 FROM debian:jessie
 
-MAINTAINER Christian Luginbühl <dinke@pimprecords.com>
+LABEL maintainer="Christian Luginbühl <dinke@pimprecords.com>"
 
 ENV OPENLDAP_VERSION 2.4.40
 
diff --git a/docker/blocks/smtp/Dockerfile b/docker/blocks/smtp/Dockerfile
index c1a3adba7c8..9326e077ed9 100644
--- a/docker/blocks/smtp/Dockerfile
+++ b/docker/blocks/smtp/Dockerfile
@@ -1,5 +1,5 @@
 FROM centos:centos7
-MAINTAINER Przemyslaw Ozgo <linux@ozgo.info>
+LABEL maintainer="Przemyslaw Ozgo <linux@ozgo.info>"
 
 RUN \
     yum update -y && \