diff --git a/README.md b/README.md
index f4a0711..30086df 100644
--- a/README.md
+++ b/README.md
@@ -74,7 +74,7 @@ For example, it may be used to increase the PHP memory limit (`memory_limit=128M
 ## Building a Docker image
 
 Use the `Dockerfile` in this repository to build your own Docker image.
-It pulls the latest build of Roundcube Webmail from the Github download page and builds it on top of a `php:7.1-apache` Docker image.
+It pulls the latest build of Roundcube Webmail from the Github download page and builds it on top of a `php:7.2-apache` Docker image.
 
 Build it from this directory with
 
diff --git a/php-apache/Dockerfile b/php-apache/Dockerfile
index 7c97db3..f199ce9 100644
--- a/php-apache/Dockerfile
+++ b/php-apache/Dockerfile
@@ -1,4 +1,4 @@
-FROM php:7.1-apache
+FROM php:7.2-apache
 LABEL maintainer="Thomas Bruederli <thomas@roundcube.net>"
 
 RUN set -ex; \
diff --git a/php-fpm/Dockerfile b/php-fpm/Dockerfile
index ab73e38..12233e7 100644
--- a/php-fpm/Dockerfile
+++ b/php-fpm/Dockerfile
@@ -1,4 +1,4 @@
-FROM php:7.1-fpm
+FROM php:7.2-fpm
 LABEL maintainer="Thomas Bruederli <thomas@roundcube.net>"
 
 RUN set -ex; \