diff --git a/roundcubemail/Dockerfile b/roundcubemail/Dockerfile
index dbbe2a3..5e22381 100644
--- a/roundcubemail/Dockerfile
+++ b/roundcubemail/Dockerfile
@@ -1,4 +1,4 @@
-FROM php:7.3-apache
+FROM php:7.4.14-apache-buster
 LABEL maintainer="Thomas Bruederli <thomas@roundcube.net>"
 
 RUN set -ex; \