diff --git a/1.6/Dockerfile b/1.6/Dockerfile
index 680561e..bcf91d7 100644
--- a/1.6/Dockerfile
+++ b/1.6/Dockerfile
@@ -1,4 +1,4 @@
-FROM php:7.3.23-fpm-buster@sha256:0e295b568b980e9d723c8b967629afbfbbb328365d7642a846f2f6447bc08674
+FROM php:7.4.11-fpm-buster@sha256:0b5c9ca0ca845b74eaab74fc6bde3088b42c92f671f15c2cf07e197f32f95d84
 
 # renovate: datasource=github-tags depName=getgrav/grav versioning=semver
 ENV GRAV_VERSION 1.6.28
diff --git a/1.7/Dockerfile b/1.7/Dockerfile
index 859964b..70b95d7 100644
--- a/1.7/Dockerfile
+++ b/1.7/Dockerfile
@@ -1,4 +1,4 @@
-FROM php:7.3.23-fpm-buster@sha256:0e295b568b980e9d723c8b967629afbfbbb328365d7642a846f2f6447bc08674
+FROM php:7.4.11-fpm-buster@sha256:0b5c9ca0ca845b74eaab74fc6bde3088b42c92f671f15c2cf07e197f32f95d84
 
 # renovate: datasource=github-tags depName=getgrav/grav versioning=semver
 ENV GRAV_VERSION 1.7.0-rc.17