diff --git a/7/apache/Dockerfile b/7/apache/Dockerfile
index 9e1351edd..8731f8c31 100644
--- a/7/apache/Dockerfile
+++ b/7/apache/Dockerfile
@@ -1,5 +1,5 @@
 # from https://www.drupal.org/docs/8/system-requirements/drupal-8-php-requirements
-FROM php:7.2-apache-stretch
+FROM php:7.3-apache-stretch
 # TODO switch to buster once https://github.com/docker-library/php/issues/865 is resolved in a clean way (either in the PHP image or in PHP itself)
 
 # install the PHP extensions we need
diff --git a/7/fpm-alpine/Dockerfile b/7/fpm-alpine/Dockerfile
index e75a36442..c2bc6df2f 100644
--- a/7/fpm-alpine/Dockerfile
+++ b/7/fpm-alpine/Dockerfile
@@ -1,5 +1,5 @@
 # from https://www.drupal.org/docs/8/system-requirements/drupal-8-php-requirements
-FROM php:7.2-fpm-alpine
+FROM php:7.3-fpm-alpine
 
 # install the PHP extensions we need
 # postgresql-dev is needed for https://bugs.alpinelinux.org/issues/3642
diff --git a/7/fpm/Dockerfile b/7/fpm/Dockerfile
index 877c25af3..13c8eed06 100644
--- a/7/fpm/Dockerfile
+++ b/7/fpm/Dockerfile
@@ -1,5 +1,5 @@
 # from https://www.drupal.org/docs/8/system-requirements/drupal-8-php-requirements
-FROM php:7.2-fpm-stretch
+FROM php:7.3-fpm-stretch
 # TODO switch to buster once https://github.com/docker-library/php/issues/865 is resolved in a clean way (either in the PHP image or in PHP itself)
 
 # install the PHP extensions we need
diff --git a/update.sh b/update.sh
index bf0a8f620..4058b84f8 100755
--- a/update.sh
+++ b/update.sh
@@ -9,9 +9,11 @@ if [ ${#versions[@]} -eq 0 ]; then
 fi
 versions=( "${versions[@]%/}" )
 
+# https://www.drupal.org/docs/8/system-requirements/php-requirements#php_required
 defaultPhpVersion='7.3'
 declare -A phpVersions=(
-	[7]='7.2'
+	# https://www.drupal.org/docs/7/system-requirements/php-requirements#php_required
+	#[7]='7.2'
 )
 
 travisEnv=