diff --git a/15.0/apache/Dockerfile b/15.0/apache/Dockerfile
index 79aa5c62..57ae0a21 100644
--- a/15.0/apache/Dockerfile
+++ b/15.0/apache/Dockerfile
@@ -1,5 +1,5 @@
 # DO NOT EDIT: created by update.sh from Dockerfile-debian.template
-FROM php:7.2-apache-stretch
+FROM php:7.3-apache-stretch
 
 # entrypoint.sh and cron.sh dependencies
 RUN set -ex; \
@@ -34,6 +34,7 @@ RUN set -ex; \
         libpq-dev \
         libxml2-dev \
         libmagickwand-dev \
+        libzip-dev \
     ; \
     \
     debMultiarch="$(dpkg-architecture --query DEB_BUILD_MULTIARCH)"; \
diff --git a/15.0/fpm-alpine/Dockerfile b/15.0/fpm-alpine/Dockerfile
index 01de0270..70355541 100644
--- a/15.0/fpm-alpine/Dockerfile
+++ b/15.0/fpm-alpine/Dockerfile
@@ -1,5 +1,5 @@
 # DO NOT EDIT: created by update.sh from Dockerfile-alpine.template
-FROM php:7.2-fpm-alpine3.8
+FROM php:7.3-fpm-alpine3.8
 
 # entrypoint.sh and cron.sh dependencies
 RUN set -ex; \
@@ -25,6 +25,7 @@ RUN set -ex; \
         libpng-dev \
         libmemcached-dev \
         libxml2-dev \
+        libzip-dev \
         openldap-dev \
         pcre-dev \
         postgresql-dev \
diff --git a/15.0/fpm/Dockerfile b/15.0/fpm/Dockerfile
index 70e5ed22..ee5e7ac6 100644
--- a/15.0/fpm/Dockerfile
+++ b/15.0/fpm/Dockerfile
@@ -1,5 +1,5 @@
 # DO NOT EDIT: created by update.sh from Dockerfile-debian.template
-FROM php:7.2-fpm-stretch
+FROM php:7.3-fpm-stretch
 
 # entrypoint.sh and cron.sh dependencies
 RUN set -ex; \
@@ -34,6 +34,7 @@ RUN set -ex; \
         libpq-dev \
         libxml2-dev \
         libmagickwand-dev \
+        libzip-dev \
     ; \
     \
     debMultiarch="$(dpkg-architecture --query DEB_BUILD_MULTIARCH)"; \
diff --git a/Dockerfile-alpine.template b/Dockerfile-alpine.template
index 4d282f54..af584b5e 100644
--- a/Dockerfile-alpine.template
+++ b/Dockerfile-alpine.template
@@ -24,6 +24,7 @@ RUN set -ex; \
         libpng-dev \
         libmemcached-dev \
         libxml2-dev \
+        libzip-dev \
         openldap-dev \
         pcre-dev \
         postgresql-dev \
diff --git a/Dockerfile-debian.template b/Dockerfile-debian.template
index d10ae367..1b264823 100644
--- a/Dockerfile-debian.template
+++ b/Dockerfile-debian.template
@@ -33,6 +33,7 @@ RUN set -ex; \
         libpq-dev \
         libxml2-dev \
         libmagickwand-dev \
+        libzip-dev \
     ; \
     \
     debMultiarch="$(dpkg-architecture --query DEB_BUILD_MULTIARCH)"; \
diff --git a/update.sh b/update.sh
index 8a323635..26e54424 100755
--- a/update.sh
+++ b/update.sh
@@ -3,7 +3,7 @@ set -eo pipefail
 
 declare -A php_version=(
 	[default]='7.2'
-	[12.0]='7.1'
+	[15.0]='7.3'
 )
 
 declare -A cmd=(
@@ -58,6 +58,7 @@ travisEnv=
 
 function create_variant() {
 	dir="$1/$variant"
+	phpVersion=${php_version[$version]-${php_version[default]}}
 
 	# Create the version+variant directory with a Dockerfile.
 	mkdir -p "$dir"
@@ -70,7 +71,7 @@ function create_variant() {
 
 	# Replace the variables.
 	sed -ri -e '
-		s/%%PHP_VERSION%%/'"${php_version[$version]-${php_version[default]}}"'/g;
+		s/%%PHP_VERSION%%/'"$phpVersion"'/g;
 		s/%%VARIANT%%/'"$variant"'/g;
 		s/%%VERSION%%/'"$fullversion"'/g;
 		s/%%BASE_DOWNLOAD_URL%%/'"$2"'/g;
@@ -82,6 +83,12 @@ function create_variant() {
 		s/%%IMAGICK_VERSION%%/'"${pecl_versions[imagick]}"'/g;
 	' "$dir/Dockerfile"
 
+	if [[ "$phpVersion" != 7.3 ]]; then
+		sed -ri \
+			-e '/libzip-dev/d' \
+			"$dir/Dockerfile"
+	fi
+
 	# Copy the shell scripts
 	for name in entrypoint cron; do
 		cp "docker-$name.sh" "$dir/$name.sh"