diff --git a/conf/nginx-top.conf b/conf/nginx-top.conf
index a4d0929..85d056c 100644
--- a/conf/nginx-top.conf
+++ b/conf/nginx-top.conf
@@ -7,6 +7,5 @@
 ##       your own --- please do not ask for help from us.
 
 upstream php-fpm {
-	server unix:/var/run/php/php!!___PHPVER___!!-fpm.sock;
+	server unix:/var/run/php/php{{phpver}}-fpm.sock;
 }
-
diff --git a/management/backup.py b/management/backup.py
index bfae23b..ce53353 100755
--- a/management/backup.py
+++ b/management/backup.py
@@ -12,7 +12,7 @@ import dateutil.parser, dateutil.relativedelta, dateutil.tz
 import rtyaml
 from exclusiveprocess import Lock, CannotAcquireLock
 
-from utils import load_environment, shell, wait_for_service, fix_boto
+from utils import load_environment, shell, wait_for_service, fix_boto, get_php_version
 
 rsync_ssh_options = [
 	"--ssh-options= -i /root/.ssh/id_rsa_miab",
@@ -212,6 +212,7 @@ def get_target_type(config):
 
 def perform_backup(full_backup, user_initiated=False):
 	env = load_environment()
+	php_fpm = f"php{get_php_version()}-fpm"
 
 	# Create an global exclusive lock so that the backup script
 	# cannot be run more than one.
@@ -255,7 +256,7 @@ def perform_backup(full_backup, user_initiated=False):
 			if quit:
 				sys.exit(code)
 
-	service_command("php!!___PHPVER___!!-fpm", "stop", quit=True)
+	service_command(php_fpm, "stop", quit=True)
 	service_command("postfix", "stop", quit=True)
 	service_command("dovecot", "stop", quit=True)
 
@@ -289,7 +290,7 @@ def perform_backup(full_backup, user_initiated=False):
 		# Start services again.
 		service_command("dovecot", "start", quit=False)
 		service_command("postfix", "start", quit=False)
-		service_command("php!!___PHPVER___!!-fpm", "start", quit=False)
+		service_command(php_fpm, "start", quit=False)
 
 	# Remove old backups. This deletes all backup data no longer needed
 	# from more than 3 days ago.
diff --git a/management/utils.py b/management/utils.py
index f198286..28e387f 100644
--- a/management/utils.py
+++ b/management/utils.py
@@ -182,6 +182,9 @@ def fix_boto():
 	import os
 	os.environ["BOTO_CONFIG"] = "/etc/boto3.cfg"
 
+def get_php_version():
+	# Gets the version of PHP installed in the system.
+	return shell("check_output", ["/usr/bin/php", "-v"])[4:7]
 
 if __name__ == "__main__":
 	from web_update import get_web_domains
diff --git a/management/web_update.py b/management/web_update.py
index 67e2f07..ba801d8 100644
--- a/management/web_update.py
+++ b/management/web_update.py
@@ -7,7 +7,7 @@ import os.path, re, rtyaml
 from mailconfig import get_mail_domains
 from dns_update import get_custom_dns_config, get_dns_zones
 from ssl_certificates import get_ssl_certificates, get_domain_ssl_files, check_certificate
-from utils import shell, safe_domain_name, sort_domains
+from utils import shell, safe_domain_name, sort_domains, get_php_version
 
 def get_web_domains(env, include_www_redirects=True, exclude_dns_elsewhere=True):
 	# What domains should we serve HTTP(S) for?
@@ -76,6 +76,7 @@ def do_web_update(env):
 
 	# Build an nginx configuration file.
 	nginx_conf = open(os.path.join(os.path.dirname(__file__), "../conf/nginx-top.conf")).read()
+	nginx_conf = re.sub("{{phpver}}", get_php_version(), nginx_conf)
 
 	# Load the templates.
 	template0 = open(os.path.join(os.path.dirname(__file__), "../conf/nginx.conf")).read()
diff --git a/setup/functions.sh b/setup/functions.sh
index 7097ad6..1153079 100644
--- a/setup/functions.sh
+++ b/setup/functions.sh
@@ -222,14 +222,6 @@ function git_clone {
 	rm -rf $TMPPATH
 }
 
-OS=`lsb_release -d | sed 's/.*:\s*//' `
-
-# Expected php version
-if [ "$OS" == "Debian GNU/Linux 10 (buster)" ]; then
-	export PHP_VERSION="7.3"
-elif [ "$OS" == "Ubuntu 20.04 LTS" ]; then
-	export PHP_VERSION="7.4"
-fi
-
-sed -i "s|!!___PHPVER___!!|${PHP_VERSION}|g" conf/nginx-top.conf
-sed -i "s|!!___PHPVER___!!|${PHP_VERSION}|g" management/backup.py
+function php_version {
+	php --version | head -n 1 | cut -d " " -f 2 | cut -c 1-3
+}
diff --git a/setup/nextcloud.sh b/setup/nextcloud.sh
index d424737..1c9c91e 100755
--- a/setup/nextcloud.sh
+++ b/setup/nextcloud.sh
@@ -112,7 +112,7 @@ fi
 if [ ! -d /usr/local/lib/owncloud/ ] || [[ ! ${CURRENT_NEXTCLOUD_VER} =~ ^$nextcloud_ver ]]; then
 
 	# Stop php-fpm if running. If theyre not running (which happens on a previously failed install), dont bail.
-	service php$PHP_VERSION-fpm stop &> /dev/null || /bin/true
+	service php$(php_version)-fpm stop &> /dev/null || /bin/true
 
 	# Backup the existing ownCloud/Nextcloud.
 	# Create a backup directory to store the current installation and database to
@@ -285,7 +285,7 @@ if [ \( $? -ne 0 \) -a \( $? -ne 3 \) ]; then exit 1; fi
 
 # Set PHP FPM values to support large file uploads
 # (semicolon is the comment character in this file, hashes produce deprecation warnings)
-management/editconf.py /etc/php/$PHP_VERSION/fpm/php.ini -c ';' \
+management/editconf.py /etc/php/$(php_version)/fpm/php.ini -c ';' \
 	upload_max_filesize=16G \
 	post_max_size=16G \
 	output_buffering=16384 \
@@ -294,7 +294,7 @@ management/editconf.py /etc/php/$PHP_VERSION/fpm/php.ini -c ';' \
 	short_open_tag=On
 
 # Set Nextcloud recommended opcache settings
-management/editconf.py /etc/php/$PHP_VERSION/cli/conf.d/10-opcache.ini -c ';' \
+management/editconf.py /etc/php/$(php_version)/cli/conf.d/10-opcache.ini -c ';' \
 	opcache.enable=1 \
 	opcache.enable_cli=1 \
 	opcache.interned_strings_buffer=8 \
@@ -304,8 +304,8 @@ management/editconf.py /etc/php/$PHP_VERSION/cli/conf.d/10-opcache.ini -c ';' \
 	opcache.revalidate_freq=1
 
 # If apc is explicitly disabled we need to enable it
-if grep -q apc.enabled=0 /etc/php/$PHP_VERSION/mods-available/apcu.ini; then
-	management/editconf.py /etc/php/$PHP_VERSION/mods-available/apcu.ini -c ';' \
+if grep -q apc.enabled=0 /etc/php/$(php_version)/mods-available/apcu.ini; then
+	management/editconf.py /etc/php/$(php_version)/mods-available/apcu.ini -c ';' \
 		apc.enabled=1
 fi
 
@@ -330,4 +330,4 @@ rm -f /etc/cron.hourly/mailinabox-owncloud
 # ```
 
 # Enable PHP modules and restart PHP.
-restart_service php$PHP_VERSION-fpm
+restart_service php$(php_version)-fpm
diff --git a/setup/web.sh b/setup/web.sh
index f8c20f7..9db39c1 100755
--- a/setup/web.sh
+++ b/setup/web.sh
@@ -46,15 +46,15 @@ management/editconf.py /etc/nginx/nginx.conf -s \
 	ssl_protocols="TLSv1.2 TLSv1.3;"
 
 # Tell PHP not to expose its version number in the X-Powered-By header.
-management/editconf.py /etc/php/$PHP_VERSION/fpm/php.ini -c ';' \
+management/editconf.py /etc/php/$(php_version)/fpm/php.ini -c ';' \
 	expose_php=Off
 
 # Set PHPs default charset to UTF-8, since we use it. See #367.
-management/editconf.py /etc/php/$PHP_VERSION/fpm/php.ini -c ';' \
+management/editconf.py /etc/php/$(php_version)/fpm/php.ini -c ';' \
         default_charset="UTF-8"
 
 # Configure the path environment for php-fpm
-management/editconf.py /etc/php/$PHP_VERSION/fpm/pool.d/www.conf -c ';' \
+management/editconf.py /etc/php/$(php_version)/fpm/pool.d/www.conf -c ';' \
 	env[PATH]=/usr/local/bin:/usr/bin:/bin \
 
 # Configure php-fpm based on the amount of memory the machine has
@@ -64,7 +64,7 @@ management/editconf.py /etc/php/$PHP_VERSION/fpm/pool.d/www.conf -c ';' \
 TOTAL_PHYSICAL_MEM=$(head -n 1 /proc/meminfo | awk '{print $2}' || /bin/true)
 if [ $TOTAL_PHYSICAL_MEM -lt 1000000 ]
 then
-        management/editconf.py /etc/php/$PHP_VERSION/fpm/pool.d/www.conf -c ';' \
+        management/editconf.py /etc/php/$(php_version)/fpm/pool.d/www.conf -c ';' \
                 pm=ondemand \
                 pm.max_children=8 \
                 pm.start_servers=2 \
@@ -72,7 +72,7 @@ then
                 pm.max_spare_servers=3
 elif [ $TOTAL_PHYSICAL_MEM -lt 2000000 ]
 then
-        management/editconf.py /etc/php/$PHP_VERSION/fpm/pool.d/www.conf -c ';' \
+        management/editconf.py /etc/php/$(php_version)/fpm/pool.d/www.conf -c ';' \
                 pm=ondemand \
                 pm.max_children=16 \
                 pm.start_servers=4 \
@@ -80,14 +80,14 @@ then
                 pm.max_spare_servers=6
 elif [ $TOTAL_PHYSICAL_MEM -lt 3000000 ]
 then
-        management/editconf.py /etc/php/$PHP_VERSION/fpm/pool.d/www.conf -c ';' \
+        management/editconf.py /etc/php/$(php_version)/fpm/pool.d/www.conf -c ';' \
                 pm=dynamic \
                 pm.max_children=60 \
                 pm.start_servers=6 \
                 pm.min_spare_servers=3 \
                 pm.max_spare_servers=9
 else
-        management/editconf.py /etc/php/$PHP_VERSION/fpm/pool.d/www.conf -c ';' \
+        management/editconf.py /etc/php/$(php_version)/fpm/pool.d/www.conf -c ';' \
                 pm=dynamic \
                 pm.max_children=120 \
                 pm.start_servers=12 \
@@ -147,7 +147,7 @@ chown -R $STORAGE_USER $STORAGE_ROOT/www
 
 # Start services.
 restart_service nginx
-restart_service php$PHP_VERSION-fpm
+restart_service php$(php_version)-fpm
 
 # Open ports.
 ufw_allow http
diff --git a/setup/webmail.sh b/setup/webmail.sh
index 28457b2..f4ae1ed 100755
--- a/setup/webmail.sh
+++ b/setup/webmail.sh
@@ -198,4 +198,4 @@ chmod 664 $STORAGE_ROOT/mail/roundcube/roundcube.sqlite
 
 # Enable PHP modules.
 phpenmod -v php mcrypt imap
-restart_service php$PHP_VERSION-fpm
+restart_service php$(php_version)-fpm
diff --git a/setup/zpush.sh b/setup/zpush.sh
index 44d958d..5146011 100755
--- a/setup/zpush.sh
+++ b/setup/zpush.sh
@@ -102,7 +102,7 @@ EOF
 
 # Restart service.
 
-restart_service php$PHP_VERSION-fpm
+restart_service php$(php_version)-fpm
 
 # Fix states after upgrade