diff --git a/Dockerfile b/Dockerfile
index 8f2ccd28..fbf756c1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,7 @@ FROM debian:buster-slim
 ARG dir="/home/pi/pialert"
 
 #Update and reduce image size
-RUN apt update \
+RUN apt-get update \
     && apt-get install --no-install-recommends apt-utils cron sudo lighttpd php php-cgi php-fpm php-sqlite3 sqlite3 dnsutils net-tools python iproute2 -y \
     #Install without the --no-install-recommends flag
     && apt-get install curl arp-scan -y \