diff --git a/Dockerfile b/Dockerfile
index 614461c..720be23 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -35,7 +35,9 @@ RUN unzip /var/www/grav-admin-v$GRAV_VERSION.zip -d /var/www/ \
 ADD https://raw.githubusercontent.com/getgrav/grav/fb20b58369d5e0140a4fa6da06edf8f40412f7bf/webserver-configs/nginx.conf /etc/nginx/conf.d/default.conf
 RUN sed -i 's/root \/home\/USER\/www\/html/root \/var\/www/g' /etc/nginx/conf.d/default.conf \
     && sed -i 's/#listen 80;/listen 80;/g' /etc/nginx/conf.d/default.conf \
-    && usermod -aG www-data nginx
+    && apk add --no-cache --virtual .build-deps shadow \
+    && usermod -aG www-data nginx \
+    && apk del .build-deps
 
 # Include Startup Script
 COPY /resources/ /resources/