diff --git a/Dockerfile b/Dockerfile
index 8a60546..6bd7579 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM nginx:1.17.3-alpine
+FROM nginxinc/nginx-unprivileged:1.17.8-alpine
 LABEL MAINTAINER="BBT Software AG <devadmin@bbtsoftware.ch>"
 
 ENV CHK_DOCKER_API_VERSION v1.38
@@ -10,10 +10,15 @@ ENV TZ UTC
 
 COPY index.html /usr/share/nginx/html/index.html
 
+USER root
+RUN chmod 775 /usr/share/nginx/html/
+RUN chown nginx:nginx /usr/share/nginx/html/
 RUN apk add --no-cache bash curl jq && \
     echo $TZ > /etc/timezone
+USER nginx
 
 COPY docker-entrypoint.sh /usr/local/bin/
+
 ENTRYPOINT ["docker-entrypoint.sh"]
 
 EXPOSE 80
diff --git a/README.md b/README.md
index 2bf7eb4..de12afa 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,10 @@
 
 Docker image to monitor a [Docker Swarm](https://docs.docker.com/engine/swarm/).
 
+Supported monitoring systems:
+
+* [PRTG Network Monitor](https://www.paessler.com/prtg/)
+
 ## Information
 
 | Service | Stats                                                                                     |
@@ -27,8 +31,9 @@ docker pull bbtsoftwareag/swarm-monitor
 | Tag    | Description                                                                             | Size                                                                                                                   |
 |--------|-----------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------|
 | latest | Latest master build                                                                     | ![Size](https://shields.beevelop.com/docker/image/image-size/bbtsoftwareag/swarm-monitor/latest.svg?style=flat-square) |
-| 1.0.0  | Release [1.0.0](https://github.com/bbtsoftware/docker-swarm-monitor/releases/tag/1.0.0) | ![Size](https://shields.beevelop.com/docker/image/image-size/bbtsoftwareag/swarm-monitor/1.0.0.svg?style=flat-square)  |
+| 1.2.0  | Release [1.2.0](https://github.com/bbtsoftware/docker-swarm-monitor/releases/tag/1.2.0) | ![Size](https://shields.beevelop.com/docker/image/image-size/bbtsoftwareag/swarm-monitor/1.2.0.svg?style=flat-square)  |
 | 1.1.0  | Release [1.1.0](https://github.com/bbtsoftware/docker-swarm-monitor/releases/tag/1.1.0) | ![Size](https://shields.beevelop.com/docker/image/image-size/bbtsoftwareag/swarm-monitor/1.1.0.svg?style=flat-square)  |
+| 1.0.0  | Release [1.0.0](https://github.com/bbtsoftware/docker-swarm-monitor/releases/tag/1.0.0) | ![Size](https://shields.beevelop.com/docker/image/image-size/bbtsoftwareag/swarm-monitor/1.0.0.svg?style=flat-square)  |
 
 ### Volumes
 
@@ -92,4 +97,4 @@ docker run -d \
   -e CHK_MONITOR=prtg \
   -e "CHK_SERVICES=monitor_app.1 proxy_app.3" \
   bbtsoftwareag/swarm-monitor:latest
-```
\ No newline at end of file
+```