diff --git a/Dockerfile b/Dockerfile
index a912218..68fc195 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,36 +2,47 @@ FROM alpine:3.3
 MAINTAINER Wonderfall <wonderfall@mondedie.fr>
 MAINTAINER Hardware <contact@meshup.net>
 
+ARG GPG_rainloop="3B79 7ECE 694F 3B7B 70F3  11A4 ED7C 49D9 87DA 4591"
+
 ENV GID=991 UID=991
 
 RUN echo "@commuedge http://nl.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories \
+ && echo "@testing http://nl.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories \
  && apk -U add \
-    nginx \
-    php-fpm \
-    php-curl \
-    php-iconv \
-    php-xml \
-    php-dom \
-    php-openssl \
-    php-json \
-    php-zlib \
-    php-pdo_mysql \
-    php-pdo_sqlite \
-    php-sqlite3 \
-    supervisor \
     gnupg \
+    nginx \
+    supervisor \
     tini@commuedge \
- && wget -q http://repository.rainloop.net/v2/webmail/rainloop-community-latest.zip -P /tmp \
- && wget -q http://repository.rainloop.net/v2/webmail/rainloop-community-latest.zip.asc -P /tmp \
- && wget -q http://repository.rainloop.net/RainLoop.asc -P /tmp \
- && gpg --import /tmp/RainLoop.asc \
- && gpg --verify /tmp/rainloop-community-latest.zip.asc \
+    php7-fpm@testing \
+    php7-curl@testing \
+    php7-iconv@testing \
+    php7-xml@testing \
+    php7-dom@testing \
+    php7-openssl@testing \
+    php7-json@testing \
+    php7-zlib@testing \
+    php7-pdo_mysql@testing \
+    php7-pdo_sqlite@testing \
+    php7-sqlite3@testing \
+ && cd /tmp \
+ && wget -q http://repository.rainloop.net/v2/webmail/rainloop-community-latest.zip \
+ && wget -q http://repository.rainloop.net/v2/webmail/rainloop-community-latest.zip.asc \
+ && wget -q http://repository.rainloop.net/RainLoop.asc \
+ && echo "Verifying authenticity of rainloop-community-latest.zip using GPG..." \
+ && gpg --import RainLoop.asc \
+ && FINGERPRINT="$(LANG=C gpg --verify rainloop-community-latest.zip.asc rainloop-community-latest.zip 2>&1 \
+  | sed -n "s#Primary key fingerprint: \(.*\)#\1#p")" \
+ && if [ -z "${FINGERPRINT}" ]; then echo "Warning! Invalid GPG signature!" && exit 1; fi \
+ && if [ "${FINGERPRINT}" != "${GPG_rainloop}" ]; then echo "Warning! Wrong GPG fingerprint!" && exit 1; fi \
+ && echo "All seems good, now unzipping rainloop-community-latest.zip..." \
  && mkdir /rainloop && unzip -q /tmp/rainloop-community-latest.zip -d /rainloop \
+ && find /rainloop -type d -exec chmod 755 {} \; \
+ && find /rainloop -type f -exec chmod 644 {} \; \
  && apk del gnupg \
  && rm -rf /tmp/* /var/cache/apk/*
 
 COPY nginx.conf /etc/nginx/nginx.conf
-COPY php-fpm.conf /etc/php/php-fpm.conf
+COPY php-fpm.conf /etc/php7/php-fpm.conf
 COPY supervisord.conf /etc/supervisor/supervisord.conf
 COPY startup /usr/local/bin/startup
 
@@ -39,5 +50,4 @@ RUN chmod +x /usr/local/bin/startup
 
 VOLUME /rainloop/data
 EXPOSE 80
-LABEL description "Fast, simple and modern webmail client"
-CMD ["tini","--","startup"]
+CMD ["/sbin/tini","--","startup"]
\ No newline at end of file
diff --git a/README.md b/README.md
index cad83de..05ae530 100644
--- a/README.md
+++ b/README.md
@@ -2,17 +2,11 @@
 
 ![](https://i.goopics.net/nI.png)
 
-Rainloop is a SIMPLE, MODERN & FAST WEB-BASED EMAIL CLIENT. More details on the [official website](http://www.rainloop.net/).
-
-### Requirement
-
-- Docker 1.0 or higher
-- MySQL (Optional, for contacts database)
+Rainloop is a simple, modern & fast web-based client. More details on the [official website](http://www.rainloop.net/).
 
 ### Features
 - Based on Alpine 3.3
 - Latest Rainloop **Community Edition** (stable)
-- Extremely lightweight
 - Contacts (DB) : sqlite, or mysql (server not built-in)
 
 ### How to use
@@ -25,6 +19,18 @@ docker run -d \
   hardware/rainloop
 ```
 
+### Reverse proxy example with nginx
+
+https://github.com/hardware/mailserver/wiki/Reverse-proxy-configuration
+
+### Initial configuration
+
+https://github.com/hardware/mailserver/wiki/Rainloop-initial-configuration
+
+#### Build-time variables
+
+- **GPG_rainloop** : fingerprint of signing key
+
 ### Environment variables
 
 - **UID** : rainloop user id (*optional*, default: 991)
@@ -39,9 +45,6 @@ rainloop:
   container_name: rainloop
   links:
     - mariadb:mariadb
-  environment:
-    - GID=991
-    - UID=991
   volumes:
     - /mnt/docker/rainloop:/rainloop/data
 
@@ -63,12 +66,4 @@ mariadb:
 
 ```
 docker-compose up -d
-```
-
-### Reverse proxy example with nginx
-
-https://github.com/hardware/mailserver/wiki/Reverse-proxy-configuration
-
-### Initial configuration
-
-https://github.com/hardware/mailserver/wiki/Rainloop-initial-configuration
+```
\ No newline at end of file
diff --git a/nginx.conf b/nginx.conf
index 9d234f8..ef0f579 100644
--- a/nginx.conf
+++ b/nginx.conf
@@ -4,8 +4,8 @@ pid /var/run/nginx.pid;
 daemon off;
 
 events {
-    worker_connections 1024;
-    use epoll;
+  worker_connections 1024;
+  use epoll;
 }
 
 http {
diff --git a/startup b/startup
index a60acdb..c2bbe52 100644
--- a/startup
+++ b/startup
@@ -5,8 +5,6 @@ addgroup -g ${GID} rainloop && adduser -h /rainloop -s /bin/sh -D -G rainloop -u
 
 # Set permissions
 chown -R rainloop:rainloop /rainloop /var/run/php-fpm.sock /var/lib/nginx /tmp
-find /rainloop -type d -exec chmod 755 {} \;
-find /rainloop -type f -exec chmod 644 {} \;
 
 # RUN !
 supervisord -c /etc/supervisor/supervisord.conf
diff --git a/supervisord.conf b/supervisord.conf
index 61657fa..f2cd4b1 100644
--- a/supervisord.conf
+++ b/supervisord.conf
@@ -2,7 +2,7 @@
 nodaemon=true
 
 [program:php-fpm]
-command=php-fpm
+command=php-fpm7
 
 [program:nginx]
 command=nginx