diff --git a/Dockerfile b/Dockerfile
index 0cb2679..4eab1cb 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM nginx:1.15.12-alpine
+FROM nginx:1.17.3-alpine
 
 RUN \
   apk add --no-cache \
@@ -25,8 +25,11 @@ RUN \
 
 EXPOSE 80 443
 
-ADD https://git.tt-rss.org/fox/tt-rss/archive/19.2.tar.gz /tmp/ttrss.tar.gz
+WORKDIR /app
 COPY CHECKS /app/CHECKS
+
+ADD https://git.tt-rss.org/fox/tt-rss/archive/19.8.tar.gz /tmp/ttrss.tar.gz
+
 COPY nginx.conf /etc/nginx/conf.d/default.conf
 COPY php-fpm.conf /etc/php7/php-fpm.d/ttrss.conf
 COPY install-db.php /var/lib/tt-rss-install/install-db.php
diff --git a/Readme.md b/Readme.md
index 2303d02..c24d734 100644
--- a/Readme.md
+++ b/Readme.md
@@ -8,6 +8,7 @@ Runs as a [Dockerfile deployment](http://dokku.viewdocs.io/dokku/deployment/meth
 dokku plugin:install https://github.com/dokku/dokku-postgres.git
 
 dokku apps:create ttrss
+dokku ps:scale ttrss web=0
 dokku postgres:create ttrssdb_11_2
 dokku postgres:link ttrssdb_11_2 ttrss
 dokku config:set ttrss SELF_URL_PATH=http://ttrss.example.com/
@@ -16,6 +17,7 @@ git remote add dokku dokku@example.com:ttrrs
 git push dokku
 
 dokku run ttrss php7 /var/lib/tt-rss-install/install-db.php
+dokku ps:scale ttrss web=1
 ```
 
 ## HTTPS
@@ -42,10 +44,12 @@ dokku letsencrypt:auto-renew ttrss
 
 ### TTRSS
 
-Check for updates in [config.php-dist](https://git.tt-rss.org/fox/tt-rss/commits/master/config.php-dist) and propagate them in `config.php`. In `Dockerfile`, update nginx base image and TTRSS release.
+* Upgrade base image in `Dockerfile`: https://hub.docker.com/_/nginx?tab=tags
+* Upgrade TTRSS release in `Dockerfile`
+* Propagate updates in `config.php-dist` to `config.php`: https://git.tt-rss.org/fox/tt-rss/src/19.8/config.php-dist
 
 ```bash
-dokku postgres:export ttrssdb_11_2 > ttrss.db
+dokku postgres:export ttrssdb_11_4 > ttrss.db
 git push dokku
 # go to Tiny Tiny RSS, it will ask to upgrade database, do it and check app is working
 rm ttrss.db
@@ -54,11 +58,13 @@ rm ttrss.db
 ### Database
 
 ```bash
-# upgrade from Postgres 10.2 to 11.2
+# upgrade from Postgres 10.2 to 11.4
 dokku plugins:upgrade postgres
-dokku postgres:clone ttrssdb_10_2 ttrssdb_11_2
-dokku postgres:link ttrssdb_11_2 ttrss
-dokku postgres:promote ttrssdb_11_2 ttrss
+dokku postgres:create ttrssdb_11_4
+dokku postgres:export ttrssdb_10_2 > ttrss.db
+dokku postgres:import ttrssdb_11_4 < ttrss.db
+dokku postgres:link ttrssdb_11_4 ttrss
+dokku postgres:promote ttrssdb_11_4 ttrss
 
 # check app is working, then delete old database
 dokku postgres:unlink ttrssdb_10_2 ttrss
diff --git a/config.php b/config.php
index 76caa86..c652ed3 100644
--- a/config.php
+++ b/config.php
@@ -20,12 +20,14 @@
   // ***********************************
 
   define('SELF_URL_PATH', getenv('SELF_URL_PATH'));
-  // Full URL of your tt-rss installation. This should be set to the
-  // location of tt-rss directory, e.g. http://example.org/tt-rss/
-  // You need to set this option correctly otherwise several features
-  // including PUSH, bookmarklets and browser integration will not work properly.
+  // This should be set to a fully qualified URL used to access
+  // your tt-rss instance over the net.
+  // The value should be a constant string literal. Please don't use
+  // PHP server variables here - you might introduce security
+  // issues on your install and cause hard to debug problems.
+  // If your tt-rss instance is behind a reverse proxy, use the external URL.
 
-  define('SINGLE_USER_MODE', true);
+  define('SINGLE_USER_MODE', false);
   // Operate in single user mode, disables all functionality related to
   // multiple users and authentication. Enabling this assumes you have
   // your tt-rss directory protected by other means (e.g. http auth).