diff --git a/app/javascript/mastodon/components/column_back_button_slim.js b/app/javascript/mastodon/components/column_back_button_slim.js
index 3b4f46d99f4..964c100befe 100644
--- a/app/javascript/mastodon/components/column_back_button_slim.js
+++ b/app/javascript/mastodon/components/column_back_button_slim.js
@@ -1,17 +1,8 @@
 import React from 'react';
 import { FormattedMessage } from 'react-intl';
-import PropTypes from 'prop-types';
+import ColumnBackButton from './column_back_button';
 
-export default class ColumnBackButtonSlim extends React.PureComponent {
-
-  static contextTypes = {
-    router: PropTypes.object,
-  };
-
-  handleClick = () => {
-    if (window.history && window.history.length === 1) this.context.router.history.push('/');
-    else this.context.router.history.goBack();
-  }
+export default class ColumnBackButtonSlim extends ColumnBackButton {
 
   render () {
     return (
diff --git a/docker-compose.yml b/docker-compose.yml
index cfe70c5e8f1..aaa3a447828 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -4,6 +4,8 @@ services:
   db:
     restart: always
     image: postgres:9.6-alpine
+    networks:
+      - internal_network
 ### Uncomment to enable DB persistance
 #    volumes:
 #      - ./postgres:/var/lib/postgresql/data
@@ -11,6 +13,8 @@ services:
   redis:
     restart: always
     image: redis:4.0-alpine
+    networks:
+      - internal_network
 ### Uncomment to enable REDIS persistance
 #    volumes:
 #      - ./redis:/data
@@ -21,6 +25,9 @@ services:
     restart: always
     env_file: .env.production
     command: bundle exec rails s -p 3000 -b '0.0.0.0'
+    networks:
+      - external_network
+      - internal_network
     ports:
       - "3000:3000"
     depends_on:
@@ -37,6 +44,9 @@ services:
     restart: always
     env_file: .env.production
     command: npm run start
+    networks:
+      - external_network
+      - internal_network
     ports:
       - "4000:4000"
     depends_on:
@@ -52,6 +62,14 @@ services:
     depends_on:
       - db
       - redis
+    networks:
+      - external_network
+      - internal_network
     volumes:
       - ./public/packs:/mastodon/public/packs
       - ./public/system:/mastodon/public/system
+
+networks:
+  external_network:
+  internal_network:
+    internal: true
diff --git a/lib/tasks/assets.rake b/lib/tasks/assets.rake
index f60c1b9f208..0826f018641 100644
--- a/lib/tasks/assets.rake
+++ b/lib/tasks/assets.rake
@@ -9,7 +9,7 @@ end
 
 namespace :assets do
   desc 'Generate static pages'
-  task :generate_static_pages do
+  task generate_static_pages: :environment do
     render_static_page 'errors/500', layout: 'error', dest: Rails.root.join('public', 'assets', '500.html')
   end
 end