diff --git a/.travis.yml b/.travis.yml
index 74feb4ac1..a3fda8cee 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,8 +11,6 @@ python:
 install:
   - "pip install --upgrade --requirement requirements.txt"
   - "npm install"
-  - "node_modules/.bin/bower install"
-  - "node_modules/.bin/gulp --production"
 script:
   - "flake8 openslides tests"
   - "isort --check-only --recursive openslides tests"
diff --git a/README.rst b/README.rst
index f71473673..8ef3ccc57 100644
--- a/README.rst
+++ b/README.rst
@@ -186,30 +186,29 @@ Installation and start of the development version
 
        $ pip install -r requirements.txt
 
-5. Install all npm and bower packages
+5. Install all npm and bower packages and concat and copy all third party
+   JavaScript and Cascading Style Sheets libraries
 
    For Unix and Mac OS X run::
 
        $ npm install
-       $ node_modules/.bin/bower install
 
    For Windows run::
 
        > npm install
-       > node_modules\.bin\bower install
 
-6. Concat and copy all third party JavaScript and Cascading Style Sheets
-   libraries
+   Later you might want to rerun gulp so that the third party JavaScript
+   and Cascading Style Sheets libraries are not minified.
 
-   For Unix and Mac OS X run::
+   To do this for Unix and Mac OS X run::
 
        $ node_modules/.bin/gulp
 
-   For Windows run::
+   To do this for Windows run::
 
        > node_modules\.bin\gulp
 
-7. Start OpenSlides
+6. Start OpenSlides
 
    Use the command-line interface::
 
diff --git a/bower.json b/bower.json
index 51ebe4e00..38edcca56 100644
--- a/bower.json
+++ b/bower.json
@@ -33,6 +33,11 @@
     "roboto-condensed": "~0.3.0",
     "open-sans-fontface": "https://github.com/OpenSlides/open-sans.git#1.4.2.post1"
   },
+  "overrides": {
+    "pdfjs-dist": {
+      "main": "build/pdf.combined.js"
+    }
+  },
   "resolutions": {
     "angular": ">=1.4.9 <1.5"
   }
diff --git a/gulpfile.js b/gulpfile.js
index ba3a1b0ef..2d683ffd6 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -25,7 +25,6 @@ var argv = require('yargs').argv,
     jshint = require('gulp-jshint'),
     mainBowerFiles = require('main-bower-files'),
     path = require('path'),
-    rename = require('gulp-rename'),
     through = require('through2'),
     uglify = require('gulp-uglify'),
     vsprintf = require('sprintf-js').vsprintf;
@@ -74,13 +73,6 @@ gulp.task('ckeditor', function () {
         .pipe(gulp.dest(path.join(output_directory, 'ckeditor')));
 });
 
-// Extra task only for PDF.js
-gulp.task('pdfjs', function () {
-    return gulp.src(path.join('bower_components', 'pdfjs-dist', 'build', 'pdf.worker.js'))
-        .pipe(rename(path.join('openslides-libs.worker.js')))
-        .pipe(gulp.dest(path.join(output_directory, 'js')));
-});
-
 // Compiles translation files (*.po) to *.json and saves them in the directory
 // openslides/static/i18n/.
 gulp.task('translations', function () {
@@ -92,7 +84,7 @@ gulp.task('translations', function () {
 });
 
 // Gulp default task. Runs all other tasks before.
-gulp.task('default', ['js-libs', 'css-libs', 'fonts-libs', 'ckeditor', 'pdfjs', 'translations'], function () {});
+gulp.task('default', ['js-libs', 'css-libs', 'fonts-libs', 'ckeditor', 'translations'], function () {});
 
 
 /**
diff --git a/openslides/core/static/templates/projector.html b/openslides/core/static/templates/projector.html
index ab04adea1..089967f66 100644
--- a/openslides/core/static/templates/projector.html
+++ b/openslides/core/static/templates/projector.html
@@ -7,7 +7,6 @@
 <link rel="stylesheet" href="static/css/projector.css">
 <link rel="icon" href="/static/img/favicon.png">
 <script src="static/js/openslides-libs.js"></script>
-<script src="static/js/openslides-libs.worker.js"></script>
 
 <style type="text/css">
   #header, #footer {
diff --git a/package.json b/package.json
index 42028611a..145ad8434 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,9 @@
 {
   "name": "OpenSlides",
   "private": true,
+  "scripts": {
+    "prepublish": "bower install && gulp --production"
+  },
   "devDependencies": {
     "bower": "~1.7.2",
     "es6-promise": "~3.0.2",
@@ -10,7 +13,6 @@
     "gulp-cssnano": "~2.1.0",
     "gulp-if": "~2.0.0",
     "gulp-jshint": "~2.0.0",
-    "gulp-rename": "~1.2.2",
     "gulp-uglify": "~1.5.1",
     "main-bower-files": "~2.11.1",
     "po2json": "~0.4.1",