diff --git a/.travis.yml b/.travis.yml
index 3abfce66..cab5494a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,10 +5,13 @@ php:
   - 5.5
   - 5.6
   - 7.0
+  - 7.1
   - hhvm
 install:
   - if [ -n "$GITHUB_OAUTH_TOKEN" ]; then composer config github-oauth.github.com ${GITHUB_OAUTH_TOKEN}; fi;
   - composer install --no-interaction
+  # test app with symfony3 components in latest php
+  - if [[ ${TRAVIS_PHP_VERSION:0:3} == "7.1" ]]; then composer update && composer require sebastian/phpcpd:dev-master; fi
 script:
   - vendor/phpunit/phpunit/phpunit
   - bin/ci.sh
diff --git a/README.md b/README.md
index b02c8a4e..044529ba 100644
--- a/README.md
+++ b/README.md
@@ -71,6 +71,23 @@ But I wouldn't recommend it. In my experience *one* QA tool which analyzes
 *N* projects is better than *N* projects with *N* analyzers. It's up to you
 how many repositories you want to update when new version is released.
 
+##### Symfony3 components
+
+Do you have problems with dependencies
+([symfony components](https://github.com/EdgedesignCZ/phpqa/issues/22), [phpcpd](https://github.com/EdgedesignCZ/phpqa/issues/19), ...)?
+Check if you can [install phpqa globally](#circleci---artifacts--global-installation).
+Or install dev-master versions of `sebastian/phpcpd` and `henrikbjorn/lurker`:
+
+```
+{
+    "require-dev": {
+        "edgedesign/phpqa": "dev-master",
+        "henrikbjorn/lurker": "dev-master",
+        "sebastian/phpcpd": "dev-master"
+    }
+}
+```
+
 ### Docker
 
 ```bash
@@ -272,6 +289,28 @@ public function ciPhpqa()
 phpqa --verbose --report --analyzedDir ./ --buildDir ./var/CI --ignoredDirs=bin,log,temp,var,vendor,www
 ```
 
+## Circle.ci - artifacts + global installation
+
+```
+machine:
+    php:
+        version: 7.0.4
+
+dependencies:
+    cache_directories:
+        - ~/.composer/cache
+    post:
+        - 'git clone https://github.com/EdgedesignCZ/phpqa.git ./qa && cd qa && composer install --no-dev'
+
+test:
+    override:
+        - vendor/bin/phpunit --testdox-html ./var/tests/testdox.html --testdox-text ./var/tests/testdox.txt --log-junit $CIRCLE_TEST_REPORTS/phpunit/junit.xml
+        - qa/phpqa --report --verbose --buildDir var/QA --ignoredDirs vendor --tools=phpcs:0,phpmd:0,phpcpd:0,phploc,pdepend,phpmetrics
+    post:
+        - cp -r ./var/QA $CIRCLE_ARTIFACTS
+        - cp -r ./var/tests $CIRCLE_ARTIFACTS
+```
+
 ## Contributing
 
 Contributions from others would be very much appreciated! Send 
diff --git a/composer.json b/composer.json
index b424a180..9af6857a 100644
--- a/composer.json
+++ b/composer.json
@@ -18,14 +18,15 @@
     "bin": ["phpqa"],
     "require": {
         "php": ">=5.4",
+        "henrikbjorn/lurker": "dev-master",
         "codegyre/robo": "*",
         "phpmd/phpmd" : "*",
         "phploc/phploc": "*",
-        "symfony/dependency-injection": "~2.8",
-        "symfony/filesystem": "~2.8",
-        "symfony/process": "~2.8",
-        "symfony/finder": "~2.8",
-        "symfony/yaml": "~2.8",
+        "symfony/dependency-injection": ">=2.8",
+        "symfony/filesystem": ">=2.8",
+        "symfony/process": ">=2.8",
+        "symfony/finder": ">=2.8",
+        "symfony/yaml": ">=2.8",
         "pdepend/pdepend": "*",
         "sebastian/phpcpd": "*",
         "squizlabs/php_codesniffer": "*",
diff --git a/composer.lock b/composer.lock
index d50fc31b..4965229c 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,8 +4,8 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "hash": "62f9707067ef6e5eb8e08d8d3bbc5bb5",
-    "content-hash": "d23899e9277813bce793d91987c03d97",
+    "hash": "4f109bd4ee79898a48b2f75fab86284d",
+    "content-hash": "bbab948633ba13e4e7758fbd5d8068cb",
     "packages": [
         {
             "name": "codegyre/robo",
@@ -64,22 +64,22 @@
         },
         {
             "name": "henrikbjorn/lurker",
-            "version": "1.1.0",
+            "version": "dev-master",
             "source": {
                 "type": "git",
                 "url": "https://github.com/flint/Lurker.git",
-                "reference": "ab45f9cefe600065cc3137a238217598d3a1d062"
+                "reference": "712d3ef19bef161daa2ba0e0237c6b875587a089"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/flint/Lurker/zipball/ab45f9cefe600065cc3137a238217598d3a1d062",
-                "reference": "ab45f9cefe600065cc3137a238217598d3a1d062",
+                "url": "https://api.github.com/repos/flint/Lurker/zipball/712d3ef19bef161daa2ba0e0237c6b875587a089",
+                "reference": "712d3ef19bef161daa2ba0e0237c6b875587a089",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.3.3",
-                "symfony/config": "~2.2",
-                "symfony/event-dispatcher": "~2.2"
+                "symfony/config": "^2.2|^3.0",
+                "symfony/event-dispatcher": "^2.2|^3.0"
             },
             "suggest": {
                 "ext-inotify": ">=0.1.6"
@@ -119,7 +119,7 @@
                 "resource",
                 "watching"
             ],
-            "time": "2015-10-27 09:19:19"
+            "time": "2016-03-16 15:22:20"
         },
         {
             "name": "hoa/compiler",
@@ -2706,7 +2706,9 @@
     ],
     "aliases": [],
     "minimum-stability": "stable",
-    "stability-flags": [],
+    "stability-flags": {
+        "henrikbjorn/lurker": 20
+    },
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
diff --git a/src/Task/TableSummary.php b/src/Task/TableSummary.php
index 0230cf2e..e1b6674b 100644
--- a/src/Task/TableSummary.php
+++ b/src/Task/TableSummary.php
@@ -31,7 +31,7 @@ public function __invoke(array $usedTools)
         $failedTools = [];
         foreach ($usedTools as $tool) {
             list($isOk, $errorsCount) = $tool->analyzeResult();
-            $totalErrors += $errorsCount;
+            $totalErrors += (int) $errorsCount;
             $table->addRow(array(
                 "<comment>{$tool}</comment>",
                 $tool->getAllowedErrorsCount(),