diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 183cfe4..0afc2bf 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -2,10 +2,33 @@ before_script:
   - apk add --no-cache make wget git
   - make install-composer
   - make install
+  - mkdir -p result
 
 stages:
   - test
 
+lint:coding-guideline:
+  image: php:7.0-alpine
+  stage: test
+  script:
+    - ./vendor/bin/phpcs -s
+    - ./vendor/bin/phpcs -s > result/phpcs-summary.txt
+  artifacts:
+    when: on_failure
+    paths:
+      - result
+
+lint:php-mass-detection:
+  image: php:7.0-alpine
+  stage: test
+  script:
+    - ./vendor/bin/phpmd src text phpmd.xml > result/phpmd.txt
+    - ./vendor/bin/phpmd src html phpmd.xml > result/phpmd.html
+  artifacts:
+    when: on_failure
+    paths:
+      - result
+
 test:5.6:
   image: php:5.6-alpine
   stage: test
@@ -18,4 +41,10 @@ test:7.0:
   script:
     - ./vendor/bin/phpunit
 
+test:latest:
+  image: php:7-alpine
+  stage: test
+  script:
+    - ./vendor/bin/phpunit
+
 # Further stages, and jobs e.g. linting, cgl, etc.
diff --git a/composer.json b/composer.json
index 0db31eb..ec779e3 100644
--- a/composer.json
+++ b/composer.json
@@ -2,6 +2,13 @@
     "name": "siepmann/typo3_update",
     "description": "Auto migrate PHP Source of extensions to be compatible.",
     "type": "project",
+    "license": "GPL-2.0+",
+    "authors": [
+        {
+            "name": "Daniel Siepmann",
+            "email": "coding@daniel-siepmann.de"
+        }
+    ],
     "autoload": {
         "psr-4": {
             "Typo3Update\\Tests\\": "tests/",
@@ -22,15 +29,10 @@
         "squizlabs/php_codesniffer": "2.8.*",
         "symfony/yaml": "3.2.*"
     },
-    "license": "GPL-2.0+",
-    "authors": [
-        {
-            "name": "Daniel Siepmann",
-            "email": "coding@daniel-siepmann.de"
-        }
-    ],
     "require-dev": {
-        "phpunit/phpunit": "^5.7",
-        "symfony/finder": "^3.2"
+        "phpunit/phpunit": "5.7.*",
+        "symfony/finder": "3.2.*",
+        "phpmd/phpmd": "2.6.*",
+        "pdepend/pdepend": "2.5.*"
     }
 }
diff --git a/phpcs.xml.dist b/phpcs.xml.dist
new file mode 100644
index 0000000..c742021
--- /dev/null
+++ b/phpcs.xml.dist
@@ -0,0 +1,22 @@
+<?xml version="1.0"?>
+<ruleset name="PHP_CodeSniffer">
+    <description>The coding standard for this Project</description>
+    <rule ref="PSR2"/>
+    <file>./src</file>
+    <file>./tests</file>
+    <exclude-pattern>*/Fixtures/*</exclude-pattern>
+
+    <!-- Excludes for PHPCS Code Style -->
+    <rule ref="PSR1.Classes.ClassDeclaration.MissingNamespace">
+        <exclude-pattern>*Sniff.php$</exclude-pattern>
+        <exclude-pattern>*/Tokenizers/*</exclude-pattern>
+    </rule>
+    <rule ref="Squiz.Classes.ValidClassName.NotCamelCaps">
+        <exclude-pattern>*Sniff.php$</exclude-pattern>
+        <exclude-pattern>*/Tokenizers/*</exclude-pattern>
+    </rule>
+    <rule ref="Squiz.Classes.ValidClassName.NotCamelCaps">
+        <exclude-pattern>*Sniff.php$</exclude-pattern>
+        <exclude-pattern>*/Tokenizers/*</exclude-pattern>
+    </rule>
+</ruleset>
diff --git a/phpmd.xml b/phpmd.xml
new file mode 100644
index 0000000..829b5eb
--- /dev/null
+++ b/phpmd.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0"?>
+<ruleset name="My first PHPMD rule set"
+    xmlns="http://pmd.sf.net/ruleset/1.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://pmd.sf.net/ruleset/1.0.0
+    http://pmd.sf.net/ruleset_xml_schema.xsd"
+    xsi:noNamespaceSchemaLocation="
+    http://pmd.sf.net/ruleset_xml_schema.xsd">
+    <description>
+        My custom rule set that checks my code...
+    </description>
+
+    <rule ref="rulesets/cleancode.xml" />
+    <rule ref="rulesets/codesize.xml" />
+    <rule ref="rulesets/controversial.xml" />
+    <rule ref="rulesets/design.xml" />
+    <rule ref="rulesets/naming.xml" />
+    <rule ref="rulesets/unusedcode.xml" />
+</ruleset>