diff --git a/composer.json b/composer.json
index 2200585..1331bbf 100644
--- a/composer.json
+++ b/composer.json
@@ -7,7 +7,10 @@
         "composer/installers": "~1.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^5.5"
+        "phpunit/phpunit": "^5.5",
+        "phpcompatibility/php-compatibility": "*",
+        "squizlabs/php_codesniffer": "3.*",
+        "wp-coding-standards/wpcs": "^0.14.1"
     },
     "license": "MIT",
     "authors": [
@@ -24,6 +27,12 @@
             "composer install",
             "bin/install-wp-tests.sh wordpress wordpress wordpress",
             "vendor/bin/phpunit"
+        ],
+        "post-install-cmd": [
+            "\"vendor/bin/phpcs\" --config-set installed_paths vendor/phpcompatibility/php-compatibility,vendor/wp-coding-standards/wpcs"
+        ],
+        "post-update-cmd": [
+            "\"vendor/bin/phpcs\" --config-set installed_paths vendor/phpcompatibility/php-compatibility,vendor/wp-coding-standards/wpcs"
         ]
     }
 }
diff --git a/phpcs.xml b/phpcs.xml
index 3313e50..a3a5f6a 100644
--- a/phpcs.xml
+++ b/phpcs.xml
@@ -4,6 +4,8 @@
 	<file>./activitypub.php</file>
 	<file>./includes/</file>
 	<config name="minimum_supported_wp_version" value="4.7"/>
+	<config name="installed_paths" value="vendor/phpcompatibility/php-compatibility" />
+	<config name="installed_paths" value="vendor/wp-coding-standards/wpcs" />
 	<exclude-pattern>*\.(inc|css|js|svg)</exclude-pattern>
 	<exclude-pattern>*/vendor/*</exclude-pattern>
 	<exclude-pattern>*/node_modules/*</exclude-pattern>