diff --git a/composer.json b/composer.json
index 275ac5fa..978d816c 100644
--- a/composer.json
+++ b/composer.json
@@ -26,7 +26,8 @@
         "pantheon-systems/pantheon-wordpress-upstream-tests": "dev-master",
         "wp-coding-standards/wpcs": "^2.1",
         "dealerdirect/phpcodesniffer-composer-installer": "^0.5.0",
-        "phpunit/phpunit": "^6 || ^7"
+        "phpunit/phpunit": "^6 || ^7",
+        "phpcompatibility/php-compatibility": "^9.3"
     },
     "scripts": {
         "lint": "@phpcs",
diff --git a/composer.lock b/composer.lock
index c33776f1..fa2d4a56 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "e913947b06a743f666854a82a2c27470",
+    "content-hash": "595cc964fa99c2e3a6724b441e6f54ff",
     "packages": [
         {
             "name": "solarium/solarium",
@@ -1112,6 +1112,64 @@
             "description": "Library for handling version information and constraints",
             "time": "2017-03-05T17:38:23+00:00"
         },
+        {
+            "name": "phpcompatibility/php-compatibility",
+            "version": "9.3.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/PHPCompatibility/PHPCompatibility.git",
+                "reference": "bfca2be3992f40e92206e5a7ebe5eaee37280b58"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/PHPCompatibility/PHPCompatibility/zipball/bfca2be3992f40e92206e5a7ebe5eaee37280b58",
+                "reference": "bfca2be3992f40e92206e5a7ebe5eaee37280b58",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3",
+                "squizlabs/php_codesniffer": "^2.3 || ^3.0.2"
+            },
+            "conflict": {
+                "squizlabs/php_codesniffer": "2.6.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "~4.5 || ^5.0 || ^6.0 || ^7.0"
+            },
+            "suggest": {
+                "dealerdirect/phpcodesniffer-composer-installer": "^0.5 || This Composer plugin will sort out the PHPCS 'installed_paths' automatically.",
+                "roave/security-advisories": "dev-master || Helps prevent installing dependencies with known security issues."
+            },
+            "type": "phpcodesniffer-standard",
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "LGPL-3.0-or-later"
+            ],
+            "authors": [
+                {
+                    "name": "Wim Godden",
+                    "homepage": "https://github.com/wimg",
+                    "role": "lead"
+                },
+                {
+                    "name": "Juliette Reinders Folmer",
+                    "homepage": "https://github.com/jrfnl",
+                    "role": "lead"
+                },
+                {
+                    "name": "Contributors",
+                    "homepage": "https://github.com/PHPCompatibility/PHPCompatibility/graphs/contributors"
+                }
+            ],
+            "description": "A set of sniffs for PHP_CodeSniffer that checks for PHP cross-version compatibility.",
+            "homepage": "http://techblog.wimgodden.be/tag/codesniffer/",
+            "keywords": [
+                "compatibility",
+                "phpcs",
+                "standards"
+            ],
+            "time": "2019-10-16T21:24:24+00:00"
+        },
         {
             "name": "phpdocumentor/reflection-common",
             "version": "1.0.1",
diff --git a/phpcs.xml.dist b/phpcs.xml.dist
index ac5cf5e1..ae0de9b4 100644
--- a/phpcs.xml.dist
+++ b/phpcs.xml.dist
@@ -4,6 +4,7 @@
 
 	<rule ref="WordPress-Core" />
 	<rule ref="WordPress-Docs" />
+	<rule ref="PHPCompatibility"/>
 
 	<!-- Check all PHP files in directory tree by default. -->
 	<arg name="extensions" value="php"/>
@@ -12,6 +13,10 @@
 	<!-- Show progress and sniff codes in all reports -->
 	<arg value="ps"/>
 
+	<!-- Minimum PHP and WP versions -->
+	<config name="testVersion" value="7.1-"/>
+	<config name="minimum_supported_wp_version" value="4.6"/>
+
 	<exclude-pattern>*/examples/*</exclude-pattern>
 	<exclude-pattern>*/node_modules/*</exclude-pattern>
 	<exclude-pattern>*/tests/*</exclude-pattern>