diff --git a/composer.json b/composer.json
index 7ce73841..35b6d721 100644
--- a/composer.json
+++ b/composer.json
@@ -4,9 +4,10 @@
 	"type": "project",
 	"license": "GPL-2.0-or-later",
 	"require": {
+		"php": ">=7.1",
 		"wp-coding-standards/wpcs": "^0.14.0",
 		"fig-r/psr2r-sniffer": "^0.5.0",
-		"squizlabs/php_codesniffer": "~3.2.0"
+		"squizlabs/php_codesniffer": "~3.4.0"
 	},
 	"require-dev": {
 		"phpunit/phpunit": "^5.7"
diff --git a/tests/FixtureTests.php b/tests/FixtureTests.php
index 4f10b081..fbb6df9e 100644
--- a/tests/FixtureTests.php
+++ b/tests/FixtureTests.php
@@ -54,6 +54,10 @@ public function setUp() {
 		$this->config->cache     = false;
 		$this->config->standards = [ 'HM' ];
 
+		// Keeping the tabWidth set inline with WPCS.
+		// See: https://github.com/humanmade/coding-standards/pull/88#issuecomment-464076803
+		$this->config->tabWidth = 4;
+
 		$this->ruleset = new Ruleset( $this->config );
 	}