diff --git a/composer.json b/composer.json
index 835e40f7..e7fdf1b7 100644
--- a/composer.json
+++ b/composer.json
@@ -24,6 +24,7 @@
     "source": "https://github.com/dealerdirect/phpcodesniffer-composer-installer"
   },
   "require": {
+    "php": "^5.3|^7",
     "composer-plugin-api": "^1.0",
     "squizlabs/php_codesniffer": "*"
   },
diff --git a/src/Plugin.php b/src/Plugin.php
index a1727b4e..b12a6ccd 100644
--- a/src/Plugin.php
+++ b/src/Plugin.php
@@ -113,7 +113,7 @@ public function activate(Composer $composer, IOInterface $io)
      */
     private function init()
     {
-        $this->installedPaths = [];
+        $this->installedPaths = array();
 
         $this->processBuilder = new ProcessBuilder();
         $this->processBuilder->setPrefix($this->composer->getConfig()->get('bin-dir') . DIRECTORY_SEPARATOR . 'phpcs');
@@ -126,14 +126,14 @@ private function init()
      */
     public static function getSubscribedEvents()
     {
-        return [
-            ScriptEvents::POST_INSTALL_CMD => [
-                ['onDependenciesChangedEvent', 0],
-            ],
-            ScriptEvents::POST_UPDATE_CMD => [
-                ['onDependenciesChangedEvent', 0],
-            ],
-        ];
+        return array(
+            ScriptEvents::POST_INSTALL_CMD => array(
+                array('onDependenciesChangedEvent', 0),
+            ),
+            ScriptEvents::POST_UPDATE_CMD => array(
+                array('onDependenciesChangedEvent', 0),
+            ),
+        );
     }
 
     /**
@@ -178,7 +178,7 @@ private function loadInstalledPaths()
     {
         if ($this->isPHPCodeSnifferInstalled() === true) {
             $output = $this->processBuilder
-                ->setArguments(['--config-show', self::PHPCS_CONFIG_KEY])
+                ->setArguments(array('--config-show', self::PHPCS_CONFIG_KEY))
                 ->getProcess()
                 ->mustRun()
                 ->getOutput();
@@ -204,7 +204,7 @@ private function saveInstalledPaths()
         // Check if we found installed paths to set.
         if (count($this->installedPaths) !== 0) {
             $paths = implode(',', $this->installedPaths);
-            $arguments = ['--config-set', self::PHPCS_CONFIG_KEY, $paths];
+            $arguments = array('--config-set', self::PHPCS_CONFIG_KEY, $paths);
             $configMessage = sprintf(
                 'PHP CodeSniffer Config <info>%s</info> <comment>set to</comment> <info>%s</info>',
                 self::PHPCS_CONFIG_KEY,
@@ -212,7 +212,7 @@ private function saveInstalledPaths()
             );
         } else {
             // Delete the installed paths if none were found.
-            $arguments = ['--config-delete', self::PHPCS_CONFIG_KEY];
+            $arguments = array('--config-delete', self::PHPCS_CONFIG_KEY);
             $configMessage = sprintf(
                 'PHP CodeSniffer Config <info>%s</info> <comment>delete</comment>',
                 self::PHPCS_CONFIG_KEY
@@ -271,7 +271,7 @@ private function updateInstalledPaths()
     {
         $changes = false;
 
-        $searchPaths = [getcwd()];
+        $searchPaths = array(getcwd());
         $codingStandardPackages = $this->getPHPCodingStandardPackages();
         foreach ($codingStandardPackages as $package) {
             $searchPaths[] = $this->composer->getInstallationManager()->getInstallPath($package);