diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0ef04e44..d1907c54 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,8 @@ All notable changes to this project will be documented in this file. This projec
 
 ## unreleased
 
+Requires PHP 5.6 and WordPress 4.7 or above
+
 * Enhance: adjust styling for setup instructions (#215, props timse201)
 
 
diff --git a/inc/class-cachify.php b/inc/class-cachify.php
index 6f9d1745..70ae1ab5 100644
--- a/inc/class-cachify.php
+++ b/inc/class-cachify.php
@@ -1392,7 +1392,14 @@ public static function set_cache( $data ) {
 		 * @param string $cache_hash    The cache hash.
 		 * @param int    $cache_expires Cache validity period.
 		 */
-		$should_cache = apply_filters( 'cachify_store_item', true, $data, self::$method, self::_cache_hash(), self::_cache_expires() );
+		$should_cache = apply_filters(
+			'cachify_store_item',
+			200 === http_response_code(),
+			$data,
+			self::$method,
+			self::_cache_hash(),
+			self::_cache_expires()
+		);
 
 		/* Save? */
 		if ( $should_cache ) {
diff --git a/phpcs.xml b/phpcs.xml
index be0ffbf5..750725cb 100644
--- a/phpcs.xml
+++ b/phpcs.xml
@@ -20,7 +20,7 @@
     <exclude-pattern>vendor/*</exclude-pattern>
 
     <!-- WordPress coding standards -->
-    <config name="minimum_supported_wp_version" value="4.4"/>
+    <config name="minimum_supported_wp_version" value="4.7"/>
     <rule ref="WordPress"/>
     <rule ref="WordPress.WP.I18n">
         <properties>
@@ -29,6 +29,6 @@
     </rule>
 
     <!-- Include sniffs for PHP cross-version compatibility. -->
-    <config name="testVersion" value="5.2-"/>
+    <config name="testVersion" value="5.6-"/>
     <rule ref="PHPCompatibilityWP"/>
 </ruleset>
diff --git a/readme.txt b/readme.txt
index 3cbc92e5..c027032b 100644
--- a/readme.txt
+++ b/readme.txt
@@ -2,9 +2,9 @@
 * Contributors:      pluginkollektiv
 * Donate link:       https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=TD4AMD2D8EMZW
 * Tags:              acceleration, cache, caching, minimize, performance, apc, disk, hdd, memcached, compression, minify, speed
-* Requires at least: 4.4
-* Tested up to:      5.8
-* Requires PHP:      5.2.4
+* Requires at least: 4.7
+* Tested up to:      5.9
+* Requires PHP:      5.6
 * Stable tag:        2.3.2
 * License:           GPLv2 or later
 * License URI:       http://www.gnu.org/licenses/gpl-2.0.html