diff --git a/README.md b/README.md
index bceb1bb..f069d7d 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Statify Blacklist #
 * Contributors:      Stefan Kalscheuer
-* Requires at least: 4.4
+* Requires at least: 4.7
 * Tested up to:      4.9
 * Requires PHP:      5.5
 * Stable tag:        1.4.3
@@ -46,7 +46,7 @@ The plugin is capable of handling multisite installations.
 
 ### Requirements ###
 * PHP 5.5 or above
-* WordPress 4.4 or above
+* WordPress 4.7 or above
 * Statify plugin installed and activated (1.5.0 or above)
 
 ## Frequently Asked Questions ##
@@ -82,6 +82,9 @@ Because of this, an IP blacklist can only be applied while processing the reques
 
 ## Changelog ##
 
+### 1.5.0 / unreleased ###
+* Minimum required WordPress version is 4.7
+
 ### 1.4.3 / 09.01.2018 ###
 * Fix issues with multisite installation (#11)
 
diff --git a/composer.json b/composer.json
index be3a5d0..dc35535 100644
--- a/composer.json
+++ b/composer.json
@@ -1,6 +1,6 @@
 {
   "name": "stklcode/statify-blacklist",
-  "version": "1.4.3",
+  "version": "1.5.0-alpha",
   "description": "A blacklist extension for the famous Statify WordPress plugin",
   "keywords": [
     "wordpress",
diff --git a/inc/class-statifyblacklist-system.php b/inc/class-statifyblacklist-system.php
index a9160b1..66b822f 100644
--- a/inc/class-statifyblacklist-system.php
+++ b/inc/class-statifyblacklist-system.php
@@ -31,9 +31,6 @@ class StatifyBlacklist_System extends StatifyBlacklist {
 		if ( $network_wide && is_multisite() ) {
 			if ( function_exists( 'get_sites' ) ) {
 				$sites = get_sites();
-			} elseif ( function_exists( 'wp_get_sites' ) ) {
-				// @codingStandardsIgnoreLine Legacy support for WP < 4.6.
-				$sites = wp_get_sites();
 			} else {
 				return;
 			}
diff --git a/phpcs.xml b/phpcs.xml
index a40b6c5..ff901cc 100644
--- a/phpcs.xml
+++ b/phpcs.xml
@@ -10,7 +10,7 @@
 	<file>statify-blacklist.php</file>
 
 	<!-- Compliance with WordPress Coding Standard -->
-	<config name="minimum_supported_wp_version" value="4.4"/>
+	<config name="minimum_supported_wp_version" value="4.7"/>
 	<rule ref="WordPress">
 		<!-- The plugin uses switch_to_blog for multisite handling. -->
 		<exclude name="WordPress.VIP.RestrictedFunctions.switch_to_blog"/>