diff --git a/.phpcs.xml.dist b/.phpcs.xml.dist
index f5c1d6d0..05f7a06e 100644
--- a/.phpcs.xml.dist
+++ b/.phpcs.xml.dist
@@ -3,9 +3,6 @@
 
 	<rule ref="WordPress-Core">
 		<exclude name="Universal.Arrays.DisallowShortArraySyntax.Found" />
-
-		<!-- Remove once https://github.com/squizlabs/PHP_CodeSniffer/issues/3745 is fixed. -->
-		<exclude name="Generic.CodeAnalysis.UnusedFunctionParameter.FoundAfterLastUsed" />
 	</rule>
 	<rule ref="WordPress-Docs">
 		<!--
@@ -17,6 +14,7 @@
 	</rule>
 	<rule ref="WordPress-Extra" />
 
+	<config name="minimum_wp_version" value="6.3"/>
 	<rule ref="WordPress.WP.I18n">
 		<properties>
 			<property name="text_domain" value="syntax-highlighting-code-block" />
diff --git a/.wp-env.json b/.wp-env.json
new file mode 100644
index 00000000..a911368a
--- /dev/null
+++ b/.wp-env.json
@@ -0,0 +1,4 @@
+{
+  "core": null,
+  "plugins": [ "." ]
+}
diff --git a/Gruntfile.js b/Gruntfile.js
index 0585c74a..72dba166 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -48,6 +48,7 @@ module.exports = function (grunt) {
 
 			const paths = [
 				'syntax-highlighting-code-block.php',
+				'inc/*',
 				'language-names.php',
 				'editor-styles.css',
 				'style.css',
diff --git a/README.md b/README.md
index b2f59706..e33e714f 100644
--- a/README.md
+++ b/README.md
@@ -6,11 +6,11 @@ Extending the Code block with syntax highlighting rendered on the server, thus b
 
 **Contributors:** [westonruter](https://profiles.wordpress.org/westonruter), [allejo](https://profiles.wordpress.org/allejo)  
 **Tags:** [block](https://wordpress.org/plugins/tags/block), [code](https://wordpress.org/plugins/tags/code), [code syntax](https://wordpress.org/plugins/tags/code-syntax), [syntax highlight](https://wordpress.org/plugins/tags/syntax-highlight), [code highlighting](https://wordpress.org/plugins/tags/code-highlighting)  
-**Requires at least:** 5.6  
-**Tested up to:** 6.3  
+**Requires at least:** 6.3  
+**Tested up to:** 6.4  
 **Stable tag:** 1.4.0  
 **License:** [GPLv2 or later](http://www.gnu.org/licenses/gpl-2.0.html)  
-**Requires PHP:** 5.6
+**Requires PHP:** 7.4
 
 [![Continuous Integration](https://github.com/westonruter/syntax-highlighting-code-block/actions/workflows/ci.yaml/badge.svg)](https://github.com/westonruter/syntax-highlighting-code-block/actions/workflows/ci.yaml)
 [![Built with Grunt](https://gruntjs.com/cdn/builtwith.svg)](http://gruntjs.com)
diff --git a/composer.json b/composer.json
index 1646e818..bfab3e90 100644
--- a/composer.json
+++ b/composer.json
@@ -8,7 +8,6 @@
   },
   "require-dev": {
     "civicrm/composer-downloads-plugin": "3.0.1",
-    "dealerdirect/phpcodesniffer-composer-installer": "1.0.0",
     "phpcompatibility/php-compatibility": "9.3.5",
     "szepeviktor/phpstan-wordpress": "1.3.2",
     "wp-coding-standards/wpcs": "3.0.1"
diff --git a/composer.lock b/composer.lock
index 096f1f4d..f59382e6 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": "75be17fb0591d338af64b6e7762d3eb8",
+    "content-hash": "836d4a6c9edc3dad3c83b216c04d8a66",
     "packages": [
         {
             "name": "scrivo/highlight.php",
@@ -835,5 +835,5 @@
     "platform-overrides": {
         "php": "7.4"
     },
-    "plugin-api-version": "2.3.0"
+    "plugin-api-version": "2.2.0"
 }
diff --git a/inc/functions.php b/inc/functions.php
index 06df308c..2e1966d2 100644
--- a/inc/functions.php
+++ b/inc/functions.php
@@ -586,12 +586,13 @@ function escape( string $content ): string {
  */
 function get_transient_key( string $content, array $attributes, bool $is_feed, array $auto_detect_languages ): ?string {
 	$hash_input = wp_json_encode(
-		array_merge(
-			compact( 'content', 'attributes', 'is_feed', 'auto_detect_languages' ),
-			[
-				'version' => PLUGIN_VERSION,
-			]
-		)
+		[
+			'content'               => $content,
+			'attributes'            => $attributes,
+			'is_feed'               => $is_feed,
+			'auto_detect_languages' => $auto_detect_languages,
+			'version'               => PLUGIN_VERSION,
+		]
 	);
 	if ( ! is_string( $hash_input ) ) {
 		return null;
diff --git a/syntax-highlighting-code-block.php b/syntax-highlighting-code-block.php
index 9a60f85b..3cc60d1a 100644
--- a/syntax-highlighting-code-block.php
+++ b/syntax-highlighting-code-block.php
@@ -3,7 +3,7 @@
  * Plugin Name:  Syntax-highlighting Code Block (with Server-side Rendering)
  * Plugin URI:   https://github.com/westonruter/syntax-highlighting-code-block
  * Description:  Extending the Code block with syntax highlighting rendered on the server, thus being AMP-compatible and having faster frontend performance.
- * Version:      1.4.0
+ * Version:      1.5.0-alpha
  * Author:       Weston Ruter
  * Author URI:   https://weston.ruter.net/
  * License:      GPL2
@@ -16,7 +16,7 @@
 
 namespace Syntax_Highlighting_Code_Block;
 
-const PLUGIN_VERSION = '1.4.0';
+const PLUGIN_VERSION = '1.5.0-alpha';
 
 const PLUGIN_MAIN_FILE = __FILE__;