diff --git a/.github/workflows/composer-diff.yml b/.github/workflows/composer-diff.yml
index 295b538..439fd2f 100644
--- a/.github/workflows/composer-diff.yml
+++ b/.github/workflows/composer-diff.yml
@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0 # Required to make it possible to compare with PR base branch
 
diff --git a/composer.json b/composer.json
index fc2ccfd..a9c02bf 100644
--- a/composer.json
+++ b/composer.json
@@ -9,6 +9,7 @@
 			"email": "joost@joost.blog"
 		}
 	],
+	"minimum-stability": "dev",
 	"require-dev": {
 		"wp-coding-standards/wpcs": "^3.0",
 		"phpcompatibility/phpcompatibility-wp": "*",
@@ -16,7 +17,8 @@
 		"yoast/wp-test-utils": "^1.2",
 		"phpstan/phpstan": "^1.10",
 		"szepeviktor/phpstan-wordpress": "^1.3",
-		"phpstan/extension-installer": "^1.3"
+		"phpstan/extension-installer": "^1.3",
+		"phpcompatibility/php-compatibility": "dev-develop as 9.99.99"
 	},
 	"scripts": {
 		"check-cs": [
diff --git a/composer.lock b/composer.lock
index 80d24e7..d145e72 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": "83dd704a45546944c17b923f0fc59fea",
+    "content-hash": "005df9e8bb8ad210ae6ac2a8a7304864",
     "packages": [],
     "packages-dev": [
         {
@@ -752,33 +752,45 @@
         },
         {
             "name": "phpcompatibility/php-compatibility",
-            "version": "9.3.5",
+            "version": "dev-develop",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHPCompatibility/PHPCompatibility.git",
-                "reference": "9fb324479acf6f39452e0655d2429cc0d3914243"
+                "reference": "40ae925146dfb8e0b9aa04b0d979e64c369fe9f4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/PHPCompatibility/PHPCompatibility/zipball/9fb324479acf6f39452e0655d2429cc0d3914243",
-                "reference": "9fb324479acf6f39452e0655d2429cc0d3914243",
+                "url": "https://api.github.com/repos/PHPCompatibility/PHPCompatibility/zipball/40ae925146dfb8e0b9aa04b0d979e64c369fe9f4",
+                "reference": "40ae925146dfb8e0b9aa04b0d979e64c369fe9f4",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3",
-                "squizlabs/php_codesniffer": "^2.3 || ^3.0.2"
+                "php": ">=5.4",
+                "phpcsstandards/phpcsutils": "^1.0.9",
+                "squizlabs/php_codesniffer": "^3.9.0"
             },
-            "conflict": {
-                "squizlabs/php_codesniffer": "2.6.2"
+            "replace": {
+                "wimg/php-compatibility": "*"
             },
             "require-dev": {
-                "phpunit/phpunit": "~4.5 || ^5.0 || ^6.0 || ^7.0"
+                "php-parallel-lint/php-console-highlighter": "^1.0.0",
+                "php-parallel-lint/php-parallel-lint": "^1.3.2",
+                "phpcsstandards/phpcsdevcs": "^1.1.3",
+                "phpcsstandards/phpcsdevtools": "^1.2.0",
+                "phpunit/phpunit": "^4.8.36 || ^5.7.21 || ^6.0 || ^7.0 || ^8.0 || ^9.3.4 || ^10.1.0",
+                "yoast/phpunit-polyfills": "^1.0.5 || ^2.0.0"
             },
             "suggest": {
-                "dealerdirect/phpcodesniffer-composer-installer": "^0.5 || This Composer plugin will sort out the PHPCS 'installed_paths' automatically.",
                 "roave/security-advisories": "dev-master || Helps prevent installing dependencies with known security issues."
             },
+            "default-branch": true,
             "type": "phpcodesniffer-standard",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "9.x-dev",
+                    "dev-develop": "10.x-dev"
+                }
+            },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
                 "LGPL-3.0-or-later"
@@ -804,13 +816,29 @@
             "keywords": [
                 "compatibility",
                 "phpcs",
-                "standards"
+                "standards",
+                "static analysis"
             ],
             "support": {
                 "issues": "https://github.com/PHPCompatibility/PHPCompatibility/issues",
+                "security": "https://github.com/PHPCompatibility/PHPCompatibility/security/policy",
                 "source": "https://github.com/PHPCompatibility/PHPCompatibility"
             },
-            "time": "2019-12-27T09:44:58+00:00"
+            "funding": [
+                {
+                    "url": "https://github.com/PHPCompatibility",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/jrfnl",
+                    "type": "github"
+                },
+                {
+                    "url": "https://opencollective.com/php_codesniffer",
+                    "type": "open_collective"
+                }
+            ],
+            "time": "2024-04-21T00:45:58+00:00"
         },
         {
             "name": "phpcompatibility/phpcompatibility-paragonie",
@@ -3045,9 +3073,18 @@
             "time": "2023-09-27T10:25:08+00:00"
         }
     ],
-    "aliases": [],
-    "minimum-stability": "stable",
-    "stability-flags": [],
+    "aliases": [
+        {
+            "package": "phpcompatibility/php-compatibility",
+            "version": "dev-develop",
+            "alias": "9.99.99",
+            "alias_normalized": "9.99.99.0"
+        }
+    ],
+    "minimum-stability": "dev",
+    "stability-flags": {
+        "phpcompatibility/php-compatibility": 20
+    },
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": [],
diff --git a/src/class-admin.php b/src/class-admin.php
index 6833464..a6c7474 100644
--- a/src/class-admin.php
+++ b/src/class-admin.php
@@ -20,10 +20,10 @@ class Admin {
 	 * @return void
 	 */
 	public function register_hooks() {
-		add_action( 'admin_init', [ $this, 'register_settings' ] );
-		add_filter( 'manage_edit-post_tag_columns', [ $this, 'add_tag_columns' ] );
-		add_filter( 'manage_post_tag_custom_column', [ $this, 'manage_tag_columns' ], 10, 3 );
-		add_filter( 'tag_row_actions', [ $this, 'remove_view_action' ], 10, 2 );
+		\add_action( 'admin_init', [ $this, 'register_settings' ] );
+		\add_filter( 'manage_edit-post_tag_columns', [ $this, 'add_tag_columns' ] );
+		\add_filter( 'manage_post_tag_custom_column', [ $this, 'manage_tag_columns' ], 10, 3 );
+		\add_filter( 'tag_row_actions', [ $this, 'remove_view_action' ], 10, 2 );
 	}
 
 	/**
@@ -32,14 +32,14 @@ public function register_hooks() {
 	 * @return void
 	 */
 	public function register_settings() {
-		add_settings_section(
+		\add_settings_section(
 			'fewer_tags_section',
 			__( 'Fewer Tags settings', 'fewer-tags' ),
 			[ $this, 'display_section' ],
 			'reading'
 		);
 
-		add_settings_field(
+		\add_settings_field(
 			Plugin::$option_name,
 			__( 'Tags need to have', 'fewer-tags' ),
 			[ $this, 'display_setting' ],
@@ -47,7 +47,7 @@ public function register_settings() {
 			'fewer_tags_section'
 		);
 
-		register_setting( 'reading', Plugin::$option_name );
+		\register_setting( 'reading', Plugin::$option_name );
 	}
 
 	/**
@@ -56,7 +56,7 @@ public function register_settings() {
 	 * @return void
 	 */
 	public function display_section() {
-		esc_html_e( 'Set the minimum number of posts a tag should have to become live on the site and not be redirected to the homepage.', 'fewer-tags' );
+		\esc_html_e( 'Set the minimum number of posts a tag should have to become live on the site and not be redirected to the homepage.', 'fewer-tags' );
 	}
 
 	/**
@@ -67,14 +67,14 @@ public function display_section() {
 	public function display_setting() {
 		?>
 		<input
-			name="<?php echo esc_attr( Plugin::$option_name ); ?>"
-			id="<?php echo esc_attr( Plugin::$option_name ); ?>"
+			name="<?php echo \esc_attr( Plugin::$option_name ); ?>"
+			id="<?php echo \esc_attr( Plugin::$option_name ); ?>"
 			type="number"
 			min="1"
 			value="<?php echo (int) Plugin::$min_posts_count; ?>"
 			class="small-text"
 		/>
-		<?php esc_html_e( 'posts before being live on the site.', 'fewer-tags' ); ?>
+		<?php \esc_html_e( 'posts before being live on the site.', 'fewer-tags' ); ?>
 		<?php
 	}
 
@@ -101,10 +101,10 @@ public function add_tag_columns( $columns ) {
 	 */
 	public function manage_tag_columns( $out, $column_name, $tag_ID ) {
 		if ( $column_name === 'active' ) {
-			$term = get_term( $tag_ID );
-			$out  = esc_html__( 'Live', 'fewer-tags' );
+			$term = \get_term( $tag_ID );
+			$out  = \esc_html__( 'Live', 'fewer-tags' );
 			if ( $term->count < \FewerTags\Plugin::$min_posts_count ) {
-				$out = '<span title="' . esc_html__( 'Not live due to not enough posts being in this tag.', 'fewer-tags' ) . '">' . esc_html__( 'Not live', 'fewer-tags' ) . '</span>';
+				$out = '<span title="' . \esc_html__( 'Not live due to not enough posts being in this tag.', 'fewer-tags' ) . '">' . \esc_html__( 'Not live', 'fewer-tags' ) . '</span>';
 			}
 		}
 
diff --git a/src/class-frontend.php b/src/class-frontend.php
index 0f55495..0a73c3e 100644
--- a/src/class-frontend.php
+++ b/src/class-frontend.php
@@ -18,11 +18,11 @@ class Frontend {
 	 * @return void
 	 */
 	public function register_hooks() {
-		add_action( 'template_redirect', [ $this, 'redirect_tag_pages' ] );
-		add_filter( 'get_the_tags', [ $this, 'filter_get_the_tags' ] );
-		add_filter( 'get_the_terms', [ $this, 'filter_get_the_terms' ], 10, 3 );
-		add_filter( 'wpseo_exclude_from_sitemap_by_term_ids', [ $this, 'exclude_tags_from_yoast_sitemap' ] );
-		add_filter( 'wp_sitemaps_taxonomies_query_args', [ $this, 'exclude_tags_from_core_sitemap' ], 10, 2 );
+		\add_action( 'template_redirect', [ $this, 'redirect_tag_pages' ] );
+		\add_filter( 'get_the_tags', [ $this, 'filter_get_the_tags' ] );
+		\add_filter( 'get_the_terms', [ $this, 'filter_get_the_terms' ], 10, 3 );
+		\add_filter( 'wpseo_exclude_from_sitemap_by_term_ids', [ $this, 'exclude_tags_from_yoast_sitemap' ] );
+		\add_filter( 'wp_sitemaps_taxonomies_query_args', [ $this, 'exclude_tags_from_core_sitemap' ], 10, 2 );
 	}
 
 	/**
@@ -31,10 +31,10 @@ public function register_hooks() {
 	 * @return void
 	 */
 	public function redirect_tag_pages() {
-		if ( is_tag() ) {
-			$tag = get_queried_object();
+		if ( \is_tag() ) {
+			$tag = \get_queried_object();
 			if ( $tag && $tag->count < \FewerTags\Plugin::$min_posts_count ) {
-				wp_safe_redirect( home_url(), 301 );
+				\wp_safe_redirect( \home_url(), 301 );
 				// @codeCoverageIgnoreStart
 				exit;
 				// @codeCoverageIgnoreEnd
@@ -58,7 +58,7 @@ public function filter_get_the_terms( $terms, $post_id, $taxonomy ) {
 			return $terms;
 		}
 
-		if ( is_array( $terms ) ) {
+		if ( \is_array( $terms ) ) {
 			foreach ( $terms as $key => $tag ) {
 				if ( $tag->count < \FewerTags\Plugin::$min_posts_count ) {
 					unset( $terms[ $key ] );
@@ -77,7 +77,7 @@ public function filter_get_the_terms( $terms, $post_id, $taxonomy ) {
 	 * @return array The filtered array of tag objects.
 	 */
 	public function filter_get_the_tags( $tags ) {
-		if ( is_array( $tags ) ) {
+		if ( \is_array( $tags ) ) {
 			foreach ( $tags as $key => $tag ) {
 				if ( $tag->count < \FewerTags\Plugin::$min_posts_count ) {
 					unset( $tags[ $key ] );
@@ -106,7 +106,7 @@ public function exclude_tags_from_core_sitemap( $args, $taxonomy ) {
 		}
 
 		// exclude terms with too few posts.
-		$args['exclude'] = array_merge( $args['exclude'], $this->get_tag_ids_with_fewer_than_min_posts() );
+		$args['exclude'] = \array_merge( $args['exclude'], $this->get_tag_ids_with_fewer_than_min_posts() );
 		return $args;
 	}