diff --git a/includes/admin/class-admin.php b/includes/admin/class-admin.php
index 91ff1609..dd5382f3 100644
--- a/includes/admin/class-admin.php
+++ b/includes/admin/class-admin.php
@@ -93,7 +93,6 @@ if ( ! class_exists( 'um\admin\Admin' ) ) {
 			$this->secure();
 		}
 
-
 		function init_variables() {
 			$this->role_meta = apply_filters(
 				'um_role_meta_map',
diff --git a/includes/common/class-init.php b/includes/common/class-init.php
index b33146f1..aa777765 100644
--- a/includes/common/class-init.php
+++ b/includes/common/class-init.php
@@ -23,6 +23,7 @@ if ( ! class_exists( 'um\common\Init' ) ) {
 			$this->cpt()->hooks();
 			$this->screen();
 			$this->secure()->hooks();
+			$this->site_health();
 		}
 
 		/**
@@ -60,5 +61,17 @@ if ( ! class_exists( 'um\common\Init' ) ) {
 			}
 			return UM()->classes['um\common\secure'];
 		}
+
+		/**
+		 * @since 2.6.8
+		 *
+		 * @return Site_Health
+		 */
+		public function site_health() {
+			if ( empty( UM()->classes['um\common\site_health'] ) ) {
+				UM()->classes['um\common\site_health'] = new Site_Health();
+			}
+			return UM()->classes['um\common\site_health'];
+		}
 	}
 }
diff --git a/includes/common/class-site-health.php b/includes/common/class-site-health.php
new file mode 100644
index 00000000..59892b33
--- /dev/null
+++ b/includes/common/class-site-health.php
@@ -0,0 +1,42 @@
+<?php
+namespace um\common;
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
+if ( ! class_exists( 'um\common\Site_Health' ) ) {
+
+	/**
+	 * Class Site_Health
+	 *
+	 * @package um\common
+	 *
+	 * @since 2.6.8
+	 */
+	class Site_Health {
+
+		/**
+		 * Site_Health constructor.
+		 *
+		 * @since 2.6.8
+		 */
+		public function __construct() {
+			add_filter( 'site_status_test_php_modules', array( $this, 'add_required_modules' ) );
+		}
+
+		/**
+		 * Extends required PHP libraries.
+		 *
+		 * @param array $modules
+		 *
+		 * @return array
+		 */
+		public function add_required_modules( $modules ) {
+			$modules['mbstring']['required'] = true;
+			$modules['exif']['required']     = true;
+			$modules['iconv']['required']    = true;
+			return $modules;
+		}
+	}
+}
diff --git a/includes/core/um-filters-fields.php b/includes/core/um-filters-fields.php
index e646f8cd..c51387da 100644
--- a/includes/core/um-filters-fields.php
+++ b/includes/core/um-filters-fields.php
@@ -706,7 +706,9 @@ function um_field_non_utf8_value( $value ) {
 	if ( function_exists( 'mb_detect_encoding' ) ) {
 		$encoding = mb_detect_encoding( $value, 'utf-8, iso-8859-1, ascii', true );
 		if ( strcasecmp( $encoding, 'UTF-8' ) !== 0 ) {
-			$value = iconv( $encoding, 'utf-8', $value );
+			if ( function_exists( 'iconv' ) ) {
+				$value = iconv( $encoding, 'utf-8', $value );
+			}
 		}
 	}
 
diff --git a/includes/core/um-filters-profile.php b/includes/core/um-filters-profile.php
index 34a7f3d7..95515724 100644
--- a/includes/core/um-filters-profile.php
+++ b/includes/core/um-filters-profile.php
@@ -62,7 +62,7 @@ function um_dynamic_user_profile_title( $title, $id = '' ) {
 		}
 	}
 
-	if ( ! function_exists( 'utf8_decode' ) ) {
+	if ( ! function_exists( 'mb_convert_encoding' ) ) {
 		return $title;
 	}
 
diff --git a/includes/core/um-filters-user.php b/includes/core/um-filters-user.php
index 4e96d492..6d8bfe8a 100644
--- a/includes/core/um-filters-user.php
+++ b/includes/core/um-filters-user.php
@@ -285,6 +285,7 @@ add_filter( 'um_clean_user_basename_filter', 'um_clean_user_basename_filter', 2,
  * @return array
  */
 function um_before_update_profile( $changes, $user_id ) {
+	// todo check if this option required and maybe there are some WordPress native ways how to make that without custom unused functions. Maybe fully deprecate 'um_force_utf8_strings' option which doesn't exist in UI.
 	if ( ! UM()->options()->get( 'um_force_utf8_strings' ) ) {
 		return $changes;
 	}
diff --git a/includes/um-short-functions.php b/includes/um-short-functions.php
index 0ec70389..72193f57 100644
--- a/includes/um-short-functions.php
+++ b/includes/um-short-functions.php
@@ -2662,9 +2662,13 @@ function um_force_utf8_string( $value ) {
 	if ( is_array( $value ) ) {
 		$arr_value = array();
 		foreach ( $value as $key => $v ) {
+			if ( ! function_exists( 'utf8_decode' ) ) {
+				continue;
+			}
+
 			$utf8_decoded_value = utf8_decode( $v );
 
-			if ( mb_check_encoding( $utf8_decoded_value, 'UTF-8' ) ) {
+			if ( function_exists( 'mb_check_encoding' ) && mb_check_encoding( $utf8_decoded_value, 'UTF-8' ) ) {
 				array_push( $arr_value, $utf8_decoded_value );
 			} else {
 				array_push( $arr_value, $v );
@@ -2674,11 +2678,12 @@ function um_force_utf8_string( $value ) {
 
 		return $arr_value;
 	} else {
+		if ( function_exists( 'utf8_decode' ) ) {
+			$utf8_decoded_value = utf8_decode( $value );
 
-		$utf8_decoded_value = utf8_decode( $value );
-
-		if (mb_check_encoding( $utf8_decoded_value, 'UTF-8' )) {
-			return $utf8_decoded_value;
+			if ( function_exists( 'mb_check_encoding' ) && mb_check_encoding( $utf8_decoded_value, 'UTF-8' ) ) {
+				return $utf8_decoded_value;
+			}
 		}
 	}
 
diff --git a/readme.txt b/readme.txt
index 460d4b37..8792cfe8 100644
--- a/readme.txt
+++ b/readme.txt
@@ -141,6 +141,10 @@ The plugin does not restrict access to the wp-login.php page when active, so tha
 
 No, you do not need to use our plugin’s login or registration pages and can use another plugin or the default WordPress methods for user registration and login.
 
+= Are additional PHP modules necessary for the plugin to work correctly? =
+
+No specific extensions are needed. But we highly recommended keep active these PHP modules: `mbstring`, `json`, `dom`, `exif`, `gd`, `fileinfo`, `curl`, `iconv`. wp-admin > Tools > Site Health page has a summary about your installation and required modules. All major extensions are listed [here](https://make.wordpress.org/hosting/handbook/server-environment/#php-extensions).
+
 == Screenshots ==
 
 1. Screenshot 1
@@ -162,6 +166,16 @@ No, you do not need to use our plugin’s login or registration pages and can us
 
 IMPORTANT: PLEASE UPDATE THE PLUGIN TO AT LEAST VERSION 2.6.7 IMMEDIATELY. VERSION 2.6.7 PATCHES SECURITY PRIVILEGE ESCALATION VULNERABILITY. PLEASE SEE [THIS ARTICLE](https://docs.ultimatemember.com/article/1866-security-incident-update-and-recommended-actions) FOR MORE INFORMATION
 
+= 2.6.8: July 12, 2023 =
+
+* Enhancements:
+
+  - Added: Secure settings. [Read more](https://docs.ultimatemember.com/article/1869-security-feature)
+
+* Bugfixes:
+
+  - Fixed: Using some specific functions which cannot exist if PHP modules are disabled
+
 = 2.6.7: July 1, 2023 =
 
 * Bugfixes: