diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4bec2d4..2565d61 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## [1.16.1] - 2023-01-23
+
+### Changed
+- User query functionality to work with the changes of WordPress 5.9.
+- PHP 8.1 fixes for usort functions
+
 ## [1.16.0] - 2022-05-17
 
 ### Added
diff --git a/src/Search/QueryBuilder.php b/src/Search/QueryBuilder.php
index bb06cee..89ccad9 100644
--- a/src/Search/QueryBuilder.php
+++ b/src/Search/QueryBuilder.php
@@ -205,7 +205,7 @@ public function get_query() : array {
 
         // All minuses to the end of the line.
         usort( $return, function( $a, $b ) {
-            return ( substr( $a, 0, 1 ) === '-' );
+            return ( substr( $a, 0, 1 ) === '-' ) ? 1 : 0;
         });
 
         return array_merge(
@@ -733,7 +733,7 @@ protected function create_meta_query( array $query, string $operator = 'AND' ) :
                         $prefix = $wpdb->base_prefix;
 
                         // This is the place to convert the checks of whether the user belongs to a blog or not into RediPress style.
-                        if ( preg_match( "/^${prefix}(\d+?)_?capabilities$/", $clause['key'], $matches ) && $clause['compare'] === 'EXISTS' ) {
+                        if ( preg_match( "/^{$prefix}(\d+?)_?capabilities$/", $clause['key'], $matches ) && $clause['compare'] === 'EXISTS' ) {
                             $query = $this->create_meta_query([
                                 [
                                     'key'     => 'blogs',
@@ -847,7 +847,7 @@ protected function create_meta_clause( array $clause ) : ?string {
         $prefix = $wpdb->base_prefix;
 
         // Filter out capability queries as they are handled differently
-        if ( preg_match( "/^${prefix}(\d+?)_?capabilities$/", $clause['key'] ) ) {
+        if ( preg_match( "/^{$prefix}(\d+?)_?capabilities$/", $clause['key'] ) ) {
             return '';
         }