diff --git a/CHANGELOG.md b/CHANGELOG.md
index d031bc1ad2..b743aa805f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,29 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com)
 and this project adheres to [Semantic Versioning](https://semver.org).
 
+## TBD - 2.2.0
+
+### Added
+
+- Nothing
+
+### Changed
+
+- Nothing
+
+### Deprecated
+
+- Nothing
+
+### Moved
+
+- Nothing
+
+### Fixed
+
+- Incorrect Reader CSV with BOM. [Issue #4028](https://github.com/PHPOffice/PhpSpreadsheet/issues/4028) [PR #4029](https://github.com/PHPOffice/PhpSpreadsheet/pull/4029)
+- POWER Null/Bool Args. [PR #4031](https://github.com/PHPOffice/PhpSpreadsheet/pull/4031) 
+
 ## 2024-05-11 - 2.1.0
 
 ### MINOR BREAKING CHANGE
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/Operations.php b/src/PhpSpreadsheet/Calculation/MathTrig/Operations.php
index 9c4a6f44a5..0eca549b96 100644
--- a/src/PhpSpreadsheet/Calculation/MathTrig/Operations.php
+++ b/src/PhpSpreadsheet/Calculation/MathTrig/Operations.php
@@ -52,14 +52,14 @@ public static function mod(mixed $dividend, mixed $divisor): array|string|float
      *
      * Computes x raised to the power y.
      *
-     * @param array|float|int|string $x Or can be an array of values
-     * @param array|float|int|string $y Or can be an array of values
+     * @param null|array|bool|float|int|string $x Or can be an array of values
+     * @param null|array|bool|float|int|string $y Or can be an array of values
      *
      * @return array|float|int|string The result, or a string containing an error
      *         If an array of numbers is passed as an argument, then the returned result will also be an array
      *            with the same dimensions
      */
-    public static function power(array|float|int|string $x, array|float|int|string $y): array|float|int|string
+    public static function power(null|array|bool|float|int|string $x, null|array|bool|float|int|string $y): array|float|int|string
     {
         if (is_array($x) || is_array($y)) {
             return self::evaluateArrayArguments([self::class, __FUNCTION__], $x, $y);
diff --git a/tests/data/Calculation/MathTrig/POWER.php b/tests/data/Calculation/MathTrig/POWER.php
index a89e202d2d..3cca923cd1 100644
--- a/tests/data/Calculation/MathTrig/POWER.php
+++ b/tests/data/Calculation/MathTrig/POWER.php
@@ -410,4 +410,9 @@
     ],
     ['#VALUE!', 'x', 2],
     ['#VALUE!', 2, 'x'],
+    'exponent is null' => [1, 2, null],
+    'base is null' => [0, null, 2],
+    'both null' => ['#NUM!', null, null],
+    'exponent is bool' => [2, 2, true],
+    'base is bool' => [0, false, 2],
 ];