diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 21977687..e27b60bf 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -37,6 +37,9 @@ jobs:
           - os: ubuntu-latest
             php-version: "8.0"
             compiler: jit
+          - os: ubuntu-latest
+            php-version: "8.1"
+            compiler: jit
 
     steps:
     - name: Checkout
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f5d51ec5..695c17f8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 -  PHP 8.1 deprecation notices in demo/plugins/cacheresource.pdo.php [#706](https://github.com/smarty-php/smarty/issues/706)
 
+## [4.1.0] - 2022-02-06
+
 ### Added
 - PHP8.1 compatibility [#713](https://github.com/smarty-php/smarty/pull/713)
 
diff --git a/README.md b/README.md
index 404ef673..782f0b2c 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ Smarty is a template engine for PHP, facilitating the separation of presentation
 Read the [documentation](https://smarty-php.github.io/smarty/) to find out how to use it. 
 
 ## Requirements
-Smarty can be run with PHP 7.1 to PHP 8.0.
+Smarty can be run with PHP 7.1 to PHP 8.1.
 
 ## Installation
 Smarty versions 3.1.11 or later can be installed with [Composer](https://getcomposer.org/).
diff --git a/docs/getting-started.md b/docs/getting-started.md
index cd21b96a..de55ffe8 100644
--- a/docs/getting-started.md
+++ b/docs/getting-started.md
@@ -2,7 +2,7 @@ What is Smarty?
 ==============
 
 ## Requirements
-Smarty can be run with PHP 7.1 to PHP 8.0.
+Smarty can be run with PHP 7.1 to PHP 8.1.
 
 ## Installation
 Smarty versions 3.1.11 or later can be installed with [Composer](https://getcomposer.org/).
diff --git a/libs/Smarty.class.php b/libs/Smarty.class.php
index 2058524e..0abbe6a7 100644
--- a/libs/Smarty.class.php
+++ b/libs/Smarty.class.php
@@ -98,7 +98,7 @@ class Smarty extends Smarty_Internal_TemplateBase
     /**
      * smarty version
      */
-    const SMARTY_VERSION = '4.0.4';
+    const SMARTY_VERSION = '4.1.0';
     /**
      * define variable scopes
      */
diff --git a/libs/plugins/function.math.php b/libs/plugins/function.math.php
index fd5b3d16..8560e944 100644
--- a/libs/plugins/function.math.php
+++ b/libs/plugins/function.math.php
@@ -69,7 +69,7 @@ function smarty_function_math($params, $template)
     // Adapted from https://www.php.net/manual/en/function.eval.php#107377
     $number = '(?:\d+(?:[,.]\d+)?|pi|π)'; // What is a number
     $functionsOrVars = '((?:0x[a-fA-F0-9]+)|([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*))';
-    $operators = '[+\/*\^%-]'; // Allowed math operators
+    $operators = '[,+\/*\^%-]'; // Allowed math operators
     $regexp = '/^(('.$number.'|'.$functionsOrVars.'|('.$functionsOrVars.'\s*\((?1)+\)|\((?1)+\)))(?:'.$operators.'(?1))?)+$/';
 
     if (!preg_match($regexp, $equation)) {
diff --git a/tests/UnitTests/TemplateSource/ValueTests/Math/MathTest.php b/tests/UnitTests/TemplateSource/ValueTests/Math/MathTest.php
index 645c0a40..82255644 100644
--- a/tests/UnitTests/TemplateSource/ValueTests/Math/MathTest.php
+++ b/tests/UnitTests/TemplateSource/ValueTests/Math/MathTest.php
@@ -52,6 +52,22 @@ class MathTest extends PHPUnit_Smarty
         $this->assertEquals($expected, $this->smarty->fetch($tpl));
     }
 
+    public function testMathMaxFunctionParameters()
+    {
+        $this->smarty->disableSecurity();
+        $expected = max(0, 2) . ' -- ' . max(0, 2, 3);
+        $tpl = $this->smarty->createTemplate('eval:{$x = 0}{$y = 2}{$z = 3}{math equation="max(x, y)" x=$x y=$y} -- {math equation="max(x, y, z)" x=$x y=$y z=$z}');
+        $this->assertEquals($expected, $this->smarty->fetch($tpl));
+    }
+
+    public function testMathMinFunctionParameters()
+    {
+        $this->smarty->disableSecurity();
+        $expected = min(1, 2) . ' -- ' . min(1, 2, 0);
+        $tpl = $this->smarty->createTemplate('eval:{$x = 1}{$y = 2}{$z = 0}{math equation="min(x, y)" x=$x y=$y} -- {math equation="min(x, y, z)" x=$x y=$y z=$z}');
+        $this->assertEquals($expected, $this->smarty->fetch($tpl));
+    }
+
     public function testSyntaxSin()
     {
         $this->smarty->disableSecurity();