diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1923781fc..a99257c23 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [3.1.40] - 2021-10-13
+
 ### Changed
 - modifier escape now triggers a E_USER_NOTICE when an unsupported escape type is used https://github.com/smarty-php/smarty/pull/649
 
diff --git a/libs/Smarty.class.php b/libs/Smarty.class.php
index 375bab133..daa677498 100644
--- a/libs/Smarty.class.php
+++ b/libs/Smarty.class.php
@@ -111,7 +111,7 @@ class Smarty extends Smarty_Internal_TemplateBase
     /**
      * smarty version
      */
-    const SMARTY_VERSION = '3.1.39';
+    const SMARTY_VERSION = '3.1.40';
     /**
      * define variable scopes
      */