diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8feb2dd..565f617 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,8 +9,13 @@ Exclamation symbols (:exclamation:) note something of importance e.g. breaking c
 ### Deprecated
 ### Removed
 ### Fixed
+### Security
+
+## [0.13.1] - 2022-05-27
+### Fixed
 - Trigger the release note for `released` action instead of `published`.
 ### Security
+- Require Guzzle 7.4.3 and up.
 
 ## [0.13.0] - 2022-03-24
 ### Added
@@ -109,6 +114,7 @@ Exclamation symbols (:exclamation:) note something of importance e.g. breaking c
 - Extended `.env.example` file.
 
 [Unreleased]: https://github.com/php-telegram-bot/support-bot/compare/master...develop
+[0.13.1]: https://github.com/php-telegram-bot/support-bot/compare/0.13.0...0.13.1
 [0.13.0]: https://github.com/php-telegram-bot/support-bot/compare/0.12.0...0.13.0
 [0.12.0]: https://github.com/php-telegram-bot/support-bot/compare/0.11.0...0.12.0
 [0.11.0]: https://github.com/php-telegram-bot/support-bot/compare/0.10.0...0.11.0
diff --git a/composer.json b/composer.json
index f926dd3..6a1c1c0 100644
--- a/composer.json
+++ b/composer.json
@@ -28,7 +28,7 @@
         "monolog/monolog": "^2.2",
         "matthiasmullie/scrapbook": "^1.4",
         "knplabs/github-api": "^3.3",
-        "guzzlehttp/guzzle": "^7.3",
+        "guzzlehttp/guzzle": "^7.4.3",
         "http-interop/http-factory-guzzle": "^1.0"
     },
     "require-dev": {
diff --git a/public/manager.php b/public/manager.php
index 9f0ec56..6c60f7a 100644
--- a/public/manager.php
+++ b/public/manager.php
@@ -28,7 +28,7 @@
 use TelegramBot\TelegramBotManager\BotManager;
 use Throwable;
 
-const VERSION = '0.13.0';
+const VERSION = '0.13.1';
 
 // Composer autoloader.
 require_once __DIR__ . '/../vendor/autoload.php';
@@ -38,11 +38,7 @@ function cache(): KeyValueStore
 {
     static $cache;
 
-    if (null === $cache) {
-        $cache = new MySQL(DB::getPdo());
-    }
-
-    return $cache;
+    return $cache ??= new MySQL(DB::getPdo());
 }
 
 try {
@@ -116,7 +112,7 @@ function initLogging(): void
 /**
  * Initialise a custom Request Client.
  */
-function initRequestClient()
+function initRequestClient(): void
 {
     $config = array_filter([
         'base_uri' => getenv('TG_REQUEST_CLIENT_BASE_URI') ?: 'https://api.telegram.org',