diff --git a/composer.json b/composer.json
index 14cee90d2..58dedb83e 100644
--- a/composer.json
+++ b/composer.json
@@ -49,7 +49,7 @@
     "psr/container": "^1.0",
     "psr/log": "^1.0",
     "slim/slim": "^3.8",
-    "smarty/smarty": "^2.6",
+    "smarty/smarty": "^3.1",
     "soundasleep/html2text": "~0.5",
     "symfony/options-resolver": "^3.4",
     "symfony/validator": "^3.4",
diff --git a/composer.lock b/composer.lock
index 61f8e6e6e..3332939e8 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "0fa8618fdedf5c3f5fda912e462883a5",
+    "content-hash": "109749bfcffd26501c6b8497348b8dc8",
     "packages": [
         {
             "name": "consolidation/annotated-command",
@@ -2999,32 +2999,34 @@
         },
         {
             "name": "smarty/smarty",
-            "version": "v2.6.31",
+            "version": "v3.1.39",
             "source": {
                 "type": "git",
                 "url": "https://github.com/smarty-php/smarty.git",
-                "reference": "4ab9757b492f08a38f68123a6e7c1df7110bbc49"
+                "reference": "e27da524f7bcd7361e3ea5cdfa99c4378a7b5419"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/smarty-php/smarty/zipball/4ab9757b492f08a38f68123a6e7c1df7110bbc49",
-                "reference": "4ab9757b492f08a38f68123a6e7c1df7110bbc49",
+                "url": "https://api.github.com/repos/smarty-php/smarty/zipball/e27da524f7bcd7361e3ea5cdfa99c4378a7b5419",
+                "reference": "e27da524f7bcd7361e3ea5cdfa99c4378a7b5419",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.2"
             },
+            "require-dev": {
+                "phpunit/phpunit": "^7.5 || ^6.5 || ^5.7 || ^4.8",
+                "smarty/smarty-lexer": "^3.1"
+            },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.6.x-dev"
+                    "dev-master": "3.1.x-dev"
                 }
             },
             "autoload": {
                 "classmap": [
-                    "libs/Smarty.class.php",
-                    "libs/Smarty_Compiler.class.php",
-                    "libs/Config_File.class.php"
+                    "libs/"
                 ]
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -3039,6 +3041,10 @@
                 {
                     "name": "Uwe Tews",
                     "email": "uwe.tews@googlemail.com"
+                },
+                {
+                    "name": "Rodney Rehm",
+                    "email": "rodney.rehm@medialize.de"
                 }
             ],
             "description": "Smarty - the compiling PHP template engine",
@@ -3046,7 +3052,7 @@
             "keywords": [
                 "templating"
             ],
-            "time": "2017-11-03T06:39:13+00:00"
+            "time": "2021-02-17T21:57:51+00:00"
         },
         {
             "name": "soundasleep/html2text",
@@ -8632,12 +8638,12 @@
             "version": "1.9.1",
             "source": {
                 "type": "git",
-                "url": "https://github.com/webmozart/assert.git",
+                "url": "https://github.com/webmozarts/assert.git",
                 "reference": "bafc69caeb4d49c39fd0779086c03a3738cbb389"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/assert/zipball/bafc69caeb4d49c39fd0779086c03a3738cbb389",
+                "url": "https://api.github.com/repos/webmozarts/assert/zipball/bafc69caeb4d49c39fd0779086c03a3738cbb389",
                 "reference": "bafc69caeb4d49c39fd0779086c03a3738cbb389",
                 "shasum": ""
             },