diff --git a/htdocs/composer.json b/htdocs/composer.json
index 9377f0d..eca6b6a 100644
--- a/htdocs/composer.json
+++ b/htdocs/composer.json
@@ -1,5 +1,5 @@
 {
   "require": {
-    "johngrogg/ics-parser": "^2.1"
+    "johngrogg/ics-parser": "^3.1"
   }
 }
diff --git a/htdocs/composer.lock b/htdocs/composer.lock
index bedacc1..5e66890 100644
--- a/htdocs/composer.lock
+++ b/htdocs/composer.lock
@@ -68,79 +68,6 @@
         }
       ],
       "time": "2020-11-02T10:28:33+00:00"
-    },
-    {
-      "name": "symfony/polyfill-mbstring",
-      "version": "v1.27.0",
-      "source": {
-        "type": "git",
-        "url": "https://github.com/symfony/polyfill-mbstring.git",
-        "reference": "8ad114f6b39e2c98a8b0e3bd907732c207c2b534"
-      },
-      "dist": {
-        "type": "zip",
-        "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/8ad114f6b39e2c98a8b0e3bd907732c207c2b534",
-        "reference": "8ad114f6b39e2c98a8b0e3bd907732c207c2b534",
-        "shasum": ""
-      },
-      "require": {
-        "php": ">=7.1"
-      },
-      "provide": {
-        "ext-mbstring": "*"
-      },
-      "suggest": {
-        "ext-mbstring": "For best performance"
-      },
-      "type": "library",
-      "extra": {
-        "branch-alias": {
-          "dev-main": "1.27-dev"
-        },
-        "thanks": {
-          "name": "symfony/polyfill",
-          "url": "https://github.com/symfony/polyfill"
-        }
-      },
-      "autoload": {
-        "files": ["bootstrap.php"],
-        "psr-4": {
-          "Symfony\\Polyfill\\Mbstring\\": ""
-        }
-      },
-      "notification-url": "https://packagist.org/downloads/",
-      "license": ["MIT"],
-      "authors": [
-        {
-          "name": "Nicolas Grekas",
-          "email": "p@tchwork.com"
-        },
-        {
-          "name": "Symfony Community",
-          "homepage": "https://symfony.com/contributors"
-        }
-      ],
-      "description": "Symfony polyfill for the Mbstring extension",
-      "homepage": "https://symfony.com",
-      "keywords": ["compatibility", "mbstring", "polyfill", "portable", "shim"],
-      "support": {
-        "source": "https://github.com/symfony/polyfill-mbstring/tree/v1.27.0"
-      },
-      "funding": [
-        {
-          "url": "https://symfony.com/sponsor",
-          "type": "custom"
-        },
-        {
-          "url": "https://github.com/fabpot",
-          "type": "github"
-        },
-        {
-          "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
-          "type": "tidelift"
-        }
-      ],
-      "time": "2022-11-03T14:55:06+00:00"
     }
   ],
   "packages-dev": [],