diff --git a/composer.json b/composer.json
index 48fa2181f..e1d917044 100644
--- a/composer.json
+++ b/composer.json
@@ -52,7 +52,7 @@
         "ublaboo/mailing": "^1.2",
 
         "jms/serializer": "^3.28",
-        "phpoffice/phpspreadsheet": "^2.0",
+        "phpoffice/phpspreadsheet": "^3.3",
         "contributte/pdf": "^7.0",
         "mpdf/qrcode": "^1.2",
         "dfridrich/qr-platba": "^2.0",
diff --git a/composer.lock b/composer.lock
index 012e2a067..027668037 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": "3a243ddd4d044dfbb812adb1878a787b",
+    "content-hash": "5af0bacbea7d3c5e64a368b28aa6eb92",
     "packages": [
         {
             "name": "azuyalabs/yasumi",
@@ -5563,16 +5563,16 @@
         },
         {
             "name": "phpoffice/phpspreadsheet",
-            "version": "2.3.0",
+            "version": "3.3.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHPOffice/PhpSpreadsheet.git",
-                "reference": "c972c146ddd5e8350ea839355b9bb0ce6a8fa33e"
+                "reference": "87ddd21eb0b6b7ad20a11d314348ef307475f547"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/PHPOffice/PhpSpreadsheet/zipball/c972c146ddd5e8350ea839355b9bb0ce6a8fa33e",
-                "reference": "c972c146ddd5e8350ea839355b9bb0ce6a8fa33e",
+                "url": "https://api.github.com/repos/PHPOffice/PhpSpreadsheet/zipball/87ddd21eb0b6b7ad20a11d314348ef307475f547",
+                "reference": "87ddd21eb0b6b7ad20a11d314348ef307475f547",
                 "shasum": ""
             },
             "require": {
@@ -5661,9 +5661,9 @@
             ],
             "support": {
                 "issues": "https://github.com/PHPOffice/PhpSpreadsheet/issues",
-                "source": "https://github.com/PHPOffice/PhpSpreadsheet/tree/2.3.0"
+                "source": "https://github.com/PHPOffice/PhpSpreadsheet/tree/3.3.0"
             },
-            "time": "2024-09-29T07:06:02+00:00"
+            "time": "2024-09-29T07:04:07+00:00"
         },
         {
             "name": "phpstan/phpdoc-parser",
@@ -12855,10 +12855,10 @@
     "aliases": [],
     "minimum-stability": "stable",
     "stability-flags": {
-        "roave/security-advisories": 20,
-        "skautis/nette": 15,
+        "vojtys/nette-forms-gpspicker": 20,
         "skautis/skautis": 15,
-        "vojtys/nette-forms-gpspicker": 20
+        "skautis/nette": 15,
+        "roave/security-advisories": 20
     },
     "prefer-stable": false,
     "prefer-lowest": false,
@@ -12872,6 +12872,6 @@
         "ext-mysqli": "*",
         "ext-soap": "*"
     },
-    "platform-dev": {},
+    "platform-dev": [],
     "plugin-api-version": "2.6.0"
 }