diff --git a/composer.json b/composer.json
index 4acf9a448..fa4e9f94f 100644
--- a/composer.json
+++ b/composer.json
@@ -43,7 +43,7 @@
         "nettrine/migrations": "^v0.8",
         "nextras/mail-panel": "^v2.5",
         "php-http/guzzle7-adapter": "^1.0",
-        "phpoffice/phpspreadsheet": "^4.1",
+        "phpoffice/phpspreadsheet": "^5.2",
         "ramsey/uuid": "^4.2",
         "sentry/sentry": "^3.4",
         "skaut/dependent-select-box": "dev-master",
diff --git a/composer.lock b/composer.lock
index 156009a34..5c102cc75 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": "8b05a75157285681db08dd196f45a339",
+    "content-hash": "fe518491263d13479359660bdd7798e5",
     "packages": [
         {
             "name": "beberlei/assert",
@@ -6038,16 +6038,16 @@
         },
         {
             "name": "phpoffice/phpspreadsheet",
-            "version": "4.1.0",
+            "version": "5.2.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHPOffice/PhpSpreadsheet.git",
-                "reference": "6ff18c3a8df3a945492f75ce455d77f7ad55dd5c"
+                "reference": "3b8994b3aac4b61018bc04fc8c441f4fd68c18eb"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/PHPOffice/PhpSpreadsheet/zipball/6ff18c3a8df3a945492f75ce455d77f7ad55dd5c",
-                "reference": "6ff18c3a8df3a945492f75ce455d77f7ad55dd5c",
+                "url": "https://api.github.com/repos/PHPOffice/PhpSpreadsheet/zipball/3b8994b3aac4b61018bc04fc8c441f4fd68c18eb",
+                "reference": "3b8994b3aac4b61018bc04fc8c441f4fd68c18eb",
                 "shasum": ""
             },
             "require": {
@@ -6077,18 +6077,19 @@
                 "dealerdirect/phpcodesniffer-composer-installer": "dev-main",
                 "dompdf/dompdf": "^2.0 || ^3.0",
                 "friendsofphp/php-cs-fixer": "^3.2",
-                "mitoteam/jpgraph": "^10.3",
+                "mitoteam/jpgraph": "^10.5",
                 "mpdf/mpdf": "^8.1.1",
                 "phpcompatibility/php-compatibility": "^9.3",
-                "phpstan/phpstan": "^1.1",
-                "phpstan/phpstan-phpunit": "^1.0",
+                "phpstan/phpstan": "^1.1 || ^2.0",
+                "phpstan/phpstan-deprecation-rules": "^1.0 || ^2.0",
+                "phpstan/phpstan-phpunit": "^1.0 || ^2.0",
                 "phpunit/phpunit": "^10.5",
                 "squizlabs/php_codesniffer": "^3.7",
                 "tecnickcom/tcpdf": "^6.5"
             },
             "suggest": {
                 "dompdf/dompdf": "Option for rendering PDF with PDF Writer",
-                "ext-intl": "PHP Internationalization Functions",
+                "ext-intl": "PHP Internationalization Functions, regquired for NumberFormat Wizard",
                 "mitoteam/jpgraph": "Option for rendering charts, or including charts with PDF or HTML Writers",
                 "mpdf/mpdf": "Option for rendering PDF with PDF Writer",
                 "tecnickcom/tcpdf": "Option for rendering PDF with PDF Writer"
@@ -6137,9 +6138,9 @@
             ],
             "support": {
                 "issues": "https://github.com/PHPOffice/PhpSpreadsheet/issues",
-                "source": "https://github.com/PHPOffice/PhpSpreadsheet/tree/4.1.0"
+                "source": "https://github.com/PHPOffice/PhpSpreadsheet/tree/5.2.0"
             },
-            "time": "2025-03-02T06:52:24+00:00"
+            "time": "2025-10-26T15:54:22+00:00"
         },
         {
             "name": "phpoption/phpoption",
@@ -13576,9 +13577,9 @@
     "aliases": [],
     "minimum-stability": "dev",
     "stability-flags": {
+        "roave/security-advisories": 20,
         "skaut/dependent-select-box": 20,
-        "skaut/psr6-caching": 20,
-        "roave/security-advisories": 20
+        "skaut/psr6-caching": 20
     },
     "prefer-stable": true,
     "prefer-lowest": false,
@@ -13590,5 +13591,5 @@
     "platform-dev": {
         "ext-pdo": "*"
     },
-    "plugin-api-version": "2.3.0"
+    "plugin-api-version": "2.6.0"
 }