diff --git a/composer.json b/composer.json
index c23891d6..44693fb4 100644
--- a/composer.json
+++ b/composer.json
@@ -6,9 +6,6 @@
     "license": "MIT",
     "config": {
         "sort-packages": true,
-        "allow-plugins": {
-            "cweagans/composer-patches": true
-        },
         "platform": {
             "php": "8.2"
         }
@@ -16,6 +13,12 @@
     "support": {
         "issues": "https://github.com/Icinga/icinga-php-thirdparty/issues"
     },
+    "repositories": [
+      {
+        "type": "git",
+        "url": "https://github.com/Icinga/zf1"
+      }
+    ],
     "require": {
         "php": ">=8.2",
         "ext-curl": "*",
@@ -29,13 +32,13 @@
         "clue/socks-react": "^1.4",
         "clue/stdio-react": "^2.6",
         "components/jquery": "3.7.*",
-        "cweagans/composer-patches": "~2.0",
         "dompdf/dompdf": "^3.1.4",
         "dragonmantank/cron-expression": "^3.6",
         "evenement/evenement": "^3.0.2",
         "ezyang/htmlpurifier": "^4.19",
         "guzzlehttp/guzzle": "^7.10",
         "guzzlehttp/psr7": "^2.8",
+        "icinga/zf1": "2.0.0-rc1",
         "jfcherng/php-diff": "^6.16.2",
         "parsedown/parsedown": "^1.8",
         "predis/predis": "^3.4",
@@ -55,7 +58,6 @@
         "react/promise-timer": "^1.11",
         "react/socket": "^1.17",
         "react/stream": "^1.4",
-        "shardj/zf1-future": "^1.24.4",
         "simshaun/recurr": "^5.0.3",
         "tedivm/jshrink": "^1.8.1",
         "wikimedia/less.php": "^3.2.1",
@@ -71,17 +73,5 @@
         "post-update-cmd": [
             "AssetLoader::update"
         ]
-    },
-    "extra": {
-        "composer-exit-on-patch-failure": true,
-        "patches": {
-            "shardj/zf1-future": [
-                {
-                    "description": "ZF1-Future: ZF backward compatibility",
-                    "url": "patches/shardj-zf1-future.patch",
-                    "depth": 1
-                }
-            ]
-        }
     }
 }
diff --git a/composer.lock b/composer.lock
index abb85a0d..5855eab5 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": "f8406dcb699e2ff3fdc6c77ab6d21c01",
+    "content-hash": "4e49858ca4f14ef7860b8969eda5288d",
     "packages": [
         {
             "name": "brick/math",
@@ -931,129 +931,6 @@
             },
             "time": "2023-09-22T01:43:46+00:00"
         },
-        {
-            "name": "cweagans/composer-configurable-plugin",
-            "version": "2.0.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/cweagans/composer-configurable-plugin.git",
-                "reference": "15433906511a108a1806710e988629fd24b89974"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/cweagans/composer-configurable-plugin/zipball/15433906511a108a1806710e988629fd24b89974",
-                "reference": "15433906511a108a1806710e988629fd24b89974",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=8.0.0"
-            },
-            "require-dev": {
-                "codeception/codeception": "~4.0",
-                "codeception/module-asserts": "^2.0",
-                "composer/composer": "~2.0",
-                "php-coveralls/php-coveralls": "~2.0",
-                "php-parallel-lint/php-parallel-lint": "^1.0.0",
-                "phpro/grumphp": "^1.8.0",
-                "sebastian/phpcpd": "^6.0",
-                "squizlabs/php_codesniffer": "^3.0"
-            },
-            "type": "library",
-            "autoload": {
-                "psr-4": {
-                    "cweagans\\Composer\\": "src"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Cameron Eagans",
-                    "email": "me@cweagans.net"
-                }
-            ],
-            "description": "Provides a lightweight configuration system for Composer plugins.",
-            "support": {
-                "issues": "https://github.com/cweagans/composer-configurable-plugin/issues",
-                "source": "https://github.com/cweagans/composer-configurable-plugin/tree/2.0.0"
-            },
-            "funding": [
-                {
-                    "url": "https://github.com/cweagans",
-                    "type": "github"
-                }
-            ],
-            "time": "2023-02-12T04:58:58+00:00"
-        },
-        {
-            "name": "cweagans/composer-patches",
-            "version": "2.0.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/cweagans/composer-patches.git",
-                "reference": "bfa6018a5f864653d9ed899b902ea72f858a2cf7"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/cweagans/composer-patches/zipball/bfa6018a5f864653d9ed899b902ea72f858a2cf7",
-                "reference": "bfa6018a5f864653d9ed899b902ea72f858a2cf7",
-                "shasum": ""
-            },
-            "require": {
-                "composer-plugin-api": "^2.0",
-                "cweagans/composer-configurable-plugin": "^2.0",
-                "ext-json": "*",
-                "php": ">=8.0.0"
-            },
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-                "codeception/module-asserts": "^2.0",
-                "codeception/module-cli": "^2.0",
-                "codeception/module-filesystem": "^2.0",
-                "composer/composer": "~2.0",
-                "php-coveralls/php-coveralls": "~2.0",
-                "php-parallel-lint/php-parallel-lint": "^1.0.0",
-                "phpro/grumphp": "^1.8.0",
-                "sebastian/phpcpd": "^6.0",
-                "squizlabs/php_codesniffer": "^4.0"
-            },
-            "type": "composer-plugin",
-            "extra": {
-                "_": "The following two lines ensure that composer-patches is loaded as early as possible.",
-                "class": "cweagans\\Composer\\Plugin\\Patches",
-                "plugin-modifies-downloads": true,
-                "plugin-modifies-install-path": true
-            },
-            "autoload": {
-                "psr-4": {
-                    "cweagans\\Composer\\": "src"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Cameron Eagans",
-                    "email": "me@cweagans.net"
-                }
-            ],
-            "description": "Provides a way to patch Composer packages.",
-            "support": {
-                "issues": "https://github.com/cweagans/composer-patches/issues",
-                "source": "https://github.com/cweagans/composer-patches/tree/2.0.0"
-            },
-            "funding": [
-                {
-                    "url": "https://github.com/cweagans",
-                    "type": "github"
-                }
-            ],
-            "time": "2025-10-30T23:44:22+00:00"
-        },
         {
             "name": "doctrine/collections",
             "version": "2.6.0",
@@ -1896,6 +1773,40 @@
             ],
             "time": "2025-08-23T21:21:41+00:00"
         },
+        {
+            "name": "icinga/zf1",
+            "version": "v2.0.0-rc1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/Icinga/zf1",
+                "reference": "ec1e99c14715049ca5993dd7fe74d18711e8e67b"
+            },
+            "require": {
+                "php": ">=8.2",
+                "symfony/polyfill-php83": "^1.30"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-0": {
+                    "Zend_": "library/"
+                }
+            },
+            "autoload-dev": {
+                "files": [
+                    "tests/phar-compat-aliases.php"
+                ],
+                "psr-0": {
+                    "Zend_": "tests/",
+                    "resources_": "tests/"
+                }
+            },
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "description": "Streamlined Zend Framework 1 fork reduced to the components used by Icinga Web and its ecosystem.",
+            "homepage": "https://github.com/Icinga/zf1",
+            "time": "2026-02-20T15:23:10+00:00"
+        },
         {
             "name": "jfcherng/php-color-output",
             "version": "3.0.0",
@@ -4125,71 +4036,6 @@
             },
             "time": "2026-02-21T17:12:03+00:00"
         },
-        {
-            "name": "shardj/zf1-future",
-            "version": "1.24.4",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/Shardj/zf1-future.git",
-                "reference": "3582cce4bcf2c820191be56cf17fdef0addf0771"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/Shardj/zf1-future/zipball/3582cce4bcf2c820191be56cf17fdef0addf0771",
-                "reference": "3582cce4bcf2c820191be56cf17fdef0addf0771",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=7.1",
-                "symfony/polyfill-ctype": "^1.30",
-                "symfony/polyfill-mbstring": "^1.30",
-                "symfony/polyfill-php81": "^1.30",
-                "symfony/polyfill-php83": "^1.30"
-            },
-            "replace": {
-                "zendframework/zendframework1": ">=1.12.20"
-            },
-            "require-dev": {
-                "friendsofphp/php-cs-fixer": "^3",
-                "php-parallel-lint/php-parallel-lint": "^1.3",
-                "phpstan/phpstan": "^1.4 || ^2.0",
-                "phpunit/phpunit": "^7|^8|^9",
-                "rector/rector": "0.12.19 || ^1.2 || ^2.0",
-                "yoast/phpunit-polyfills": "^2.0"
-            },
-            "suggest": {
-                "ext-mbstring": "Multibyte strings handling"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.12.x-dev"
-                }
-            },
-            "autoload": {
-                "psr-0": {
-                    "Zend_": "library/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "include-path": [
-                "library/"
-            ],
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "description": "Zend Framework 1. The aim is to keep ZF1 working with the latest PHP versions",
-            "homepage": "https://github.com/Shardj/zf1-future/",
-            "keywords": [
-                "ZF1",
-                "framework"
-            ],
-            "support": {
-                "issues": "https://github.com/Shardj/zf1-future/issues",
-                "source": "https://github.com/Shardj/zf1-future/tree/release-1.24.4"
-            },
-            "time": "2025-06-26T19:09:46+00:00"
-        },
         {
             "name": "simshaun/recurr",
             "version": "v5.0.3",
@@ -4467,171 +4313,6 @@
             ],
             "time": "2024-09-09T11:45:10+00:00"
         },
-        {
-            "name": "symfony/polyfill-mbstring",
-            "version": "v1.33.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/symfony/polyfill-mbstring.git",
-                "reference": "6d857f4d76bd4b343eac26d6b539585d2bc56493"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/6d857f4d76bd4b343eac26d6b539585d2bc56493",
-                "reference": "6d857f4d76bd4b343eac26d6b539585d2bc56493",
-                "shasum": ""
-            },
-            "require": {
-                "ext-iconv": "*",
-                "php": ">=7.2"
-            },
-            "provide": {
-                "ext-mbstring": "*"
-            },
-            "suggest": {
-                "ext-mbstring": "For best performance"
-            },
-            "type": "library",
-            "extra": {
-                "thanks": {
-                    "url": "https://github.com/symfony/polyfill",
-                    "name": "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/v1.33.0"
-            },
-            "funding": [
-                {
-                    "url": "https://symfony.com/sponsor",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/fabpot",
-                    "type": "github"
-                },
-                {
-                    "url": "https://github.com/nicolas-grekas",
-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
-                    "type": "tidelift"
-                }
-            ],
-            "time": "2024-12-23T08:48:59+00:00"
-        },
-        {
-            "name": "symfony/polyfill-php81",
-            "version": "v1.33.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/symfony/polyfill-php81.git",
-                "reference": "4a4cfc2d253c21a5ad0e53071df248ed48c6ce5c"
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-            "dist": {
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-                "url": "https://api.github.com/repos/symfony/polyfill-php81/zipball/4a4cfc2d253c21a5ad0e53071df248ed48c6ce5c",
-                "reference": "4a4cfc2d253c21a5ad0e53071df248ed48c6ce5c",
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-                "php": ">=7.2"
-            },
-            "type": "library",
-            "extra": {
-                "thanks": {
-                    "url": "https://github.com/symfony/polyfill",
-                    "name": "symfony/polyfill"
-                }
-            },
-            "autoload": {
-                "files": [
-                    "bootstrap.php"
-                ],
-                "psr-4": {
-                    "Symfony\\Polyfill\\Php81\\": ""
-                },
-                "classmap": [
-                    "Resources/stubs"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
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-                    "name": "Nicolas Grekas",
-                    "email": "p@tchwork.com"
-                },
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
-                }
-            ],
-            "description": "Symfony polyfill backporting some PHP 8.1+ features to lower PHP versions",
-            "homepage": "https://symfony.com",
-            "keywords": [
-                "compatibility",
-                "polyfill",
-                "portable",
-                "shim"
-            ],
-            "support": {
-                "source": "https://github.com/symfony/polyfill-php81/tree/v1.33.0"
-            },
-            "funding": [
-                {
-                    "url": "https://symfony.com/sponsor",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/fabpot",
-                    "type": "github"
-                },
-                {
-                    "url": "https://github.com/nicolas-grekas",
-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
-                    "type": "tidelift"
-                }
-            ],
-            "time": "2024-09-09T11:45:10+00:00"
-        },
         {
             "name": "symfony/polyfill-php83",
             "version": "v1.33.0",
@@ -5323,7 +5004,9 @@
     "packages-dev": [],
     "aliases": [],
     "minimum-stability": "stable",
-    "stability-flags": {},
+    "stability-flags": {
+        "icinga/zf1": 5
+    },
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
diff --git a/patches/shardj-zf1-future.patch b/patches/shardj-zf1-future.patch
deleted file mode 100644
index c144fb89..00000000
--- a/patches/shardj-zf1-future.patch
+++ /dev/null
@@ -1,22 +0,0 @@
---- a/library/Zend/Form/Element.php
-+++ b/library/Zend/Form/Element.php
-@@ -601,7 +601,7 @@ class Zend_Form_Element implements Zend_Validate_Interface
-      * @param  string $key
-      * @return void
-      */
--    protected function _filterValue(&$value, $key)
-+    protected function _filterValue(&$value, &$key)
-     {
-         foreach ($this->getFilters() as $filter) {
-             $value = $filter->filter($value);
-@@ -618,7 +618,9 @@ class Zend_Form_Element implements Zend_Validate_Interface
-         $valueFiltered = $this->_value;
- 
-         if ($this->isArray() && is_array($valueFiltered)) {
--            array_walk_recursive($valueFiltered, [$this, '_filterValue']);
-+            array_walk_recursive($valueFiltered, function (&$val, $key) {
-+                $this->_filterValue($val, $key);
-+            });
-         } else {
-             $this->_filterValue($valueFiltered, $valueFiltered);
-         }