diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4a4c7ab..41af545 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,8 @@ See [keep a changelog] for information about writing changes to this log.
 
 ## [Unreleased]
 
+- [PR-78](https://github.com/itk-dev/event-database-api/pull/78)
+  Add PHPStan deprecation rules (ignore the API Platform 4.4 `#[ApiFilter]` deprecations)
 - [PR-77](https://github.com/itk-dev/event-database-api/pull/77)
   Update Symfony Flex recipes
 - [PR-76](https://github.com/itk-dev/event-database-api/pull/76)
diff --git a/composer.json b/composer.json
index 390b0d0..c665983 100644
--- a/composer.json
+++ b/composer.json
@@ -45,6 +45,7 @@
         "pb30/phpstan-composer-analysis": "^1.1",
         "phpstan/extension-installer": "^1.4",
         "phpstan/phpstan": "^2.1",
+        "phpstan/phpstan-deprecation-rules": "^2.0",
         "phpstan/phpstan-strict-rules": "^2.0",
         "phpstan/phpstan-symfony": "^2.0",
         "phpunit/phpunit": "^13",
diff --git a/composer.lock b/composer.lock
index f60651e..a22f967 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": "0b8b0e658b7dce17f6848b7f79e34c48",
+    "content-hash": "9191b2f4b520ad3382f47d428fa5f251",
     "packages": [
         {
             "name": "api-platform/core",
@@ -8183,6 +8183,58 @@
             "time": "2026-10-28T22:38:53+00:00",
             "published-time": "2026-10-28T22:39:06+00:00"
         },
+        {
+            "name": "phpstan/phpstan-deprecation-rules",
+            "version": "2.0.5",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpstan/phpstan-deprecation-rules.git",
+                "reference": "67bedd65c24bc72840afc45aed48b1059dd44bec"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpstan/phpstan-deprecation-rules/zipball/67bedd65c24bc72840afc45aed48b1059dd44bec",
+                "reference": "67bedd65c24bc72840afc45aed48b1059dd44bec",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.4 || ^8.0",
+                "phpstan/phpstan": "^2.1.39"
+            },
+            "require-dev": {
+                "php-parallel-lint/php-parallel-lint": "^1.2",
+                "phpstan/phpstan-phpunit": "^2.0",
+                "phpunit/phpunit": "^9.6",
+                "shipmonk/name-collision-detector": "^2.1"
+            },
+            "type": "phpstan-extension",
+            "extra": {
+                "phpstan": {
+                    "includes": [
+                        "rules.neon"
+                    ]
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "PHPStan\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "PHPStan rules for detecting usage of deprecated classes, methods, properties, constants and traits.",
+            "keywords": [
+                "static analysis"
+            ],
+            "support": {
+                "issues": "https://github.com/phpstan/phpstan-deprecation-rules/issues",
+                "source": "https://github.com/phpstan/phpstan-deprecation-rules/tree/2.0.5"
+            },
+            "time": "2026-07-22T06:50:43+00:00",
+            "published-time": "2026-07-27T15:18:00+00:00"
+        },
         {
             "name": "phpstan/phpstan-strict-rules",
             "version": "2.1.0",
diff --git a/phpstan.dist.neon b/phpstan.dist.neon
index d48207b..0ec6d37 100644
--- a/phpstan.dist.neon
+++ b/phpstan.dist.neon
@@ -17,6 +17,13 @@ parameters:
         - identifier: missingType.iterableValue
         # The ID properties are set reflectively by API Platform.
         - '#Property App\\Api\\Dto\\[^\\]+::\$id is unused#'
+        # API Platform 4.4 deprecates #[ApiFilter] and replaces it with #[QueryParameter]. #[ApiFilter] is removed
+        # in API Platform 6.0. The change needs application code changes (the DTOs, and AbstractProvider::getFilters(),
+        # which reads the #[ApiFilter] attributes through api_platform.filter_locator). Remove this rule after the change.
+        -
+            identifier: attribute.deprecated
+            message: '#^Attribute class ApiPlatform\\Metadata\\ApiFilter is deprecated#'
+            path: src/Api/Dto/*
     # pb30/phpstan-composer-analysis: report packages used directly but only installed transitively ("shadow
     # dependencies") and dev packages used in production code. Unused/misplaced checks are off: bundles and
     # extensions are used through config, not class references, so they would all be false positives.