diff --git a/.github/workflows/code-quality.yml b/.github/workflows/code-quality.yml
index 803ec21..6b76966 100644
--- a/.github/workflows/code-quality.yml
+++ b/.github/workflows/code-quality.yml
@@ -6,7 +6,6 @@ on:
   pull_request: ~
 
 env:
-  PHP_VERSION: 8.1
   APPLICATION_NAME: antifraud
   GCP_PROJECT_ID: liniopay-sandbox
   GCP_REGION: us-east4
@@ -16,9 +15,13 @@ env:
   NEW_RELIC_APP_NAME: ${{ secrets.NEW_RELIC_APP_NAME }}
 
 jobs:
-  test-php-81:
-    name: Code quality PHP 8.1
+  test-php:
+    name: Code quality PHP ${{ matrix.php-version }}
     runs-on: [ubuntu-latest]
+    strategy:
+      fail-fast: false
+      matrix:
+        php-version: ['8.2.35', '8.3.36', '8.4.27', '8.5.12']
     steps:
       - name: Checkout
         uses: actions/checkout@v2      
@@ -26,7 +29,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: 8.1
+          php-version: ${{ matrix.php-version }}
           coverage: xdebug
 
       - name: Validate composer.json and composer.lock
@@ -36,6 +39,7 @@ jobs:
         run: composer install --prefer-dist --no-progress
 
       - name: Lint
+        if: matrix.php-version == '8.2.35'
         run: composer lint:check
 
       - name: PHP Static Analysis
diff --git a/.php-cs-fixer.php b/.php-cs-fixer.php
index 01b8792..7527252 100644
--- a/.php-cs-fixer.php
+++ b/.php-cs-fixer.php
@@ -10,8 +10,8 @@
 $config
     ->setRules([
         '@Symfony' => true,
-        '@PHP81Migration' => true,
-        '@PHPUnit60Migration:risky' => true,
+        '@PHP8x1Migration' => true,
+        '@PHPUnit6x0Migration:risky' => true,
         'array_indentation' => true,
         'array_syntax' => ['syntax' => 'short'],
         'blank_line_after_opening_tag' => true,
diff --git a/.travis.yml b/.travis.yml
index 7840d3d..1372cce 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,10 @@
 language: php
 
 php:
-  - 8.1
+  - '8.2.35'
+  - '8.3.36'
+  - '8.4.27'
+  - '8.5.12'
 
 cache:
   directories:
diff --git a/README.md b/README.md
index 69f42a5..0f7857e 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,35 @@ a coherent base for Linio components:
 
 ## Install
 
+### PHP requirements
+
+Supported PHP branches and minimum patch versions are:
+
+| PHP branch | Minimum version |
+| --- | --- |
+| 8.2 | 8.2.35 |
+| 8.3 | 8.3.36 |
+| 8.4 | 8.4.27 |
+| 8.5 | 8.5.12 |
+
+Later patch releases within these branches are supported and recommended. PHP 8.1
+and older, earlier patches, and unlisted branches are not supported.
+
+These minimum versions contain the fixes for CVE-2026-109618 and CVE-2026-109619
+described in the [PHP security advisory of October 21, 2026](https://www.php.net/archive/2026.php#2026-10-21-5).
+The vulnerabilities are in the PHP runtime, not in this library. Updating this
+package alone does not patch PHP: update the interpreter used by every deployment,
+including PHP-FPM, Apache, CGI, FrankenPHP, LiteSpeed, CLI and CI, and restart all
+web workers after the update. Verify the PHP version used by the web server
+separately from `php -v`, which only checks the CLI runtime.
+
+Composer rejects versions outside the supported ranges, but it cannot update the
+runtime or protect deployments that bypass platform checks. Do not use
+`--ignore-platform-reqs` or a `config.platform.php` override to simulate a patched
+runtime. Run `composer check-platform-reqs --no-dev` on the deployed environment
+and verify the web runtime separately. Configuration workarounds are not a
+complete fix and are not applied by this library.
+
 The recommended way to install Linio Common is [through composer](http://getcomposer.org).
 
 ```
@@ -24,6 +53,15 @@ run PHPUnit.
     $ composer install
     $ vendor/bin/phpunit
 
+Run code formatting on PHP 8.2, the lowest supported PHP branch, to avoid
+introducing syntax unsupported by that branch:
+
+    $ composer lint
+    $ composer lint:check
+
+CI checks formatting on PHP 8.2 and runs static analysis and unit tests on every
+supported PHP branch.
+
 ## Collections
 
 This component has a direct dependency on doctrine/collections. You are encouraged
diff --git a/composer.json b/composer.json
index 8c6c6ef..007df87 100644
--- a/composer.json
+++ b/composer.json
@@ -5,11 +5,11 @@
   "type": "library",
   "license": "BSD-3-Clause",
   "require": {
-    "php": "^8.1",
+    "php": "~8.2.35 || ~8.3.36 || ~8.4.27 || ~8.5.12",
     "doctrine/collections": "^1.6"
   },
   "require-dev": {
-    "friendsofphp/php-cs-fixer": "^3.6",
+    "friendsofphp/php-cs-fixer": "^3.95.27",
     "monolog/monolog": "^2.0",
     "phpstan/phpstan": "^1.9",
     "phpunit/phpunit": "^9.4"
diff --git a/src/Exception/ClientException.php b/src/Exception/ClientException.php
index dbe70dc..9ce898a 100644
--- a/src/Exception/ClientException.php
+++ b/src/Exception/ClientException.php
@@ -15,7 +15,7 @@ public function __construct(
         int $statusCode = self::DEFAULT_STATUS_CODE,
         string $message = ExceptionTokens::INVALID_REQUEST,
         array $errors = [],
-        Throwable $previous = null
+        ?Throwable $previous = null
     ) {
         parent::__construct($token, $statusCode, $message, $errors, $previous);
     }
diff --git a/src/Exception/DomainException.php b/src/Exception/DomainException.php
index eee168a..4298ef1 100644
--- a/src/Exception/DomainException.php
+++ b/src/Exception/DomainException.php
@@ -23,7 +23,7 @@ public function __construct(
         int $statusCode = self::DEFAULT_STATUS_CODE,
         string $message = ExceptionTokens::AN_ERROR_HAS_OCCURRED,
         array $errors = [],
-        Throwable $previous = null
+        ?Throwable $previous = null
     ) {
         if (!$this->isExceptionToken($token)) {
             throw new InvalidArgumentException(ExceptionTokens::INVALID_EXCEPTION_TOKEN, 500);
diff --git a/src/Exception/EntityNotFoundException.php b/src/Exception/EntityNotFoundException.php
index d879e20..aab742b 100644
--- a/src/Exception/EntityNotFoundException.php
+++ b/src/Exception/EntityNotFoundException.php
@@ -22,7 +22,7 @@ public function __construct(
         string $token = ExceptionTokens::ENTITY_NOT_FOUND,
         int $statusCode = self::DEFAULT_STATUS_CODE,
         array $errors = [],
-        Throwable $previous = null
+        ?Throwable $previous = null
     ) {
         $formattedIdentifier = $this->getIdentifier($identifier);
         $message = sprintf('Could not find [%s] identified by %s!', $entity, $formattedIdentifier);
diff --git a/src/Type/Collection/FixedTypedCollection.php b/src/Type/Collection/FixedTypedCollection.php
index 33c6904..d0babf8 100644
--- a/src/Type/Collection/FixedTypedCollection.php
+++ b/src/Type/Collection/FixedTypedCollection.php
@@ -4,6 +4,7 @@
 
 namespace Linio\Common\Type\Collection;
 
+use Closure;
 use Doctrine\Common\Collections\Criteria;
 use Doctrine\Common\Collections\Expr\ClosureExpressionVisitor;
 use InvalidArgumentException;
@@ -97,9 +98,9 @@ public function matching(Criteria $criteria)
 
         if ($expr) {
             $visitor = new ClosureExpressionVisitor();
-            $filtered = array_filter($filtered, function () use ($visitor, $expr) {
-                return $visitor->dispatch($expr);
-            });
+            /** @var Closure(mixed): bool $filter */
+            $filter = $visitor->dispatch($expr);
+            $filtered = array_filter($filtered, $filter);
         }
 
         if ($orderings = $criteria->getOrderings()) {
diff --git a/src/Type/Date.php b/src/Type/Date.php
index 451c84f..33bd97d 100644
--- a/src/Type/Date.php
+++ b/src/Type/Date.php
@@ -9,7 +9,7 @@
 
 class Date extends DateTime
 {
-    public function __construct(string $time = 'now', DateTimeZone $timezone = null)
+    public function __construct(string $time = 'now', ?DateTimeZone $timezone = null)
     {
         parent::__construct($time, $timezone);
         $this->setTime(0, 0, 0);
diff --git a/src/Type/Money.php b/src/Type/Money.php
index 78ae510..339e597 100644
--- a/src/Type/Money.php
+++ b/src/Type/Money.php
@@ -89,7 +89,7 @@ public function applyInterest(float $rate, int $duration): MoneyInterface
 
     public function equals(object $other): bool
     {
-        if (!($other instanceof static)) {
+        if (!$other instanceof static) {
             return false;
         }
 
diff --git a/src/Type/PreciseMoney.php b/src/Type/PreciseMoney.php
index 6369d4e..bc05ac9 100644
--- a/src/Type/PreciseMoney.php
+++ b/src/Type/PreciseMoney.php
@@ -91,7 +91,7 @@ public function applyInterest(float $rate, int $duration): MoneyInterface
 
     public function equals(object $other): bool
     {
-        if (!($other instanceof MoneyInterface)) {
+        if (!$other instanceof MoneyInterface) {
             return false;
         }
 
diff --git a/src/Type/Time.php b/src/Type/Time.php
index 83df3f0..ab59d63 100644
--- a/src/Type/Time.php
+++ b/src/Type/Time.php
@@ -9,7 +9,7 @@
 
 class Time extends DateTime
 {
-    public function __construct(string $time = 'now', DateTimeZone $timezone = null)
+    public function __construct(string $time = 'now', ?DateTimeZone $timezone = null)
     {
         parent::__construct($time, $timezone);
         $this->setDate(1970, 1, 1);
diff --git a/tests/Type/Collection/FixedTypedCollectionTest.php b/tests/Type/Collection/FixedTypedCollectionTest.php
index 45bb207..ed9c339 100644
--- a/tests/Type/Collection/FixedTypedCollectionTest.php
+++ b/tests/Type/Collection/FixedTypedCollectionTest.php
@@ -13,9 +13,9 @@ class FixedTypedCollectionTest extends TestCase
 {
     public function testIsValidatingSizeOnConstructor(): void
     {
-        $object1 = new class() {
+        $object1 = new class {
         };
-        $object2 = new class() {
+        $object2 = new class {
         };
 
         $this->expectException(InvalidArgumentException::class);
@@ -41,13 +41,13 @@ public function isValidType($value): bool
         $this->expectException(InvalidArgumentException::class);
         $this->expectExceptionMessage('Index invalid or out of range');
 
-        $collection[] = new class() {
+        $collection[] = new class {
         };
     }
 
     public function testIsValidatingSizeOnAdd(): void
     {
-        $object1 = new class() {
+        $object1 = new class {
         };
 
         $collection = new class(0) extends FixedTypedCollection {
@@ -65,7 +65,7 @@ public function isValidType($value): bool
 
     public function testIsGetting(): void
     {
-        $object1 = new class() {
+        $object1 = new class {
         };
 
         $collection = new class(1, [$object1]) extends FixedTypedCollection {
@@ -80,7 +80,7 @@ public function isValidType($value): bool
 
     public function testIsValidatingKeyOnGet(): void
     {
-        $object1 = new class() {
+        $object1 = new class {
         };
 
         $collection = new class(1, [$object1]) extends FixedTypedCollection {
@@ -98,7 +98,7 @@ public function isValidType($value): bool
 
     public function testIsValidatingKeyOnOffsetGet(): void
     {
-        $object1 = new class() {
+        $object1 = new class {
             public $test = 'foo';
         };
 
@@ -117,11 +117,14 @@ public function isValidType($value): bool
 
     public function testIsApplyingMatchingCriteria(): void
     {
-        $object1 = new class() {
+        $object1 = new class {
             public $test = 'foo';
         };
+        $object2 = new class {
+            public $test = 'bar';
+        };
 
-        $collection = new class(1, [$object1]) extends FixedTypedCollection {
+        $collection = new class(2, [$object1, $object2]) extends FixedTypedCollection {
             public function isValidType($value): bool
             {
                 return true;
@@ -133,5 +136,10 @@ public function isValidType($value): bool
         $actual = $collection->matching($criteria);
 
         $this->assertSame([$object1], $actual->getValues());
+
+        $criteria = Criteria::create()->where((new ExpressionBuilder())->eq('test', 'missing'));
+
+        $this->assertSame([], $collection->matching($criteria)->getValues());
+        $this->assertSame([$object1, $object2], $collection->getValues());
     }
 }