diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3c6f8a5..f798625 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,13 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project follows [Semantic Versioning](https://semver.org/spec/v2.0.0.html)
 where applicable.
 
+## 1.0.7 — 2026-10-16
+
+- Require Symfony ExpressionLanguage 8.1.9 and YAML 8.1.6 or newer to exclude CVE-2026-109449 and CVE-2026-109413.
+- Require SymPress Kernel 1.1.10 or newer to retain the corrected HttpFoundation 8.1.9 minimum in lowest-version installations.
+- Require Symfony FrameworkBundle 8.1.8 or newer so the native development cache warmer is registered when the profiler is disabled.
+- Verify dependency version boundaries and rejection of excessively nested expressions and inline YAML collections.
+
 ## 1.0.6 — 2026-10-09
 
 - Require maintained Symfony Routing and YAML 8.1 or newer, excluding the vulnerable 8.0 releases covered by the May 2026 advisories.
diff --git a/composer.json b/composer.json
index ef0f7d3..a75f13d 100644
--- a/composer.json
+++ b/composer.json
@@ -20,17 +20,18 @@
         "symfony/console": "^8.1",
         "symfony/dependency-injection": "^8.1.8",
         "symfony/error-handler": "^8.1",
-        "symfony/expression-language": "^8.0",
+        "symfony/expression-language": "^8.1.9",
         "symfony/filesystem": "^8.0",
-        "symfony/framework-bundle": "^8.1",
+        "symfony/framework-bundle": "^8.1.8",
         "symfony/http-kernel": "^8.1",
         "symfony/routing": "^8.1",
         "symfony/service-contracts": "^3.6",
-        "symfony/yaml": "^8.1",
-        "sympress/kernel": "^1.1.1"
+        "symfony/yaml": "^8.1.6",
+        "sympress/kernel": "^1.1.10"
     },
     "require-dev": {
         "brain/monkey": "^2.6",
+        "composer/semver": "^3.4",
         "sympress/qa": "^0.1.2"
     },
     "suggest": {
diff --git a/tests/Security/SymfonySecurityCompatibilityTest.php b/tests/Security/SymfonySecurityCompatibilityTest.php
new file mode 100644
index 0000000..c42abff
--- /dev/null
+++ b/tests/Security/SymfonySecurityCompatibilityTest.php
@@ -0,0 +1,77 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SymPress\Framework\Tests\Security;
+
+use Composer\Semver\Semver;
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\DependencyInjection\ExpressionLanguage;
+use Symfony\Component\ExpressionLanguage\SyntaxError;
+use Symfony\Component\Yaml\Exception\ParseException;
+use Symfony\Component\Yaml\Parser;
+
+final class SymfonySecurityCompatibilityTest extends TestCase
+{
+    #[DataProvider('dependencyBoundaries')]
+    public function testDeclaredRequirementsExcludeUnsafeVersions(string $package, string $rejected, string $accepted): void
+    {
+        /** @var array{require: array<string, string>} $manifest */
+        $manifest = json_decode((string) file_get_contents(dirname(__DIR__, 2) . '/composer.json'), true, flags: JSON_THROW_ON_ERROR);
+
+        self::assertFalse(Semver::satisfies($rejected, $manifest['require'][$package]));
+        self::assertTrue(Semver::satisfies($accepted, $manifest['require'][$package]));
+    }
+
+    /** @return iterable<string, array{string, string, string}> */
+    public static function dependencyBoundaries(): iterable
+    {
+        yield 'expression initial incomplete fix' => ['symfony/expression-language', '8.1.6', '8.1.9'];
+        yield 'expression last affected patch' => ['symfony/expression-language', '8.1.8', '8.1.9'];
+        yield 'yaml inline lexer' => ['symfony/yaml', '8.1.5', '8.1.6'];
+        yield 'kernel header parser floor' => ['sympress/kernel', '1.1.9', '1.1.10'];
+        yield 'native development cache warmer' => ['symfony/framework-bundle', '8.1.7', '8.1.8'];
+    }
+
+    #[DataProvider('deepExpressions')]
+    public function testDependencyInjectionRejectsDeepExpressions(string $expression): void
+    {
+        try {
+            (new ExpressionLanguage())->lint($expression, []);
+            self::fail('An excessively nested expression was accepted.');
+        } catch (SyntaxError $exception) {
+            self::assertStringContainsString('maximum nesting level is 256', $exception->getMessage());
+        }
+    }
+
+    /** @return iterable<string, array{string}> */
+    public static function deepExpressions(): iterable
+    {
+        yield 'unary nesting' => [str_repeat('!', 300) . '1'];
+
+        $expression = '1';
+        for ($level = 0; $level < 60; ++$level) {
+            $expression = '(' . $expression . str_repeat(' + 1', 60) . ')';
+        }
+        yield 'chained binary nesting missed by 8.1.6' => [$expression];
+    }
+
+    public function testOrdinaryDependencyInjectionExpressionStillWorks(): void
+    {
+        self::assertSame(3, (new ExpressionLanguage())->evaluate('1 + 2'));
+    }
+
+    public function testInlineYamlLexerHonorsConfiguredNestingLimit(): void
+    {
+        $parser = new Parser(8);
+        self::assertSame(['root' => [[1]]], $parser->parse('root: [[1]]'));
+
+        try {
+            $parser->parse('root: ' . str_repeat('[', 9));
+            self::fail('The inline YAML lexer exceeded its configured nesting limit.');
+        } catch (ParseException $exception) {
+            self::assertStringContainsString('Maximum nesting depth of 8 exceeded', $exception->getMessage());
+        }
+    }
+}