diff --git a/app/modules/image/app_image.deploy.php b/app/modules/image/app_image.deploy.php
new file mode 100644
index 00000000..ba029b93
--- /dev/null
+++ b/app/modules/image/app_image.deploy.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @file
+ * Deploy hooks for app_image module.
+ */
+
+use Drupal\app_image\Hook\Deploy\Deploy0001;
+use Drupal\app_image\Hook\Deploy\Deploy0002;
+
+/**
+ * Delete dynamic image style security key from state.
+ */
+function app_image_deploy_0001(): string {
+  return \Drupal::classResolver(Deploy0001::class)();
+}
+
+/**
+ * Delete generated dynamic image style derivatives.
+ */
+function app_image_deploy_0002(): string {
+  return \Drupal::classResolver(Deploy0002::class)();
+}
diff --git a/app/modules/image/app_image.install b/app/modules/image/app_image.install
deleted file mode 100644
index df02b49c..00000000
--- a/app/modules/image/app_image.install
+++ /dev/null
@@ -1,24 +0,0 @@
-<?php
-
-/**
- * @file
- * Install and uninstall hooks for the App: Image module.
- */
-
-declare(strict_types=1);
-
-use Drupal\Component\Utility\Crypt;
-
-/**
- * Implements hook_install().
- */
-function app_image_install(): void {
-  \Drupal::state()->set('app_image.dynamic_image_style_key', Crypt::randomBytesBase64());
-}
-
-/**
- * Implements hook_uninstall().
- */
-function app_image_uninstall(): void {
-  \Drupal::state()->delete('app_image.dynamic_image_style_key');
-}
diff --git a/app/modules/image/src/DynamicImageStyle/DynamicImageStyle.php b/app/modules/image/src/DynamicImageStyle/DynamicImageStyle.php
index cd1b3514..33f72116 100644
--- a/app/modules/image/src/DynamicImageStyle/DynamicImageStyle.php
+++ b/app/modules/image/src/DynamicImageStyle/DynamicImageStyle.php
@@ -7,8 +7,7 @@
 use Drupal\Component\Utility\Crypt;
 use Drupal\Component\Utility\UrlHelper;
 use Drupal\Core\Entity\EntityTypeManagerInterface;
-use Drupal\Core\Site\Settings;
-use Drupal\Core\State\StateInterface;
+use Drupal\Core\PrivateKey;
 use Drupal\Core\StreamWrapper\LocalStream;
 use Drupal\Core\StreamWrapper\StreamWrapperManager;
 use Drupal\Core\StreamWrapper\StreamWrapperManagerInterface;
@@ -34,7 +33,7 @@
   public function __construct(
     private EntityTypeManagerInterface $entityTypeManager,
     private StreamWrapperManagerInterface $streamWrapperManager,
-    private StateInterface $state,
+    private PrivateKey $privateKey,
   ) {}
 
   public function effect(string $id, array $data = []): DynamicImageStyleBuilder {
@@ -45,52 +44,19 @@ public function effect(string $id, array $data = []): DynamicImageStyleBuilder {
    * @param list<array{0: string, 1: array<string, mixed>}> $effects
    */
   public function buildUrl(string $uri, array $effects): string {
-    $scheme = StreamWrapperManager::getScheme($uri);
-    $target = StreamWrapperManager::getTarget($uri);
-    Assert::string($scheme);
-    Assert::string($target);
-    $compressed = $this->compressEffects($effects);
+    [$scheme, $target, $compressed, $hash] = $this->resolveDerivativePath($uri, $effects);
     $itok = $this->generateToken($compressed, $uri);
-    $hash = Crypt::hashBase64($compressed);
-
-    $image_style = $this->createImageStyle($effects);
-    $original_extension = \pathinfo($target, \PATHINFO_EXTENSION);
-    $derivative_extension = $image_style->getDerivativeExtension($original_extension);
-
-    $path = $target;
-    if ($original_extension !== $derivative_extension) {
-      $path .= '.' . $derivative_extension;
-    }
-
+    $encoded_effects = \urlencode($compressed);
     $base_path = $this->getBaseUrlPath($scheme);
-
-    return '/' . $base_path . '/styles/dynamic/' . $hash . '/' . $scheme . '/' . $path
-      . '?effects=' . \urlencode($compressed)
-      . '&itok=' . $itok;
+    return "/$base_path/styles/dynamic/$hash/$scheme/$target?effects=$encoded_effects&itok=$itok";
   }
 
   /**
    * @param list<array{0: string, 1: array<string, mixed>}> $effects
    */
   public function buildUri(string $uri, array $effects): string {
-    $scheme = StreamWrapperManager::getScheme($uri);
-    $target = StreamWrapperManager::getTarget($uri);
-    Assert::string($scheme);
-    Assert::string($target);
-
-    $compressed = $this->compressEffects($effects);
-    $hash = Crypt::hashBase64($compressed);
-
-    $image_style = $this->createImageStyle($effects);
-    $original_extension = \pathinfo($target, \PATHINFO_EXTENSION);
-    $derivative_extension = $image_style->getDerivativeExtension($original_extension);
-
-    $path = $target;
-    if ($original_extension !== $derivative_extension) {
-      $path .= '.' . $derivative_extension;
-    }
-
-    return "$scheme://styles/dynamic/$hash/$scheme/$path";
+    [$scheme, $target, , $hash] = $this->resolveDerivativePath($uri, $effects);
+    return "$scheme://styles/dynamic/$hash/$scheme/$target";
   }
 
   /**
@@ -121,8 +87,7 @@ public function decompressEffects(string $compressed): array {
   }
 
   public function generateToken(string $compressed, string $uri): string {
-    $key = $this->state->get('app_image.dynamic_image_style_key', Settings::getHashSalt());
-    return \substr(Crypt::hmacBase64($compressed . ':' . $uri, $key), 0, 8);
+    return \substr(Crypt::hmacBase64($compressed . ':' . $uri, $this->privateKey->get()), 0, 8);
   }
 
   /**
@@ -140,6 +105,33 @@ public function createImageStyle(array $effects): ImageStyleInterface {
     return $image_style;
   }
 
+  private function hashEffects(string $compressed): string {
+    return \substr(Crypt::hashBase64($compressed), 0, 8);
+  }
+
+  /**
+   * @param list<array{0: string, 1: array<string, mixed>}> $effects
+   * @return array{string, string, string, string}
+   */
+  private function resolveDerivativePath(string $uri, array $effects): array {
+    $scheme = StreamWrapperManager::getScheme($uri);
+    $target = StreamWrapperManager::getTarget($uri);
+    Assert::string($scheme);
+    Assert::string($target);
+
+    $image_style = $this->createImageStyle($effects);
+    $original_extension = \pathinfo($target, \PATHINFO_EXTENSION);
+    $derivative_extension = $image_style->getDerivativeExtension($original_extension);
+    if ($original_extension !== $derivative_extension) {
+      $target .= '.' . $derivative_extension;
+    }
+
+    $compressed = $this->compressEffects($effects);
+    $hash = $this->hashEffects($compressed);
+
+    return [$scheme, $target, $compressed, $hash];
+  }
+
   /**
    * Returns the base URL path for the given stream wrapper scheme.
    *
diff --git a/app/modules/image/src/Hook/Deploy/Deploy0001.php b/app/modules/image/src/Hook/Deploy/Deploy0001.php
new file mode 100644
index 00000000..4fdf1298
--- /dev/null
+++ b/app/modules/image/src/Hook/Deploy/Deploy0001.php
@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\app_image\Hook\Deploy;
+
+use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Drupal\Core\State\StateInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+final class Deploy0001 implements ContainerInjectionInterface {
+
+  public static function create(ContainerInterface $container): self {
+    return new self(
+      $container->get(StateInterface::class),
+    );
+  }
+
+  public function __construct(
+    private StateInterface $state,
+  ) {}
+
+  public function __invoke(): string {
+    $this->state->delete('app_image.dynamic_image_style_key');
+    return 'Deleted app_image.dynamic_image_style_key from state.';
+  }
+
+}
diff --git a/app/modules/image/src/Hook/Deploy/Deploy0002.php b/app/modules/image/src/Hook/Deploy/Deploy0002.php
new file mode 100644
index 00000000..99d7acf6
--- /dev/null
+++ b/app/modules/image/src/Hook/Deploy/Deploy0002.php
@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\app_image\Hook\Deploy;
+
+use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Drupal\Core\File\FileSystemInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+final class Deploy0002 implements ContainerInjectionInterface {
+
+  public static function create(ContainerInterface $container): self {
+    return new self(
+      $container->get('file_system'),
+    );
+  }
+
+  public function __construct(
+    private FileSystemInterface $fileSystem,
+  ) {}
+
+  public function __invoke(): string {
+    $deleted = [];
+    foreach (['public', 'private'] as $scheme) {
+      $dir = $scheme . '://styles/dynamic';
+      if (!\is_dir($dir)) {
+        continue;
+      }
+
+      $this->fileSystem->deleteRecursive($dir);
+      $deleted[] = $scheme;
+    }
+
+    if ($deleted === []) {
+      return 'No dynamic style directories found.';
+    }
+
+    return \sprintf('Deleted styles/dynamic in: %s.', \implode(', ', $deleted));
+  }
+
+}
diff --git a/app/modules/image/src/PathProcessor/DynamicImageStylePathProcessor.php b/app/modules/image/src/PathProcessor/DynamicImageStylePathProcessor.php
index 6943c33d..3a8ccdd9 100644
--- a/app/modules/image/src/PathProcessor/DynamicImageStylePathProcessor.php
+++ b/app/modules/image/src/PathProcessor/DynamicImageStylePathProcessor.php
@@ -40,10 +40,12 @@ public function processInbound($path, Request $request): string {
     }
 
     // Private files: /system/files/styles/dynamic/...
-    // Rewrite to internal path that won't be caught by PathProcessorFiles.
+    // Set 'file' query param to block PathProcessorFiles (it skips processing
+    // when 'file' is already present), then rewrite to the registered route.
     $private_prefix = '/system/files/styles/dynamic/';
     if (\str_starts_with($path, $private_prefix)) {
-      return '/app-image/dynamic-private';
+      $request->query->set('file', 'dynamic');
+      return '/system/files/styles/dynamic';
     }
 
     return $path;
diff --git a/app/modules/image/src/Routing/RouteProvider.php b/app/modules/image/src/Routing/RouteProvider.php
index d151634d..7a344911 100644
--- a/app/modules/image/src/Routing/RouteProvider.php
+++ b/app/modules/image/src/Routing/RouteProvider.php
@@ -37,7 +37,7 @@ public function __invoke(): RouteCollection {
     ));
 
     $routes->add('app_image.dynamic_image_style_private', new Route(
-      path: '/app-image/dynamic-private',
+      path: '/system/files/styles/dynamic',
       defaults: [
         '_controller' => DynamicImageStyleController::class,
         '_disable_route_normalizer' => TRUE,