diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Fixtures/Resources/translations2/ccc.fr.yml b/src/Symfony/Bundle/FrameworkBundle/Tests/Fixtures/Resources/translations2/ccc.fr.yml
new file mode 100644
index 0000000000000..20e9ff3feaa8e
--- /dev/null
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Fixtures/Resources/translations2/ccc.fr.yml
@@ -0,0 +1 @@
+foo: bar
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Translation/TranslatorTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Translation/TranslatorTest.php
index 26753e8a8a548..cd3f3d9fba858 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Translation/TranslatorTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Translation/TranslatorTest.php
@@ -18,6 +18,7 @@
 use Symfony\Component\Config\Resource\FileExistenceResource;
 use Symfony\Component\Filesystem\Filesystem;
 use Symfony\Component\Translation\Formatter\MessageFormatter;
+use Symfony\Component\Translation\Loader\YamlFileLoader;
 use Symfony\Component\Translation\MessageCatalogue;
 
 class TranslatorTest extends TestCase
@@ -244,6 +245,41 @@ public function testCatalogResourcesAreAddedForScannedDirectories()
         $this->assertEquals(new FileExistenceResource('/tmp/I/sure/hope/this/does/not/exist'), $resources[2]);
     }
 
+    public function testCachedCatalogueIsReDumpedWhenScannedDirectoriesChange()
+    {
+        /** @var Translator $translator */
+        $translator = $this->getTranslator(new YamlFileLoader(), [
+            'cache_dir' => $this->tmpDir,
+            'resource_files' => [
+                'fr' => [
+                    __DIR__.'/../Fixtures/Resources/translations/messages.fr.yml',
+                ],
+            ],
+            'scanned_directories' => [
+                __DIR__.'/../Fixtures/Resources/translations/',
+            ],
+        ], 'yml');
+
+        // Cached catalogue is dumped
+        $this->assertSame('répertoire', $translator->trans('folder', [], 'messages', 'fr'));
+
+        $translator = $this->getTranslator(new YamlFileLoader(), [
+            'cache_dir' => $this->tmpDir,
+            'resource_files' => [
+                'fr' => [
+                    __DIR__.'/../Fixtures/Resources/translations/messages.fr.yml',
+                    __DIR__.'/../Fixtures/Resources/translations2/ccc.fr.yml',
+                ],
+            ],
+            'scanned_directories' => [
+                __DIR__.'/../Fixtures/Resources/translations/',
+                __DIR__.'/../Fixtures/Resources/translations2/',
+            ],
+        ], 'yml');
+
+        $this->assertSame('bar', $translator->trans('foo', [], 'ccc', 'fr'));
+    }
+
     protected function getCatalogue($locale, $messages, $resources = [])
     {
         $catalogue = new MessageCatalogue($locale);
diff --git a/src/Symfony/Bundle/FrameworkBundle/Translation/Translator.php b/src/Symfony/Bundle/FrameworkBundle/Translation/Translator.php
index 511da9fb22c1c..f718c8d0157bc 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Translation/Translator.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Translation/Translator.php
@@ -82,7 +82,9 @@ public function __construct(ContainerInterface $container, MessageFormatterInter
         $this->resourceFiles = $this->options['resource_files'];
         $this->scannedDirectories = $this->options['scanned_directories'];
 
-        parent::__construct($defaultLocale, $formatter, $this->options['cache_dir'], $this->options['debug']);
+        parent::__construct($defaultLocale, $formatter, $this->options['cache_dir'], $this->options['debug'], [
+            'scanned_directories' => $this->scannedDirectories,
+        ]);
     }
 
     /**
diff --git a/src/Symfony/Bundle/FrameworkBundle/composer.json b/src/Symfony/Bundle/FrameworkBundle/composer.json
index 57c344f68f22e..55b9e0cbf041c 100644
--- a/src/Symfony/Bundle/FrameworkBundle/composer.json
+++ b/src/Symfony/Bundle/FrameworkBundle/composer.json
@@ -49,7 +49,7 @@
         "symfony/security-http": "~3.4|~4.0",
         "symfony/serializer": "^4.3",
         "symfony/stopwatch": "~3.4|~4.0",
-        "symfony/translation": "~4.3",
+        "symfony/translation": "^4.3.6",
         "symfony/templating": "~3.4|~4.0",
         "symfony/twig-bundle": "~2.8|~3.2|~4.0",
         "symfony/validator": "^4.1",
@@ -77,7 +77,7 @@
         "symfony/property-info": "<3.4",
         "symfony/serializer": "<4.2",
         "symfony/stopwatch": "<3.4",
-        "symfony/translation": "<4.3",
+        "symfony/translation": "<4.3.6",
         "symfony/twig-bridge": "<4.1.1",
         "symfony/validator": "<4.1",
         "symfony/workflow": "<4.3.6"
diff --git a/src/Symfony/Component/Translation/Tests/TranslatorCacheTest.php b/src/Symfony/Component/Translation/Tests/TranslatorCacheTest.php
index 08add3404b5c7..ae5c75ba82c22 100644
--- a/src/Symfony/Component/Translation/Tests/TranslatorCacheTest.php
+++ b/src/Symfony/Component/Translation/Tests/TranslatorCacheTest.php
@@ -269,6 +269,22 @@ public function testRefreshCacheWhenResourcesAreNoLongerFresh()
         $translator->trans('foo');
     }
 
+    public function testCachedCatalogueIsReDumpedWhenCacheVaryChange()
+    {
+        $translator = new Translator('a', null, $this->tmpDir, false, []);
+        $translator->addLoader('array', new ArrayLoader());
+        $translator->addResource('array', ['foo' => 'bar'], 'a', 'messages');
+
+        // Cached catalogue is dumped
+        $this->assertSame('bar', $translator->trans('foo', [], 'messages', 'a'));
+
+        $translator = new Translator('a', null, $this->tmpDir, false, ['vary']);
+        $translator->addLoader('array', new ArrayLoader());
+        $translator->addResource('array', ['foo' => 'ccc'], 'a', 'messages');
+
+        $this->assertSame('ccc', $translator->trans('foo', [], 'messages', 'a'));
+    }
+
     protected function getCatalogue($locale, $messages, $resources = [])
     {
         $catalogue = new MessageCatalogue($locale);
diff --git a/src/Symfony/Component/Translation/Translator.php b/src/Symfony/Component/Translation/Translator.php
index 9846c8338bb17..d9241d5a82625 100644
--- a/src/Symfony/Component/Translation/Translator.php
+++ b/src/Symfony/Component/Translation/Translator.php
@@ -71,6 +71,8 @@ class Translator implements LegacyTranslatorInterface, TranslatorInterface, Tran
      */
     private $debug;
 
+    private $cacheVary;
+
     /**
      * @var ConfigCacheFactoryInterface|null
      */
@@ -86,7 +88,7 @@ class Translator implements LegacyTranslatorInterface, TranslatorInterface, Tran
     /**
      * @throws InvalidArgumentException If a locale contains invalid characters
      */
-    public function __construct(?string $locale, MessageFormatterInterface $formatter = null, string $cacheDir = null, bool $debug = false)
+    public function __construct(?string $locale, MessageFormatterInterface $formatter = null, string $cacheDir = null, bool $debug = false, array $cacheVary = [])
     {
         $this->setLocale($locale);
 
@@ -97,6 +99,7 @@ public function __construct(?string $locale, MessageFormatterInterface $formatte
         $this->formatter = $formatter;
         $this->cacheDir = $cacheDir;
         $this->debug = $debug;
+        $this->cacheVary = $cacheVary;
         $this->hasIntlFormatter = $formatter instanceof IntlFormatterInterface;
     }
 
@@ -176,7 +179,7 @@ public function setFallbackLocales(array $locales)
             $this->assertValidLocale($locale);
         }
 
-        $this->fallbackLocales = $locales;
+        $this->fallbackLocales = $this->cacheVary['fallback_locales'] = $locales;
     }
 
     /**
@@ -392,7 +395,7 @@ private function getFallbackContent(MessageCatalogue $catalogue): string
 
     private function getCatalogueCachePath($locale)
     {
-        return $this->cacheDir.'/catalogue.'.$locale.'.'.strtr(substr(base64_encode(hash('sha256', serialize($this->fallbackLocales), true)), 0, 7), '/', '_').'.php';
+        return $this->cacheDir.'/catalogue.'.$locale.'.'.strtr(substr(base64_encode(hash('sha256', serialize($this->cacheVary), true)), 0, 7), '/', '_').'.php';
     }
 
     /**