diff --git a/src/Symfony/Bridge/ProxyManager/LazyProxy/PhpDumper/ProxyDumper.php b/src/Symfony/Bridge/ProxyManager/LazyProxy/PhpDumper/ProxyDumper.php
index 3ce787b852..b3234194bc 100644
--- a/src/Symfony/Bridge/ProxyManager/LazyProxy/PhpDumper/ProxyDumper.php
+++ b/src/Symfony/Bridge/ProxyManager/LazyProxy/PhpDumper/ProxyDumper.php
@@ -53,7 +53,7 @@ class ProxyDumper implements DumperInterface
         $instantiation = 'return';
 
         if ($definition->isShared()) {
-            $instantiation .= sprintf(' $this->%s[\'%s\'] =', \method_exists(ContainerBuilder::class, 'addClassResource') || ($definition->isPublic() && !$definition->isPrivate()) ? 'services' : 'privates', $id);
+            $instantiation .= sprintf(' $this->%s[\'%s\'] =', $definition->isPublic() && !$definition->isPrivate() ? 'services' : 'privates', $id);
         }
 
         if (null === $factoryCode) {
diff --git a/src/Symfony/Bridge/ProxyManager/Tests/LazyProxy/PhpDumper/ProxyDumperTest.php b/src/Symfony/Bridge/ProxyManager/Tests/LazyProxy/PhpDumper/ProxyDumperTest.php
index 634ab6627c..4d5702dc8d 100644
--- a/src/Symfony/Bridge/ProxyManager/Tests/LazyProxy/PhpDumper/ProxyDumperTest.php
+++ b/src/Symfony/Bridge/ProxyManager/Tests/LazyProxy/PhpDumper/ProxyDumperTest.php
@@ -99,7 +99,7 @@ class ProxyDumperTest extends TestCase
             array(
                 (new Definition(__CLASS__))
                     ->setPublic(false),
-                \method_exists(ContainerBuilder::class, 'addClassResource') ? 'services' : 'privates',
+                'privates',
             ),
             array(
                 (new Definition(__CLASS__))
diff --git a/src/Symfony/Bridge/ProxyManager/composer.json b/src/Symfony/Bridge/ProxyManager/composer.json
index 441389af82..16b95e8318 100644
--- a/src/Symfony/Bridge/ProxyManager/composer.json
+++ b/src/Symfony/Bridge/ProxyManager/composer.json
@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": "^7.1.3",
-        "symfony/dependency-injection": "~3.4|~4.0",
+        "symfony/dependency-injection": "~4.0",
         "ocramius/proxy-manager": "~2.1"
     },
     "require-dev": {
diff --git a/src/Symfony/Component/Cache/Marshaller/DefaultMarshaller.php b/src/Symfony/Component/Cache/Marshaller/DefaultMarshaller.php
index 734f32fcd8..16c02bb08f 100644
--- a/src/Symfony/Component/Cache/Marshaller/DefaultMarshaller.php
+++ b/src/Symfony/Component/Cache/Marshaller/DefaultMarshaller.php
@@ -76,12 +76,12 @@ class DefaultMarshaller implements MarshallerInterface
                     return $value;
                 }
             } elseif (false === $igbinaryNull) {
-                throw new \RuntimeException('Failed to unserialize cached value, did you forget to install the "igbinary" extension?');
+                throw new \RuntimeException('Failed to unserialize values, did you forget to install the "igbinary" extension?');
             } elseif (null !== $value = igbinary_unserialize($value)) {
                 return $value;
             }
 
-            throw new \DomainException(error_get_last() ? error_get_last()['message'] : 'Failed to unserialize cached value');
+            throw new \DomainException(error_get_last() ? error_get_last()['message'] : 'Failed to unserialize values.');
         } catch (\Error $e) {
             throw new \ErrorException($e->getMessage(), $e->getCode(), E_ERROR, $e->getFile(), $e->getLine());
         } finally {
diff --git a/src/Symfony/Component/Cache/Marshaller/MarshallerInterface.php b/src/Symfony/Component/Cache/Marshaller/MarshallerInterface.php
index 4d757e38c4..cdd6c4022c 100644
--- a/src/Symfony/Component/Cache/Marshaller/MarshallerInterface.php
+++ b/src/Symfony/Component/Cache/Marshaller/MarshallerInterface.php
@@ -14,7 +14,7 @@ namespace Symfony\Component\Cache\Marshaller;
 /**
  * Serializes/unserializes PHP values.
  *
- * Implementations of this interface MUST deal with errors carefuly. They MUST
+ * Implementations of this interface MUST deal with errors carefully. They MUST
  * also deal with forward and backward compatibility at the storage format level.
  *
  * @author Nicolas Grekas <p@tchwork.com>