diff --git a/composer.json b/composer.json
index f8b2ef8c9..746624526 100644
--- a/composer.json
+++ b/composer.json
@@ -37,10 +37,10 @@
         "silverstripe/vendor-plugin": "^1.4",
         "sminnee/callbacklist": "^0.1",
         "swiftmailer/swiftmailer": "~5.4",
-        "symfony/cache": "^3.3@dev",
-        "symfony/config": "^3.2",
-        "symfony/translation": "^2.8",
-        "symfony/yaml": "~3.2",
+        "symfony/cache": "^3.3 || ^4",
+        "symfony/config": "^3.2 || ^4",
+        "symfony/translation": "^2.8 || ^3 || ^4",
+        "symfony/yaml": "^3.2 || ^4",
         "php": ">=7.1.0",
         "ext-ctype": "*",
         "ext-dom": "*",
diff --git a/src/i18n/Messages/YamlWriter.php b/src/i18n/Messages/YamlWriter.php
index d5917f977..14a6b47ae 100644
--- a/src/i18n/Messages/YamlWriter.php
+++ b/src/i18n/Messages/YamlWriter.php
@@ -29,8 +29,7 @@ class YamlWriter implements Writer
     protected function getDumper()
     {
         if (!$this->dumper) {
-            $this->dumper = new Dumper();
-            $this->dumper->setIndentation(2);
+            $this->dumper = new Dumper(2);
         }
         return $this->dumper;
     }
diff --git a/tests/php/ORM/DataObjectTest.yml b/tests/php/ORM/DataObjectTest.yml
index 242eceba8..b55c6811a 100644
--- a/tests/php/ORM/DataObjectTest.yml
+++ b/tests/php/ORM/DataObjectTest.yml
@@ -143,7 +143,7 @@ SilverStripe\ORM\Tests\DataObjectTest\Company:
   company1:
     Name: Company corp
     Owner: =>SilverStripe\ORM\Tests\DataObjectTest\Player.player1
-  company1:
+  company2:
     Name: 'Team co.'
     Owner: =>SilverStripe\ORM\Tests\DataObjectTest\Player.player2
 SilverStripe\ORM\Tests\DataObjectTest\Bracket: