diff --git a/src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php b/src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php
index be0c75b2cac73..d9fd24c3d71a6 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php
@@ -654,7 +654,7 @@ protected function loadFile($file)
         }
 
         try {
-            $configuration = $this->yamlParser->parse(file_get_contents($file), Yaml::PARSE_CONSTANT | Yaml::PARSE_CUSTOM_TAGS);
+            $configuration = $this->yamlParser->parseFile($file, Yaml::PARSE_CONSTANT | Yaml::PARSE_CUSTOM_TAGS);
         } catch (ParseException $e) {
             throw new InvalidArgumentException(sprintf('The file "%s" does not contain valid YAML.', $file), 0, $e);
         }
diff --git a/src/Symfony/Component/Routing/Loader/YamlFileLoader.php b/src/Symfony/Component/Routing/Loader/YamlFileLoader.php
index 5a087513215a6..f3072c927b73e 100644
--- a/src/Symfony/Component/Routing/Loader/YamlFileLoader.php
+++ b/src/Symfony/Component/Routing/Loader/YamlFileLoader.php
@@ -58,7 +58,7 @@ public function load($file, $type = null)
         }
 
         try {
-            $parsedConfig = $this->yamlParser->parse(file_get_contents($path));
+            $parsedConfig = $this->yamlParser->parseFile($path);
         } catch (ParseException $e) {
             throw new \InvalidArgumentException(sprintf('The file "%s" does not contain valid YAML.', $path), 0, $e);
         }
diff --git a/src/Symfony/Component/Routing/composer.json b/src/Symfony/Component/Routing/composer.json
index 1226ffde886d7..2ad746ec53c24 100644
--- a/src/Symfony/Component/Routing/composer.json
+++ b/src/Symfony/Component/Routing/composer.json
@@ -21,7 +21,7 @@
     "require-dev": {
         "symfony/config": "~2.8|~3.0|~4.0",
         "symfony/http-foundation": "~2.8|~3.0|~4.0",
-        "symfony/yaml": "~3.3|~4.0",
+        "symfony/yaml": "~3.4|~4.0",
         "symfony/expression-language": "~2.8|~3.0|~4.0",
         "symfony/dependency-injection": "~3.3|~4.0",
         "doctrine/annotations": "~1.0",
@@ -31,7 +31,7 @@
     "conflict": {
         "symfony/config": "<2.8",
         "symfony/dependency-injection": "<3.3",
-        "symfony/yaml": "<3.3"
+        "symfony/yaml": "<3.4"
     },
     "suggest": {
         "symfony/http-foundation": "For using a Symfony Request object",
diff --git a/src/Symfony/Component/Serializer/Mapping/Loader/YamlFileLoader.php b/src/Symfony/Component/Serializer/Mapping/Loader/YamlFileLoader.php
index e3afa4763271e..970241d34767f 100644
--- a/src/Symfony/Component/Serializer/Mapping/Loader/YamlFileLoader.php
+++ b/src/Symfony/Component/Serializer/Mapping/Loader/YamlFileLoader.php
@@ -113,7 +113,7 @@ private function getClassesFromYaml()
             $this->yamlParser = new Parser();
         }
 
-        $classes = $this->yamlParser->parse(file_get_contents($this->file));
+        $classes = $this->yamlParser->parseFile($this->file);
 
         if (empty($classes)) {
             return array();
diff --git a/src/Symfony/Component/Translation/Loader/YamlFileLoader.php b/src/Symfony/Component/Translation/Loader/YamlFileLoader.php
index 41e390d0e967d..874fa3a8943e8 100644
--- a/src/Symfony/Component/Translation/Loader/YamlFileLoader.php
+++ b/src/Symfony/Component/Translation/Loader/YamlFileLoader.php
@@ -39,7 +39,7 @@ protected function loadResource($resource)
         }
 
         try {
-            $messages = $this->yamlParser->parse(file_get_contents($resource));
+            $messages = $this->yamlParser->parseFile($resource);
         } catch (ParseException $e) {
             throw new InvalidResourceException(sprintf('Error parsing YAML, invalid file "%s"', $resource), 0, $e);
         }
diff --git a/src/Symfony/Component/Translation/composer.json b/src/Symfony/Component/Translation/composer.json
index 48873b98268c4..3a1e1589f5460 100644
--- a/src/Symfony/Component/Translation/composer.json
+++ b/src/Symfony/Component/Translation/composer.json
@@ -23,14 +23,14 @@
         "symfony/config": "~2.8|~3.0|~4.0",
         "symfony/dependency-injection": "~3.4|~4.0",
         "symfony/intl": "^2.8.18|^3.2.5|~4.0",
-        "symfony/yaml": "~3.3|~4.0",
+        "symfony/yaml": "~3.4|~4.0",
         "symfony/finder": "~2.8|~3.0|~4.0",
         "psr/log": "~1.0"
     },
     "conflict": {
         "symfony/config": "<2.8",
         "symfony/dependency-injection": "<3.4",
-        "symfony/yaml": "<3.3"
+        "symfony/yaml": "<3.4"
     },
     "suggest": {
         "symfony/config": "",
diff --git a/src/Symfony/Component/Validator/Mapping/Loader/YamlFileLoader.php b/src/Symfony/Component/Validator/Mapping/Loader/YamlFileLoader.php
index ff6c65d05e763..e5e84c38c35dd 100644
--- a/src/Symfony/Component/Validator/Mapping/Loader/YamlFileLoader.php
+++ b/src/Symfony/Component/Validator/Mapping/Loader/YamlFileLoader.php
@@ -116,7 +116,7 @@ protected function parseNodes(array $nodes)
     private function parseFile($path)
     {
         try {
-            $classes = $this->yamlParser->parse(file_get_contents($path), Yaml::PARSE_CONSTANT);
+            $classes = $this->yamlParser->parseFile($path, Yaml::PARSE_CONSTANT);
         } catch (ParseException $e) {
             throw new \InvalidArgumentException(sprintf('The file "%s" does not contain valid YAML.', $path), 0, $e);
         }