diff --git a/UPGRADE-3.4.md b/UPGRADE-3.4.md
index 6858520efe..e1c4af06c6 100644
--- a/UPGRADE-3.4.md
+++ b/UPGRADE-3.4.md
@@ -26,6 +26,12 @@ FrameworkBundle
  * The `KernelTestCase::getPhpUnitXmlDir()` and `KernelTestCase::getPhpUnitCliConfigArgument()` 
    methods are deprecated since 3.4 and will be removed in 4.0.
 
+Process
+-------
+
+ * The `Symfony\Component\Process\ProcessBuilder` class has been deprecated,
+   use the `Symfony\Component\Process\Process` class directly instead.
+
 Validator
 ---------
 
diff --git a/UPGRADE-4.0.md b/UPGRADE-4.0.md
index 27cbc04fe0..fce693437f 100644
--- a/UPGRADE-4.0.md
+++ b/UPGRADE-4.0.md
@@ -420,6 +420,9 @@ Ldap
 Process
 -------
 
+ * The `Symfony\Component\Process\ProcessBuilder` class has been removed,
+   use the `Symfony\Component\Process\Process` class directly instead.
+
  * The `ProcessUtils::escapeArgument()` method has been removed, use a command line array or give env vars to the `Process::start/run()` method instead.
 
  * Environment variables are always inherited in sub-processes.
diff --git a/src/Symfony/Bundle/WebServerBundle/WebServer.php b/src/Symfony/Bundle/WebServerBundle/WebServer.php
index b65cec1cb7..8edbe2bf56 100644
--- a/src/Symfony/Bundle/WebServerBundle/WebServer.php
+++ b/src/Symfony/Bundle/WebServerBundle/WebServer.php
@@ -13,7 +13,6 @@ namespace Symfony\Bundle\WebServerBundle;
 
 use Symfony\Component\Process\PhpExecutableFinder;
 use Symfony\Component\Process\Process;
-use Symfony\Component\Process\ProcessBuilder;
 use Symfony\Component\Process\Exception\RuntimeException;
 
 /**
@@ -151,11 +150,11 @@ class WebServer
             throw new \RuntimeException('Unable to find the PHP binary.');
         }
 
-        $builder = new ProcessBuilder(array($binary, '-S', $config->getAddress(), $config->getRouter()));
-        $builder->setWorkingDirectory($config->getDocumentRoot());
-        $builder->setTimeout(null);
+        $process = new Process(array($binary, '-S', $config->getAddress(), $config->getRouter()));
+        $process->setWorkingDirectory($config->getDocumentRoot());
+        $process->setTimeout(null);
 
-        return $builder->getProcess();
+        return $process;
     }
 
     private function getDefaultPidFile()
diff --git a/src/Symfony/Bundle/WebServerBundle/composer.json b/src/Symfony/Bundle/WebServerBundle/composer.json
index 306b0deffe..e1870b70d0 100644
--- a/src/Symfony/Bundle/WebServerBundle/composer.json
+++ b/src/Symfony/Bundle/WebServerBundle/composer.json
@@ -19,7 +19,7 @@
         "php": ">=5.5.9",
         "symfony/console": "~2.8.8|~3.0.8|~3.1.2|~3.2|~4.0",
         "symfony/http-kernel": "~3.3|~4.0",
-        "symfony/process": "~2.8|~3.0|~4.0"
+        "symfony/process": "~3.3|~4.0"
     },
     "autoload": {
         "psr-4": { "Symfony\\Bundle\\WebServerBundle\\": "" },
diff --git a/src/Symfony/Component/Console/Helper/ProcessHelper.php b/src/Symfony/Component/Console/Helper/ProcessHelper.php
index 2c46a2c39d..5010607511 100644
--- a/src/Symfony/Component/Console/Helper/ProcessHelper.php
+++ b/src/Symfony/Component/Console/Helper/ProcessHelper.php
@@ -15,7 +15,6 @@ use Symfony\Component\Console\Output\ConsoleOutputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Process\Exception\ProcessFailedException;
 use Symfony\Component\Process\Process;
-use Symfony\Component\Process\ProcessBuilder;
 
 /**
  * The ProcessHelper class provides helpers to run external processes.
@@ -45,7 +44,7 @@ class ProcessHelper extends Helper
         $formatter = $this->getHelperSet()->get('debug_formatter');
 
         if (is_array($cmd)) {
-            $process = ProcessBuilder::create($cmd)->getProcess();
+            $process = new Process($cmd);
         } elseif ($cmd instanceof Process) {
             $process = $cmd;
         } else {
diff --git a/src/Symfony/Component/Console/Tests/Helper/ProcessHelperTest.php b/src/Symfony/Component/Console/Tests/Helper/ProcessHelperTest.php
index 8069bcccc9..eb619539ee 100644
--- a/src/Symfony/Component/Console/Tests/Helper/ProcessHelperTest.php
+++ b/src/Symfony/Component/Console/Tests/Helper/ProcessHelperTest.php
@@ -17,7 +17,6 @@ use Symfony\Component\Console\Helper\HelperSet;
 use Symfony\Component\Console\Output\StreamOutput;
 use Symfony\Component\Console\Helper\ProcessHelper;
 use Symfony\Component\Process\Process;
-use Symfony\Component\Process\ProcessBuilder;
 
 class ProcessHelperTest extends TestCase
 {
@@ -85,8 +84,8 @@ EOT;
 EOT;
 
         $errorMessage = 'An error occurred';
-        $args = new ProcessBuilder(array('php', '-r', 'echo 42;'));
-        $args = $args->getProcess()->getCommandLine();
+        $args = new Process(array('php', '-r', 'echo 42;'));
+        $args = $args->getCommandLine();
         $successOutputProcessDebug = str_replace("'php' '-r' 'echo 42;'", $args, $successOutputProcessDebug);
 
         return array(
diff --git a/src/Symfony/Component/Console/composer.json b/src/Symfony/Component/Console/composer.json
index 9af71348cc..5f7fe6ec1a 100644
--- a/src/Symfony/Component/Console/composer.json
+++ b/src/Symfony/Component/Console/composer.json
@@ -26,7 +26,7 @@
         "symfony/event-dispatcher": "~2.8|~3.0|~4.0",
         "symfony/dependency-injection": "~3.3|~4.0",
         "symfony/filesystem": "~2.8|~3.0|~4.0",
-        "symfony/process": "~2.8|~3.0|~4.0",
+        "symfony/process": "~3.3|~4.0",
         "psr/log": "~1.0"
     },
     "suggest": {
@@ -36,7 +36,8 @@
         "psr/log": "For using the console logger"
     },
     "conflict": {
-        "symfony/dependency-injection": "<3.3"
+        "symfony/dependency-injection": "<3.3",
+        "symfony/process": "<3.3"
     },
     "autoload": {
         "psr-4": { "Symfony\\Component\\Console\\": "" },
diff --git a/src/Symfony/Component/Process/CHANGELOG.md b/src/Symfony/Component/Process/CHANGELOG.md
index bb719be711..7193c498d4 100644
--- a/src/Symfony/Component/Process/CHANGELOG.md
+++ b/src/Symfony/Component/Process/CHANGELOG.md
@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+3.4.0
+-----
+
+ * deprecated the ProcessBuilder class
+
 3.3.0
 -----
 
diff --git a/src/Symfony/Component/Process/ProcessBuilder.php b/src/Symfony/Component/Process/ProcessBuilder.php
index 2a5bb2bc3f..5a54689875 100644
--- a/src/Symfony/Component/Process/ProcessBuilder.php
+++ b/src/Symfony/Component/Process/ProcessBuilder.php
@@ -11,6 +11,8 @@
 
 namespace Symfony\Component\Process;
 
+@trigger_error(sprintf('The %s class is deprecated since version 3.4 and will be removed in 4.0. Use the Process class instead.', ProcessBuilder::class), E_USER_DEPRECATED);
+
 use Symfony\Component\Process\Exception\InvalidArgumentException;
 use Symfony\Component\Process\Exception\LogicException;
 
@@ -18,6 +20,8 @@ use Symfony\Component\Process\Exception\LogicException;
  * Process builder.
  *
  * @author Kris Wallsmith <kris@symfony.com>
+ *
+ * @deprecated since version 3.4, to be removed in 4.0. Use the Process class instead.
  */
 class ProcessBuilder
 {
@@ -120,13 +124,9 @@ class ProcessBuilder
      * @param bool $inheritEnv
      *
      * @return $this
-     *
-     * @deprecated since version 3.3, to be removed in 4.0.
      */
     public function inheritEnvironmentVariables($inheritEnv = true)
     {
-        @trigger_error(sprintf('The %s() method is deprecated since version 3.3 and will be removed in 4.0.', __METHOD__), E_USER_DEPRECATED);
-
         $this->inheritEnv = $inheritEnv;
 
         return $this;
@@ -221,13 +221,9 @@ class ProcessBuilder
      * @param string $value The option value
      *
      * @return $this
-     *
-     * @deprecated since version 3.3, to be removed in 4.0.
      */
     public function setOption($name, $value)
     {
-        @trigger_error(sprintf('The %s() method is deprecated since version 3.3 and will be removed in 4.0.', __METHOD__), E_USER_DEPRECATED);
-
         $this->options[$name] = $value;
 
         return $this;
diff --git a/src/Symfony/Component/Process/Tests/ProcessBuilderTest.php b/src/Symfony/Component/Process/Tests/ProcessBuilderTest.php
index 34bb373272..c1a67afa18 100644
--- a/src/Symfony/Component/Process/Tests/ProcessBuilderTest.php
+++ b/src/Symfony/Component/Process/Tests/ProcessBuilderTest.php
@@ -14,11 +14,11 @@ namespace Symfony\Component\Process\Tests;
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Process\ProcessBuilder;
 
+/**
+ * @group legacy
+ */
 class ProcessBuilderTest extends TestCase
 {
-    /**
-     * @group legacy
-     */
     public function testInheritEnvironmentVars()
     {
         $proc = ProcessBuilder::create()