diff --git a/.travis.yml b/.travis.yml
index 00141522..73f11408 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -19,11 +19,7 @@ matrix:
       env: COMPOSER_FLAGS="--prefer-lowest" SYMFONY_DEPRECATIONS_HELPER=weak
     # Test against Symfony LTS versions
     - php: 5.6
-      env: SYMFONY_VERSION="2.7.*"
-    - php: 5.6
-      env: SYMFONY_VERSION="2.8.*"
-    - php: 5.6
-      env: SYMFONY_VERSION="3.4.*" DEPENDENCIES=dev
+      env: SYMFONY_VERSION="3.4.*"
     - php: 7.0
     - php: 7.1
       # There is a bug in PHPUnit 5.7
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7ed1f3d2..5202a7ff 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
 * Fixed regression when `app` channel is defined explicitly
 * Fixed handlers marked as nested not being ignored properly from the stack
 * Added support for Redis configuration
+* Drop support for Symfony <3
 
 ## 3.3.1 (2018-11-04)
 
diff --git a/DependencyInjection/Compiler/DebugHandlerPass.php b/DependencyInjection/Compiler/DebugHandlerPass.php
index c950e150..06493173 100644
--- a/DependencyInjection/Compiler/DebugHandlerPass.php
+++ b/DependencyInjection/Compiler/DebugHandlerPass.php
@@ -31,10 +31,7 @@ class DebugHandlerPass implements CompilerPassInterface
 
     public function __construct(LoggerChannelPass $channelPass)
     {
-        // Trigger the deprecation only when using a Symfony version supporting the new feature (i.e. 3.2+)
-        if (class_exists('Symfony\Bridge\Monolog\Processor\DebugProcessor') && class_exists('Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\AddDebugLogProcessorPass')) {
-            @trigger_error('The '.__CLASS__.' class is deprecated since version 2.12 and will be removed in 4.0. Use AddDebugLogProcessorPass in FrameworkBundle instead.', E_USER_DEPRECATED);
-        }
+        @trigger_error('The '.__CLASS__.' class is deprecated since version 2.12 and will be removed in 4.0. Use AddDebugLogProcessorPass in FrameworkBundle instead.', E_USER_DEPRECATED);
 
         $this->channelPass = $channelPass;
     }
diff --git a/DependencyInjection/Compiler/LoggerChannelPass.php b/DependencyInjection/Compiler/LoggerChannelPass.php
index 6fccc79b..51a21d5e 100644
--- a/DependencyInjection/Compiler/LoggerChannelPass.php
+++ b/DependencyInjection/Compiler/LoggerChannelPass.php
@@ -126,12 +126,7 @@ protected function processChannels($configuration)
     protected function createLogger($channel, $loggerId, ContainerBuilder $container)
     {
         if (!in_array($channel, $this->channels)) {
-            if (class_exists('Symfony\Component\DependencyInjection\ChildDefinition')) {
-                $logger = new ChildDefinition('monolog.logger_prototype');
-            } else {
-                $logger = new DefinitionDecorator('monolog.logger_prototype');
-            }
-
+            $logger = new ChildDefinition('monolog.logger_prototype');
             $logger->replaceArgument(0, $channel);
             $container->setDefinition($loggerId, $logger);
             $this->channels[] = $channel;
diff --git a/DependencyInjection/MonologExtension.php b/DependencyInjection/MonologExtension.php
index ab8ca555..285e9b81 100644
--- a/DependencyInjection/MonologExtension.php
+++ b/DependencyInjection/MonologExtension.php
@@ -58,11 +58,6 @@ public function load(array $configs, ContainerBuilder $container)
 
             $container->setParameter('monolog.use_microseconds', $config['use_microseconds']);
 
-            // always autowire the main logger, require Symfony >= 2.8, < 3.3
-            if (!method_exists('Symfony\Component\DependencyInjection\ContainerBuilder', 'fileExists') && method_exists('Symfony\Component\DependencyInjection\Definition', 'addAutowiringType')) {
-                $container->getDefinition('monolog.logger')->addAutowiringType('Psr\Log\LoggerInterface');
-            }
-
             $handlers = array();
 
             foreach ($config['handlers'] as $name => $handler) {
diff --git a/composer.json b/composer.json
index 8b091ca8..f89cfa0c 100644
--- a/composer.json
+++ b/composer.json
@@ -17,15 +17,15 @@
     ],
     "require": {
         "php": ">=5.6",
-        "symfony/monolog-bridge": "~2.7|~3.3|~4.0",
-        "symfony/dependency-injection": "~2.7|~3.4.10|^4.0.10",
-        "symfony/config": "~2.7|~3.3|~4.0",
-        "symfony/http-kernel": "~2.7|~3.3|~4.0",
+        "symfony/monolog-bridge": "~3.4|~4.0",
+        "symfony/dependency-injection": "~3.4.10|^4.0.10",
+        "symfony/config": "~3.4|~4.0",
+        "symfony/http-kernel": "~3.4|~4.0",
         "monolog/monolog": "~1.22"
     },
     "require-dev": {
-        "symfony/yaml": "~2.7|~3.3|~4.0",
-        "symfony/console": "~2.7|~3.3|~4.0",
+        "symfony/yaml": "~3.4|~4.0",
+        "symfony/console": "~3.4|~4.0",
         "symfony/phpunit-bridge": "^3.4.19|^4.0"
     },
     "autoload": {