diff --git a/.travis.yml b/.travis.yml
index ec234cb9c..19bc5a4fe 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -27,9 +27,6 @@ script: ./vendor/bin/simple-phpunit
 jobs:
     fast_finish: true
     include:
-        - php: 5.4
-        - php: 5.4
-          env: TWIG_EXT=yes
         - php: 5.5
         - php: 5.5
           env: TWIG_EXT=yes
diff --git a/CHANGELOG b/CHANGELOG
index ff4e92f8e..a200db156 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -2,6 +2,7 @@
 
  * fixed the "empty" test on Traversable instances
  * fixed cache when opcache is installed but disabled
+ * upgrade minimal php version to 5.5
 
 * 1.42.2 (2019-06-18)
 
diff --git a/composer.json b/composer.json
index be72014d9..9f56365f8 100644
--- a/composer.json
+++ b/composer.json
@@ -24,7 +24,7 @@
         }
     ],
     "require": {
-        "php": ">=5.4.0",
+        "php": ">=5.5.0",
         "symfony/polyfill-ctype": "^1.8"
     },
     "require-dev": {
diff --git a/doc/intro.rst b/doc/intro.rst
index d1f9c59e8..1f52c80a8 100644
--- a/doc/intro.rst
+++ b/doc/intro.rst
@@ -26,7 +26,7 @@ Slim, Yii, Laravel, and Codeigniter — just to name a few.
 Prerequisites
 -------------
 
-Twig needs at least **PHP 5.4.0** to run.
+Twig needs at least **PHP 5.5.0** to run.
 
 Installation
 ------------
diff --git a/tests/NodeVisitor/OptimizerTest.php b/tests/NodeVisitor/OptimizerTest.php
index d7bd1e98e..49dbbb264 100644
--- a/tests/NodeVisitor/OptimizerTest.php
+++ b/tests/NodeVisitor/OptimizerTest.php
@@ -41,21 +41,6 @@ class OptimizerTest extends \PHPUnit\Framework\TestCase
         $this->assertTrue($node->getAttribute('output'));
     }
 
-    public function testRenderVariableBlockOptimizer()
-    {
-        if (\PHP_VERSION_ID >= 50400) {
-            $this->markTestSkipped('not needed on PHP >= 5.4');
-        }
-
-        $env = new Environment($this->getMockBuilder('\Twig\Loader\LoaderInterface')->getMock(), ['cache' => false, 'autoescape' => false]);
-        $stream = $env->parse($env->tokenize(new Source('{{ block(name|lower) }}', 'index')));
-
-        $node = $stream->getNode('body')->getNode(0)->getNode(1);
-
-        $this->assertInstanceOf('\Twig\Node\Expression\BlockReferenceExpression', $node);
-        $this->assertTrue($node->getAttribute('output'));
-    }
-
     /**
      * @dataProvider getTestsForForOptimizer
      */