diff --git a/.travis.yml b/.travis.yml
index 316470c..a68aeac 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,11 +1,9 @@
 language: php
 
 php:
-  - 5.5
-  - 5.6
-  - 7.0
   - 7.1
   - 7.2
+  - 7.3
   - nightly
 
 sudo: false
diff --git a/composer.json b/composer.json
index 92d2825..787e02c 100644
--- a/composer.json
+++ b/composer.json
@@ -12,13 +12,14 @@
         }
     ],
     "require": {
-        "php": ">=5.5.9|^7.0",
+        "php": "^7.1",
         "lullabot/amp": "1.1.*",
-        "symfony/framework-bundle": "^3.0|^4.1",
-        "symfony/twig-bundle": "^3.0|^4.1"
+        "symfony/framework-bundle": "^3.4 || ^4.1",
+        "symfony/twig-bundle": "^3.4 || ^4.1"
     },
     "require-dev": {
-        "phpspec/phpspec": "^2.4"
+        "phpspec/phpspec": "^5.1",
+        "sebastian/comparator": "^3.0"
     },
     "autoload": {
         "exclude-from-classmap": [