diff --git a/.travis.yml b/.travis.yml
index 4446b13..ab0e888 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,6 @@
 language: php
 
 php:
-  - 5.6
-  - 7.0
   - 7.1
   - 7.2
   - nightly
@@ -12,9 +10,7 @@ matrix:
   fast_finish: true
   include:
     - php: '7.1'
-      env: YAML_VERSION="~2.3.0"
-    - php: '7.1'
-      env: YAML_VERSION="~2.7.0"
+      env: YAML_VERSION="^2.8"
     - php: '7.1'
       env: YAML_VERSION="^3.0"
     - php: '7.1'
diff --git a/composer.json b/composer.json
index c28bf55..52e54bc 100644
--- a/composer.json
+++ b/composer.json
@@ -11,8 +11,8 @@
         }
     ],
     "require": {
-        "php": "^5.6||^7.0",
-        "symfony/yaml": "^2.3||^3.0|^4.0",
+        "php": "^7.1",
+        "symfony/yaml": "^2.8||^3.0|^4.0",
         "doctrine/common": "^2.6",
         "jms/metadata": "^1.5"
     },