diff --git a/.travis.yml b/.travis.yml
index 357e762..a8f018e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,14 +1,16 @@
 language: php
 
 php:
-- 5.6
-- 7.0
 - 7.1
 - 7.2
 
 before_script:
 - composer install
 
+cache:
+  directories:
+  - $HOME/.composer/cache/files
+
 script:
 - vendor/bin/php-cs-fixer fix --dry-run --diff
 - vendor/bin/phpunit --configuration phpunit.xml.dist
\ No newline at end of file
diff --git a/composer.json b/composer.json
index 0c9e8ca..d95b2ee 100755
--- a/composer.json
+++ b/composer.json
@@ -11,8 +11,7 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^5.0",
-        "doctrine/annotations": "1.4.0",
-        "friendsofphp/php-cs-fixer": "^2.13.1"
+        "friendsofphp/php-cs-fixer": "^2.13"
     },
     "authors": [
         {
diff --git a/composer.lock b/composer.lock
index 789ecf9..16b421f 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,34 +4,34 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "c853fd537687a9c26b6dd6bad058349b",
+    "content-hash": "a0e4f822c8b8a46881e4b97cd649f9ff",
     "packages": [
         {
             "name": "doctrine/annotations",
-            "version": "v1.4.0",
+            "version": "v1.6.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/doctrine/annotations.git",
-                "reference": "54cacc9b81758b14e3ce750f205a393d52339e97"
+                "reference": "c7f2050c68a9ab0bdb0f98567ec08d80ea7d24d5"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/doctrine/annotations/zipball/54cacc9b81758b14e3ce750f205a393d52339e97",
-                "reference": "54cacc9b81758b14e3ce750f205a393d52339e97",
+                "url": "https://api.github.com/repos/doctrine/annotations/zipball/c7f2050c68a9ab0bdb0f98567ec08d80ea7d24d5",
+                "reference": "c7f2050c68a9ab0bdb0f98567ec08d80ea7d24d5",
                 "shasum": ""
             },
             "require": {
                 "doctrine/lexer": "1.*",
-                "php": "^5.6 || ^7.0"
+                "php": "^7.1"
             },
             "require-dev": {
                 "doctrine/cache": "1.*",
-                "phpunit/phpunit": "^5.7"
+                "phpunit/phpunit": "^6.4"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.4.x-dev"
+                    "dev-master": "1.6.x-dev"
                 }
             },
             "autoload": {
@@ -72,7 +72,7 @@
                 "docblock",
                 "parser"
             ],
-            "time": "2017-02-24T16:22:25+00:00"
+            "time": "2017-12-06T07:11:42+00:00"
         },
         {
             "name": "doctrine/instantiator",