diff --git a/.travis.yml b/.travis.yml
index f25de0f..0b009d1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,8 +3,6 @@ sudo: false
 language: php
 
 php:
-  - 5.3
-  - 5.4
   - 5.5
   - 5.6
   - 7.0
@@ -17,7 +15,7 @@ env:
 matrix:
   fast_finish: true
   include:
-    - php: 5.3
+    - php: 5.5
       env: deps=low
     - php: 5.6
       env: deps=high
diff --git a/composer.json b/composer.json
index 1ccb77a..f0d3210 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
     }
   },
   "require":      {
-    "php": ">= 5.3.3",
+    "php": ">= 5.5",
     "doctrine/lexer": "~1.0,>=1.0.1"
   },
   "require-dev" :   {
diff --git a/composer.lock b/composer.lock
index 49f7df8..25e80f8 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1,10 +1,10 @@
 {
     "_readme": [
         "This file locks the dependencies of your project to a known state",
-        "Read more about it at http://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "hash": "9426f5a00cf0f71d83c287a7c0ff392b",
+    "hash": "eaf5eb6f0b3811e996fb205760c9dd3f",
     "packages": [
         {
             "name": "doctrine/lexer",
@@ -1492,7 +1492,7 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": ">= 5.3.3"
+        "php": ">= 5.5"
     },
     "platform-dev": []
 }