diff --git a/.travis.yml b/.travis.yml
index 137bd7d0..7b16abd3 100755
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,7 @@ php:
   # using major version aliases
 
   # aliased to a recent 5.3.x version
-  - 5.3
+  # - 5.3
   # aliased to a recent 5.4.x version
   - 5.4
   # aliased to a recent 5.5.x version
diff --git a/composer.json b/composer.json
index 8a3a2f16..88f6675c 100755
--- a/composer.json
+++ b/composer.json
@@ -18,6 +18,9 @@
         "psr-4": {
         	"Overtrue\\Pinyin\\": "src/"
         }
+    },
+    "require": {
+        "php":">=5.4.0"
     },
 	"require-dev": {
 		"phpunit/phpunit": "~4.8"