diff --git a/.travis.yml b/.travis.yml
index ab158b7..6feb0a2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,7 @@
 language: php
 
 php:
+  - 5.3
   - 5.4
   - 5.5
   - 5.6
diff --git a/composer.json b/composer.json
index bb3031e..b80c88b 100644
--- a/composer.json
+++ b/composer.json
@@ -4,8 +4,8 @@
     "keywords": ["cache"],
     "license": "MIT",
     "require": {
-        "php": ">=5.4.0",
-        "react/promise": "~2.0"
+        "php": ">=5.3.0",
+        "react/promise": "~2.0|~1.1"
     },
     "autoload": {
         "psr-4": { "React\\Cache\\": "src\\" }