diff --git a/composer.json b/composer.json
index 2978fa5..53909c4 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,7 @@
         }
     ],
     "require": {
-        "php": ">=5.3.0"
+        "php": "^7.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/src/CacheException.php b/src/CacheException.php
index eba5381..f61b24c 100644
--- a/src/CacheException.php
+++ b/src/CacheException.php
@@ -5,6 +5,6 @@
 /**
  * Interface used for all types of exceptions thrown by the implementing library.
  */
-interface CacheException
+interface CacheException extends \Throwable
 {
 }