1 files changed, 1 insertions, 0 deletions
diff --git a/composer.json b/composer.json
index b061194..507d5d2 100644
--- a/composer.json
+++ b/composer.json
@@ -7,6 +7,7 @@
     "require" : {
         "php"          : ">=5.4",
         "ext-mbstring" : "*",
+        "ext-ctype"    : "*",
         "sabre/event"  : ">=1.0.0,<4.0.0",
         "sabre/uri"    : "~1.0"
     },