diff --git a/composer.json b/composer.json
index 8a586c1..401617b 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
 		"php": ">=5.3.2",
 		"silverstripe/framework": ">=3.1",
 		"silverstripe/cms": ">=3.1",
-		"johngrogg/ics-parser" : "*"
+		"johngrogg/ics-parser" : "1.0.3"
 	},
 	"support": {
 		"issues": "https://github.com/unclecheese/silverstripe-event-calendar/issues"