diff --git a/requirements.txt b/requirements.txt
index bac98a6..52a7e3d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 icalendar       == 3.8.4
 requests        == 2.5.1
 requests-cache  == 0.4.8
-ujson           == 1.33
+ujson           == 5.4.0