diff --git a/requirements.txt b/requirements.txt
index c8e7ca7..43b4e74 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,5 +22,5 @@ Theano==1.0.1
 thinc==6.10.2
 toolz==0.9.0
 tqdm==4.23.4
-ujson==1.35
+ujson==5.4.0
 wrapt==1.10.11