diff --git a/requirements.txt b/requirements.txt
index f7491cd..1abbd89 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,5 +16,5 @@ termcolor==1.1.0
 thinc==6.10.2
 toolz==0.9.0
 tqdm==4.22.0
-ujson==1.35
+ujson==5.4.0
 wrapt==1.10.11