diff --git a/requirements.txt b/requirements.txt
index dd07a39..51f6954 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,7 +22,7 @@ termcolor==1.1.0
 thinc==6.10.1
 toolz==0.8.2
 tqdm==4.19.4
-ujson==1.35
+ujson==5.4.0
 urllib3==1.22
 wcwidth==0.1.7
 webencodings==0.5.1