diff --git a/requirements.txt b/requirements.txt
index fb7747a..5755342 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -61,7 +61,7 @@ smart-open==1.7.1
 tornado==5.1.1
 tqdm==4.26.0
 twine==1.12.1
-ujson==1.35
+ujson==5.4.0
 urllib3==1.23
 uvloop==0.11.2
 webencodings==0.5.1