diff --git a/requirements.txt b/requirements.txt
index 16dbb67..e3e251c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -81,7 +81,7 @@ toposort==1.5
 tornado==6.0.3
 tqdm==4.36.1
 typed-ast==1.4.0
-ujson==1.35
+ujson==5.2.0
 urllib3==1.24.2
 wcwidth==0.1.7
 webencodings==0.5.1