diff --git a/requirements.txt b/requirements.txt
index 3e99b51..2ff3816 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 Flask==1.0.2
 leveldb==0.194
 gunicorn==19.9.0
-ujson==1.35
+ujson==5.2.0
 gevent==1.3.7
diff --git a/setup.py b/setup.py
index 87f71e4..a86d2a4 100644
--- a/setup.py
+++ b/setup.py
@@ -4,7 +4,7 @@
     'flask==1.0.2',
     'leveldb==0.194',
     'gevent==1.3.7',
-    'ujson==1.35',
+    'ujson==5.2.0',
 ]