diff --git a/requirements.txt b/requirements.txt
index 8d09f1c..3598575 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,4 +4,4 @@ lockfile==0.12.2
 pymongo==3.3
 python-dateutil==2.7.*
 requests==2.20.*
-ujson==1.35
+ujson==5.4.0
diff --git a/setup.py b/setup.py
index 7dc9d25..463fdf1 100644
--- a/setup.py
+++ b/setup.py
@@ -29,7 +29,7 @@ def read(filename):
         "pymongo==3.3",
         "python-dateutil==2.7.*",
         "requests==2.20.*",
-        "ujson==1.35",
+        "ujson==5.4.0",
     ],
     classifiers=[
         "Development Status :: 5 - Production/Stable",