diff --git a/requirements/development.txt b/requirements/development.txt
index 4142d01c..8455b473 100644
--- a/requirements/development.txt
+++ b/requirements/development.txt
@@ -11,6 +11,6 @@ tox==3.12.1
 wheel
 pytest-xdist==1.29.0
 marshmallow==2.18.1
-ujson==1.35
+ujson==5.4.0
 numpy<1.16