diff --git a/caldera/requirements.txt b/caldera/requirements.txt
index 623ea3fa7..5fcdecc5c 100644
--- a/caldera/requirements.txt
+++ b/caldera/requirements.txt
@@ -21,7 +21,7 @@ PyYAML==3.12
 requests==2.18.4
 six==1.11.0
 toolz==0.9.0
-ujson==1.35
+ujson==5.2.0
 unification==0.2.2
 urllib3==1.22
 yarl==1.0.0