diff --git a/requirements.txt b/requirements.txt
index b151fb90a7..085ff4f8ef 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -165,7 +165,7 @@ txtorcon==0.20.0
 typing-extensions==3.7.4.1
 typing-inspect==0.5.0
 u-msgpack-python==2.5.0
-ujson==1.35
+ujson==5.4.0
 urllib3==1.24.3
 watchdog==0.8.3
 web3==4.2.1
diff --git a/requirements_to-freeze.txt b/requirements_to-freeze.txt
index 2a0869e30c..afe9875edc 100644
--- a/requirements_to-freeze.txt
+++ b/requirements_to-freeze.txt
@@ -62,7 +62,7 @@ token_bucket==0.2.0
 transitions==0.7.2
 Twisted==19.7.0
 txaio==18.8.1
-ujson==1.35
+ujson==5.4.0
 urllib3==1.24.3
 web3==4.2.1
 zope.interface==4.4.2