diff --git a/requirements.txt b/requirements.txt
index 20dab584..1740eb75 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,6 +6,6 @@ Cython==0.29.32
 cyvcf2==0.30.16
 uvloop==0.16.0
 aiocache==0.11.1
-ujson==5.4.0
+ujson==5.5.0
 Authlib==1.0.1
 gunicorn==20.1.0
diff --git a/setup.py b/setup.py
index 26b2ae54..e914cac1 100644
--- a/setup.py
+++ b/setup.py
@@ -46,7 +46,7 @@
         "uvloop==0.16.0",
         "cyvcf2==0.30.16",
         "aiocache==0.11.1",
-        "ujson==5.4.0",
+        "ujson==5.5.0",
     ],
     extras_require={
         "vcf": [