diff --git a/requirements.txt b/requirements.txt
index f219720..7aa8bfd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 med2image
-ujson==1.35
+ujson==5.4.0
 nibabel==2.3.1
 pybids==0.6.5
 nipype==1.1.5