diff --git a/requirements.txt b/requirements.txt
index e6dc4f5..b2072ec 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 networkx==1.9
 r2pipe==0.9.5
 dill==0.2.7.1
-ujson==1.35
+ujson==5.2.0
 cmd2==0.7.9
 angr==7.7.9.14
 pygraphviz==1.3.1