diff --git a/1_D_jak_deploy/web_app/requirements.txt b/1_D_jak_deploy/web_app/requirements.txt
index 4998229..a6adace 100644
--- a/1_D_jak_deploy/web_app/requirements.txt
+++ b/1_D_jak_deploy/web_app/requirements.txt
@@ -25,7 +25,7 @@ requests==2.23.0
 Rx==1.6.1
 six==1.14.0
 starlette==0.13.2
-ujson==2.0.2
+ujson==5.4.0
 urllib3==1.25.8
 uvicorn==0.11.3
 uvloop==0.14.0