diff --git a/chart/requirements.txt b/chart/requirements.txt
index 278ef87..105a064 100644
--- a/chart/requirements.txt
+++ b/chart/requirements.txt
@@ -1,5 +1,5 @@
 matplotlib~=3.9.1
-PyYAML~=6.0.1
+hjson~=3.1.0
 uvicorn~=0.29.0
 fastapi[standard]~=0.115.2
 starlette~=0.40.0