diff --git a/pyproject.toml b/pyproject.toml
index 5db523c5..4f9055cc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -32,6 +32,7 @@ dependencies = [
   "protobuf==6.31.1",
   "dijkstar==2.6.0",
   "lattica==1.0.9",
+  "orjson",
 ]
 
 [project.scripts]