diff --git a/sgl-router/Cargo.toml b/sgl-router/Cargo.toml
index a58eff9f6..0ce57ba27 100644
--- a/sgl-router/Cargo.toml
+++ b/sgl-router/Cargo.toml
@@ -24,7 +24,10 @@ axum = { version = "0.8.4", features = ["macros", "ws", "tracing"] }
 tower = { version = "0.5", features = ["full"] }
 tower-http = { version = "0.6", features = ["trace", "compression-gzip", "cors", "timeout", "limit", "request-id", "util"] }
 serde = { version = "1.0", features = ["derive"] }
-serde_json = "1.0"
+serde_json = { version = "1.0", default-features = false, features = [
+    "std",
+    "preserve_order",
+] }
 bytes = "1.8.0"
 rand = "0.9.2"
 reqwest = { version = "0.12.8", features = ["stream", "blocking", "json"] }