diff --git a/trace-protobuf/Cargo.toml b/trace-protobuf/Cargo.toml
index 157227b95..05b383de4 100644
--- a/trace-protobuf/Cargo.toml
+++ b/trace-protobuf/Cargo.toml
@@ -10,6 +10,8 @@ license.workspace = true
 prost = "0.11.6"
 serde = { version = "1.0.145", features = ["derive"] }
 serde_bytes = "0.11.9"
+
+[dev-dependencies]
 serde_json = "1.0.117"
 
 [build-dependencies]
diff --git a/trace-protobuf/src/pb_test.rs b/trace-protobuf/src/pb_test.rs
index 824cf6ba4..65fe50542 100644
--- a/trace-protobuf/src/pb_test.rs
+++ b/trace-protobuf/src/pb_test.rs
@@ -3,8 +3,8 @@
 
 #[cfg(test)]
 mod tests {
-    use serde_json;
     use crate::pb::{is_default, Span};
+    use serde_json;
 
     #[test]
     fn test_is_default() {