diff --git a/core/Cargo.toml b/core/Cargo.toml
index ad9a9b0..1927fee 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -5,6 +5,7 @@ edition = "2021"
 
 [dependencies]
 serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
 portfolio-entity = { path = "../entity" }
 rand = "0.8.5"
 argon2 = "0.4.1"
@@ -21,7 +22,4 @@ features = [
 ]
 
 [dev-dependencies]
-tokio = "1.21.2"
-
-[features]
-mock = ["sea-orm/mock"]
+tokio = "1.21.2"
\ No newline at end of file