diff --git a/core/Cargo.toml b/core/Cargo.toml
index 9d32d30..9856703 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -7,10 +7,6 @@ publish = false
 [dependencies]
 chrono = "^0.4"
 
-# serialization & deserialization
-serde = { version = "^1.0", features = ["derive"] }
-serde_json = "^1.0"
-
 portfolio-entity = { path = "../entity" }
 
 # env