diff --git a/mine-your-first-block/Cargo.toml b/mine-your-first-block/Cargo.toml
index 7418716..8ea6bdd 100644
--- a/mine-your-first-block/Cargo.toml
+++ b/mine-your-first-block/Cargo.toml
@@ -6,7 +6,9 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+ripemd = "0.1.3"
 secp256k1 = "0.28.2"
 serde = { version = "1.0.197", features = ["derive"] }
 serde_json = "1.0.114"
 sha2 = "0.10.8"
+hex = "0.4.3"