set specific dependency version

Cargo.toml

@@ -10,14 +10,14 @@ edition = "2021"
 [dependencies]
 hdk = "0.4.0-dev.5"
 holo_hash = { version = "0.4.0-dev.5", features = ["encoding"] }
-paste = "*"
-serde = "*"
+paste = "1.0.15"
+serde = "1.0.203"
 thiserror = "1"
 mockall = "0.9"
 fixt = { version = "0.4.0-dev.2", optional = true }
 mockall_double = { version = "0.2.0", optional = true }
 # specific so as to avoid wasm-bindgen dependency
-chrono = { version = "*", default-features = false, features = ["clock", "std", "oldtime", "serde"] }
+chrono = { version = "0.4.38", default-features = false, features = ["clock", "std", "oldtime", "serde"] }
 assert_matches = "1.5.0"
 holochain_types = { version = "0.4.0-dev.5", optional = true }