Add the following changes in your contact Cargo.toml
[dependencies]
ink = { version ="4.0.0-alpha.3", default-features = false }
ethabi = { path = "../ethabi", default-features = false }
hex = { version = "0.4.3", default-features = false }
scale = { package = "parity-scale-codec", version = "3.2.1", default-features = false, features = ["derive"] }
scale-info = { version = "2", default-features = false, features = ["derive"], optional = true }
[profile.release]
overflow-checks = false
Earlier it was as following
[dependencies]
ink = { version ="4.0.0-alpha.3", default-features = false }
ethabi = { path = "../ethabi" }
hex = { version = "0.4.3" }
scale = { package = "parity-scale-codec", version = "3.2.1", default-features = false, features = ["derive"] }
scale-info = { version = "2", default-features = false, features = ["derive"], optional = true }