diff --git a/.cargo/config b/.cargo/config.toml
similarity index 100%
rename from .cargo/config
rename to .cargo/config.toml
diff --git a/Cargo.toml b/Cargo.toml
index 21d7fa6..b842399 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,7 +3,7 @@ categories = ["embedded", "no-std"]
 name = "enc424j600"
 description = "Embbeded Rust Ethernet driver for ENC424J600 Ethernet controller with SPI interface"
 authors = ["Harry Ho <hh@m-labs.hk>", "Dip Cheung <dc@m-labs.hk>"]
-version = "0.3.0"
+version = "0.4.0"
 keywords = ["ethernet", "eth", "enc424j600", "stm32", "stm32f4xx"]
 repository = "https://git.m-labs.hk/M-Labs/ENC424J600"
 edition = "2018"