diff --git a/Cargo.toml b/Cargo.toml
index e371290..64b17bf 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,7 +10,7 @@ license       = "Apache-2.0"
 name          = "sonic-rs"
 readme        = "README.md"
 repository    = "https://github.com/cloudwego/sonic-rs"
-version       = "0.3.17"
+version       = "0.4.0-rc1"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html