diff --git a/Cargo.toml b/Cargo.toml
index b3aba57..1ef05c9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "ckb-std"
-version = "0.2.1"
+version = "0.2.2"
 authors = ["jjy <jjyruby@gmail.com>"]
 edition = "2018"
 license = "MIT"