diff --git a/Cargo.toml b/Cargo.toml
index 8157ac7..baa61eb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "map-api"
 description = "Raft state machine"
-version = "0.2.0"
+version = "0.2.1"
 authors = ["Databend Authors <opensource@datafuselabs.com>"]
 license = "Apache-2.0"
 edition = "2021"
diff --git a/src/seq_value/update.rs b/src/seq_value/change.rs
similarity index 100%
rename from src/seq_value/update.rs
rename to src/seq_value/change.rs
diff --git a/src/seq_value/mod.rs b/src/seq_value/mod.rs
index 73fd4a0..7cf466b 100644
--- a/src/seq_value/mod.rs
+++ b/src/seq_value/mod.rs
@@ -18,13 +18,13 @@
 //! sequence number and optional metadata. These are used to track the ordering and
 //! lifecycle of values in storage systems.
 
+mod change;
 mod seq_value_trait;
 mod seqv;
-mod update;
 
+pub use change::Change;
 pub use seq_value_trait::SeqValue;
 pub use seqv::SeqV;
-pub use update::Change;
 
 #[deprecated(since = "0.2.0", note = "Use `Change` instead")]
 pub type Update<M, V = Vec<u8>> = Change<M, V>;