diff --git a/CHANGELOG.md b/CHANGELOG.md
index fd77ce0..cf2a84a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,7 +9,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
-- Add the `Claude 3 Haiku` model.
+- Support `tokio::stream` for streaming API by optional.
+
+## [0.3.0] - 2024-03-14
+
+### Added
+
+- Add the Claude 3 Haiku model: `claude-3-haiku-20240307`.
 
 ## [0.2.0] - 2024-03-13
 
@@ -27,7 +33,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Add the `Create a Message` API.
 
-[unreleased]: https://github.com/mochi-neko/clust/compare/v0.2.0...HEAD
+[unreleased]: https://github.com/mochi-neko/clust/compare/v0.3.0...HEAD
+
+[0.3.0]: https://github.com/mochi-neko/clust/compare/v0.2.0...v0.3.0
 
 [0.2.0]: https://github.com/mochi-neko/clust/compare/v0.1.0...v0.2.0
 
diff --git a/Cargo.toml b/Cargo.toml
index 1f88cf1..2d0f9fe 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "clust"
-version = "0.2.0"
+version = "0.3.0"
 edition = "2021"
 authors = ["Mochineko <t.o.e.4315@gmail.com>"]
 rust-version = "1.76"
diff --git a/README.md b/README.md
index e08f564..72966bf 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ or add the following line to your Cargo.toml:
 
 ```toml
 [dependencies]
-clust = "0.2.0"
+clust = "0.3.0"
 ```
 
 ## Supported APIs
diff --git a/examples/create_a_message.rs b/examples/create_a_message.rs
index c1b9be3..af7369f 100644
--- a/examples/create_a_message.rs
+++ b/examples/create_a_message.rs
@@ -35,7 +35,7 @@ async fn main() -> anyhow::Result<()> {
     let client = Client::from_env()?;
 
     // 2. Create a request body.
-    let model = ClaudeModel::Claude3Sonnet20240229;
+    let model = ClaudeModel::Claude3Haiku20240307;
     let messages = vec![Message::user(
         arguments.message,
     )];
diff --git a/src/messages/claude_model.rs b/src/messages/claude_model.rs
index 59a9f08..ce9a2f9 100644
--- a/src/messages/claude_model.rs
+++ b/src/messages/claude_model.rs
@@ -13,7 +13,8 @@ pub enum ClaudeModel {
     /// Claude 3 Sonnet at 2024/02/29.
     Claude3Sonnet20240229,
     // Claude 3 Haiku
-    // Coming soon
+    /// Claude 3 Haiku at 2024/03/07.
+    Claude3Haiku20240307,
 }
 
 impl Default for ClaudeModel {
@@ -34,6 +35,9 @@ impl Display for ClaudeModel {
             | ClaudeModel::Claude3Sonnet20240229 => {
                 write!(f, "claude-3-sonnet-20240229")
             },
+            | ClaudeModel::Claude3Haiku20240307 => {
+                write!(f, "claude-3-haiku-20240307")
+            },
         }
     }
 }
@@ -43,6 +47,7 @@ impl ClaudeModel {
         match self {
             | ClaudeModel::Claude3Opus20240229 => 4096,
             | ClaudeModel::Claude3Sonnet20240229 => 4096,
+            | ClaudeModel::Claude3Haiku20240307 => 4096,
         }
     }
 }
@@ -50,7 +55,8 @@ impl ClaudeModel {
 impl_enum_string_serialization!(
     ClaudeModel,
     Claude3Opus20240229 => "claude-3-opus-20240229",
-    Claude3Sonnet20240229 => "claude-3-sonnet-20240229"
+    Claude3Sonnet20240229 => "claude-3-sonnet-20240229",
+    Claude3Haiku20240307 => "claude-3-haiku-20240307"
 );
 
 #[cfg(test)]
@@ -75,6 +81,10 @@ mod tests {
             ClaudeModel::Claude3Sonnet20240229.to_string(),
             "claude-3-sonnet-20240229"
         );
+        assert_eq!(
+            ClaudeModel::Claude3Haiku20240307.to_string(),
+            "claude-3-haiku-20240307"
+        );
     }
 
     #[test]
@@ -87,6 +97,10 @@ mod tests {
             ClaudeModel::Claude3Sonnet20240229.max_tokens(),
             4096
         );
+        assert_eq!(
+            ClaudeModel::Claude3Haiku20240307.max_tokens(),
+            4096
+        );
     }
 
     #[test]
@@ -101,6 +115,11 @@ mod tests {
                 .unwrap(),
             ClaudeModel::Claude3Sonnet20240229
         );
+        assert_eq!(
+            serde_json::from_str::<ClaudeModel>("\"claude-3-haiku-20240307\"")
+                .unwrap(),
+            ClaudeModel::Claude3Haiku20240307
+        );
     }
 
     #[test]
@@ -113,5 +132,9 @@ mod tests {
             serde_json::to_string(&ClaudeModel::Claude3Sonnet20240229).unwrap(),
             "\"claude-3-sonnet-20240229\""
         );
+        assert_eq!(
+            serde_json::to_string(&ClaudeModel::Claude3Haiku20240307).unwrap(),
+            "\"claude-3-haiku-20240307\""
+        );
     }
 }