diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index d5834e2..48a576c 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,7 +1,7 @@
 [toolchain]
 # For deploy
-channel = "1.81.0"
+# channel = "1.81.0"
 # For develop and test
-# channel = "stable"
+channel = "stable"
 components = ["rustfmt"]
 targets = ["wasm32-unknown-unknown"]
diff --git a/src/lib.rs b/src/lib.rs
index 86e5d76..ed5205a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,9 +1,5 @@
 // Find all our documentation at https://docs.near.org
-use near_sdk::borsh::{BorshDeserialize, BorshSerialize};
-use near_sdk::json_types::U128;
-use near_sdk::serde::{Deserialize, Serialize};
-use near_sdk::{log, near, near_bindgen, require, PanicOnDefault};
-use schemars::JsonSchema;
+use near_sdk::{json_types::U128, log, near, near_bindgen, require, PanicOnDefault};
 use uint::construct_uint;
 
 construct_uint! {
@@ -11,8 +7,7 @@ construct_uint! {
     pub struct U256(4);
 }
 
-#[derive(Deserialize, Serialize, JsonSchema)]
-#[serde(crate = "near_sdk::serde")]
+#[near(serializers = [json, borsh])]
 pub struct BasicReturnObject {
     pub greeting: String,
     pub number: u8,
@@ -28,8 +23,8 @@ pub(crate) fn proportional(amount: u128, numerator: u128, denominator: u128) ->
 }
 
 // Define the contract structure
-#[near_bindgen]
-#[derive(BorshDeserialize, BorshSerialize, PanicOnDefault)]
+#[near(contract_state)]
+#[derive(PanicOnDefault)]
 pub struct NearTutorialContract {
     greeting: String,
 }