diff --git a/basic-updates/base/rust-toolchain.toml b/basic-updates/base/rust-toolchain.toml
index 1966b4e..24238bd 100644
--- a/basic-updates/base/rust-toolchain.toml
+++ b/basic-updates/base/rust-toolchain.toml
@@ -1,4 +1,4 @@
 [toolchain]
-channel = "1.81.0"
+channel = "1.86.0"
 components = ["rustfmt"]
 targets = ["wasm32-unknown-unknown"]
diff --git a/basic-updates/base/src/lib.rs b/basic-updates/base/src/lib.rs
index 4b2b50b..d407bf1 100644
--- a/basic-updates/base/src/lib.rs
+++ b/basic-updates/base/src/lib.rs
@@ -7,6 +7,9 @@ use near_sdk::{env, AccountId, NearToken};
 
 const POINT_ONE: NearToken = NearToken::from_millinear(100);
 
+const MESSAGES_PREFIX: &[u8] = b"m";
+const PAYMENTS_PREFIX: &[u8] = b"p";
+
 #[near(serializers=[json, borsh])]
 pub struct PostedMessage {
     pub premium: bool,
@@ -23,8 +26,8 @@ pub struct GuestBook {
 impl Default for GuestBook {
     fn default() -> Self {
         Self {
-            messages: Vector::new(b"m"),
-            payments: Vector::new(b"p"),
+            messages: Vector::new(MESSAGES_PREFIX),
+            payments: Vector::new(PAYMENTS_PREFIX),
         }
     }
 }
diff --git a/basic-updates/update/src/lib.rs b/basic-updates/update/src/lib.rs
index b150340..67b8f1e 100644
--- a/basic-updates/update/src/lib.rs
+++ b/basic-updates/update/src/lib.rs
@@ -1,7 +1,7 @@
 use near_sdk::near;
 
 use near_sdk::collections::Vector;
-use near_sdk::json_types::{U64, U128};
+use near_sdk::json_types::{U128, U64};
 
 use near_sdk::{env, AccountId, NearToken};
 
@@ -9,6 +9,8 @@ mod migrate;
 
 const POINT_ONE: NearToken = NearToken::from_millinear(100);
 
+const MESSAGES_PREFIX: &[u8] = b"m";
+
 #[near(serializers=[json, borsh])]
 pub struct PostedMessage {
     pub payment: NearToken,
@@ -25,7 +27,7 @@ pub struct GuestBook {
 impl Default for GuestBook {
     fn default() -> Self {
         Self {
-            messages: Vector::new(b"m"),
+            messages: Vector::new(MESSAGES_PREFIX),
         }
     }
 }
diff --git a/basic-updates/update/src/migrate.rs b/basic-updates/update/src/migrate.rs
index d734536..1005471 100644
--- a/basic-updates/update/src/migrate.rs
+++ b/basic-updates/update/src/migrate.rs
@@ -19,25 +19,30 @@ impl GuestBook {
     #[init(ignore_state)]
     pub fn migrate() -> Self {
         // retrieve the current state from the contract
-        let old_state: OldState = env::state_read().expect("failed");
+        let mut old_state: OldState = env::state_read().expect("failed");
 
-        // iterate through the state migrating it to the new version
-        let mut new_messages: Vector<PostedMessage> = Vector::new(b"p");
+        // new messages vector to hold the migrated messages
+        let mut new_messages: Vector<PostedMessage> = Vector::new(MESSAGES_PREFIX);
 
+        // iterate through the state migrating it to the new version
         for (idx, posted) in old_state.messages.iter().enumerate() {
-            let payment = old_state
-                .payments
-                .get(idx as u64)
-                .unwrap_or(NearToken::from_near(0));
+            // get the payment and remove it from the old state payments vector so it won't be left in the new state
+            let payment = old_state.payments.get(idx as u64)
+                .expect("failed to get payment")
+                .clone();
 
+            // push the new message to the new messages vector
             new_messages.push(&PostedMessage {
                 payment,
                 premium: posted.premium,
-                sender: posted.sender,
-                text: posted.text,
+                sender: posted.sender.clone(),
+                text: posted.text.clone(),
             })
         }
 
+        // remove the payments from the old state
+        old_state.payments.clear();
+
         // return the new state
         Self {
             messages: new_messages,
diff --git a/basic-updates/update/tests/workspaces.rs b/basic-updates/update/tests/workspaces.rs
index ec475c1..7bf173d 100644
--- a/basic-updates/update/tests/workspaces.rs
+++ b/basic-updates/update/tests/workspaces.rs
@@ -23,7 +23,13 @@ async fn base_contract() -> Common {
     fs::create_dir_all("../../target/near/base").unwrap();
     let contract_wasm = near_workspaces::compile_project("../base").await.unwrap();
     let root = sandbox.root_account().unwrap();
-    let guest_book_account = root.create_subaccount("gbook").initial_balance(FIVE_NEAR).transact().await.unwrap().unwrap();
+    let guest_book_account = root
+        .create_subaccount("gbook")
+        .initial_balance(FIVE_NEAR)
+        .transact()
+        .await
+        .unwrap()
+        .unwrap();
 
     let contract = guest_book_account
         .deploy(&contract_wasm)
@@ -32,7 +38,13 @@ async fn base_contract() -> Common {
         .into_result()
         .unwrap();
 
-    let alice = root.create_subaccount("alice").initial_balance(FIVE_NEAR).transact().await.unwrap().unwrap();
+    let alice = root
+        .create_subaccount("alice")
+        .initial_balance(FIVE_NEAR)
+        .transact()
+        .await
+        .unwrap()
+        .unwrap();
 
     let guest_book_message_outcome = guest_book_account
         .call(contract.id(), "add_message")