diff --git a/src/connection.ts b/src/connection.ts
index 9b45eb4b92db..4da88bd6422a 100644
--- a/src/connection.ts
+++ b/src/connection.ts
@@ -884,6 +884,8 @@ export type TransactionResponse = {
 
 /**
  * A confirmed transaction on the ledger
+ *
+ * @deprecated Deprecated since Solana v1.8.0.
  */
 export type ConfirmedTransaction = {
   /** The slot during which the transaction was processed */
@@ -1013,7 +1015,9 @@ export type BlockResponse = {
 };
 
 /**
- * A ConfirmedBlock on the ledger
+ * A confirmed block on the ledger
+ *
+ * @deprecated Deprecated since Solana v1.8.0.
  */
 export type ConfirmedBlock = {
   /** Blockhash of this block */
diff --git a/src/fee-calculator.ts b/src/fee-calculator.ts
index f4caacf7d94f..eca886ac33bf 100644
--- a/src/fee-calculator.ts
+++ b/src/fee-calculator.ts
@@ -9,6 +9,8 @@ export const FeeCalculatorLayout = BufferLayout.nu64('lamportsPerSignature');
 
 /**
  * Calculator for transaction fees.
+ *
+ * @deprecated Deprecated since Solana v1.8.0.
  */
 export interface FeeCalculator {
   /** Cost in lamports to validate a signature. */