diff --git a/packages/xrpl/src/models/common/index.ts b/packages/xrpl/src/models/common/index.ts
index 3a60588f96..d9ebc7fe7a 100644
--- a/packages/xrpl/src/models/common/index.ts
+++ b/packages/xrpl/src/models/common/index.ts
@@ -54,6 +54,7 @@ export interface Memo {
 }
 
 export type StreamType =
+  | 'book_changes'
   | 'consensus'
   | 'ledger'
   | 'manifests'
diff --git a/packages/xrpl/src/models/methods/subscribe.ts b/packages/xrpl/src/models/methods/subscribe.ts
index 38b3565d7a..ff7f0a2714 100644
--- a/packages/xrpl/src/models/methods/subscribe.ts
+++ b/packages/xrpl/src/models/methods/subscribe.ts
@@ -92,6 +92,87 @@ interface BaseStream {
   type: string
 }
 
+/**
+ * The book_changes stream sends bookChanges messages whenever a new ledger
+ * is validated. This message contains a summary of all changes to order books
+ * in the decentralized exchange that occurred in that ledger.
+ *
+ * @category Streams
+ */
+export interface BookChangesStream extends BaseStream {
+  type: 'bookChanges'
+  /** The ledger index of the ledger with these changes. */
+  ledger_index: number
+  /** The identifying hash of the ledger with these changes. */
+  ledger_hash: string
+  /**
+   * The official close time of the ledger with these changes,
+   * in seconds since the Ripple Epoch.
+   */
+  ledger_time: number
+  /**
+   * List of Book Update Objects, containing one entry for each order book
+   * that was updated in this ledger version. The array is empty if no
+   * order books were updated.
+   */
+  changes: BookUpdateObject[]
+}
+
+/**
+ * A Book Update Object represents the changes to a single order book
+ * in a single ledger version.
+ *
+ * @category Streams
+ */
+export interface BookUpdateObject {
+  /**
+   * An identifier for the first of the two currencies in the order book.
+   * For XRP, this is the string "XRP_drops". For tokens, this is formatted as
+   * the address of the issuer in base58, followed by a forward-slash ("/"),
+   * followed by the Currency Code for the token, which can be a 3-character
+   * standard code or a 20-character hexadecimal code.
+   */
+  currency_a: string
+  /**
+   * An identifier for the second of two currencies in the order book.
+   * This is in the same format as currency_a, except currency_b can never be XRP.
+   */
+  currency_b: string
+  /**
+   * The total amount, or volume, of the first currency (that is, currency_a)
+   * that moved as a result of trades through this order book in this ledger.
+   */
+  volume_a: string
+  /**
+   * The volume of the second currency (that is, currency_b) that moved
+   * as a result of trades through this order book in this ledger.
+   */
+  volume_b: string
+  /**
+   * The highest exchange rate among all offers matched in this ledger,
+   * as a ratio of the first currency to the second currency.
+   * (In other words, currency_a : currency_b.)
+   */
+  high: string
+  /**
+   * The lowest exchange rate among all offers matched in this ledger,
+   * as a ratio of the first currency to the second currency.
+   */
+  low: string
+  /**
+   * The exchange rate at the top of this order book before processing
+   * the transactions in this ledger, as a ratio of the first currency
+   * to the second currency.
+   */
+  open: string
+  /**
+   * The exchange rate at the top of this order book after processing
+   * the transactions in this ledger, as a ratio of the first currency
+   * to the second currency.
+   */
+  close: string
+}
+
 /**
  * The `ledger` stream only sends `ledgerClosed` messages when the consensus
  * process declares a new validated ledger. The message identifies the ledger