diff --git a/src/soroban_rpc.ts b/src/soroban_rpc.ts
index afbd1cf8..7d1a23c5 100644
--- a/src/soroban_rpc.ts
+++ b/src/soroban_rpc.ts
@@ -15,6 +15,11 @@ export namespace SorobanRpc {
     smart: string;
   }
 
+  export interface Cost {
+    cpuInsns: string;
+    memBytes: string;
+  }
+
   export interface GetHealthResponse {
     status: "healthy";
   }
@@ -124,5 +129,6 @@ export namespace SorobanRpc {
     suggestedInclusionFee: string;
     results: SimulateHostFunctionResult[];
     latestLedger: number;
+    cost: Cost;
   }
 }
diff --git a/test/unit/server/simulate_transaction_test.js b/test/unit/server/simulate_transaction_test.js
index 2a40190a..f4d4198f 100644
--- a/test/unit/server/simulate_transaction_test.js
+++ b/test/unit/server/simulate_transaction_test.js
@@ -43,6 +43,10 @@ describe("Server#simulateTransaction", function() {
       },
     ],
     latestLedger: 3,
+    cost: {
+      cpuInsns: "0",
+      memBytes: "0",
+    },
   };
 
   beforeEach(function() {
diff --git a/test/unit/transaction_test.js b/test/unit/transaction_test.js
index dfe7cd16..cfba64b0 100644
--- a/test/unit/transaction_test.js
+++ b/test/unit/transaction_test.js
@@ -43,6 +43,10 @@ describe("assembleTransaction", () => {
       },
     ],
     latestLedger: 3,
+    cost: {
+      cpuInsns: "0",
+      memBytes: "0",
+    },
   };
   describe("Transaction", () => {
     const networkPassphrase = SorobanClient.Networks.TESTNET;