diff --git a/contracts/test/benchmarks/execution-time.test.js b/contracts/test/benchmarks/execution-time.test.js
index 898e8798..3c533c1c 100644
--- a/contracts/test/benchmarks/execution-time.test.js
+++ b/contracts/test/benchmarks/execution-time.test.js
@@ -1,4 +1,4 @@
-const { expect } = require("chai");
+import { expect } from "chai";
 
 describe("Execution Time Benchmarks", function () {
   describe("EscrowService", function () {
diff --git a/contracts/test/benchmarks/gas-usage.test.js b/contracts/test/benchmarks/gas-usage.test.js
index 17cafd43..e106d8ab 100644
--- a/contracts/test/benchmarks/gas-usage.test.js
+++ b/contracts/test/benchmarks/gas-usage.test.js
@@ -1,4 +1,4 @@
-const { expect } = require("chai");
+import { expect } from "chai";
 
 describe("Gas Usage Benchmarks", function () {
   describe("EscrowService", function () {
diff --git a/contracts/test/benchmarks/throughput.test.js b/contracts/test/benchmarks/throughput.test.js
index cef7e347..df32daa4 100644
--- a/contracts/test/benchmarks/throughput.test.js
+++ b/contracts/test/benchmarks/throughput.test.js
@@ -1,4 +1,4 @@
-const { expect } = require("chai");
+import { expect } from "chai";
 
 describe("Throughput Benchmarks", function () {
   describe("EscrowService", function () {