diff --git a/package.json b/package.json
index 340d3e6..2681cbe 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
   "devDependencies": {
     "@eslint/eslintrc": "^3.3.5",
     "async": "^3.2.4",
-    "chai": "^4.2.0",
+    "chai": "^6.2.2",
     "coveralls": "^3.0.7",
     "eslint": "^10.5.0",
     "eslint-config-google": "^0.14.0",
@@ -26,7 +26,7 @@
     "sharedb": "^6.0.0",
     "sharedb-mingo-memory": "^5.0.0",
     "sinon": "^22.0.0",
-    "sinon-chai": "^3.7.0"
+    "sinon-chai": "^4.0.1"
   },
   "scripts": {
     "lint": "./node_modules/.bin/eslint .",
diff --git a/test/test_mongo_middleware.js b/test/test_mongo_middleware.js
index 6c34f17..c75d93e 100644
--- a/test/test_mongo_middleware.js
+++ b/test/test_mongo_middleware.js
@@ -1,7 +1,7 @@
 var async = require('async');
 var sinon = require('sinon');
 var chai = require('chai');
-chai.use(require('sinon-chai'));
+chai.use(require('sinon-chai').default);
 var expect = chai.expect;
 var ShareDbMongo = require('..');
 var mongodb = require('./../mongodb');