diff --git a/package-lock.json b/package-lock.json
index d7a8a56..a4ec1d1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@apidevtools/swagger-express-middleware",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 4bac42b..0aeb614 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@apidevtools/swagger-express-middleware",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "description": "Swagger middleware and mocks for Express",
   "keywords": [
     "express",
diff --git a/test/specs/json-schema/sample.spec.js b/test/specs/json-schema/sample.spec.js
index 4b68a8b..6f8d10b 100644
--- a/test/specs/json-schema/sample.spec.js
+++ b/test/specs/json-schema/sample.spec.js
@@ -548,8 +548,7 @@ describe("JSON Schema sample data", () => {
       });
       for (let i = 0; i < iterations; i++) {
         let obj = schema.sample();
-        expect(obj).to.be.an("object");
-        expect(obj).to.have.lengthOf(0);
+        expect(obj).to.be.an("object").and.empty;  // eslint-disable-line no-unused-expressions
       }
     });
   });