diff --git a/package.json b/package.json
index 790d4d83..6c8b37dc 100644
--- a/package.json
+++ b/package.json
@@ -64,10 +64,10 @@
   },
   "devDependencies": {
     "browserify": "^16.5.0",
-    "chai": "^3.5.0",
+    "chai": "^4.2.0",
     "cookie-parser": "^1.3.4",
     "coveralls": "^3.0.2",
-    "dirty-chai": "^1.2.2",
+    "dirty-chai": "^2.0.1",
     "eslint": "^5.3.0",
     "eslint-config-loopback": "^12.0.0",
     "eslint-plugin-mocha": "^5.1.0",
diff --git a/test/loopback.test.js b/test/loopback.test.js
index 79733345..bc3822ba 100644
--- a/test/loopback.test.js
+++ b/test/loopback.test.js
@@ -561,7 +561,9 @@ describe('loopback', function() {
       expect(methodNames).to.include('prototype.instanceMethod');
     });
 
-    it('throws an error when "isStatic:true" and method name starts with "prototype."', function() {
+    // Skip this test in browsers because strong-globalize is not removing
+    // `{{` and `}}` control characters from the string.
+    it.onServer('throws when "isStatic:true" and method name starts with "prototype."', function() {
       var TestModel = loopback.createModel(uniqueModelName);
       expect(function() {
         loopback.configureModel(TestModel, {
@@ -573,8 +575,8 @@ describe('loopback', function() {
             },
           },
         });
-      }).to.throw(Error, new Error('Remoting metadata for' + TestModel.modelName +
-      ' "isStatic" does not match new method name-based style.'));
+      }).to.throw(Error, 'Remoting metadata for ' + TestModel.modelName +
+      '.prototype.instanceMethod "isStatic" does not match new method name-based style.');
     });
 
     it('use "isStatic:true" if method name does not start with "prototype."', function() {
diff --git a/test/model.test.js b/test/model.test.js
index bdebedc0..c048bc32 100644
--- a/test/model.test.js
+++ b/test/model.test.js
@@ -161,8 +161,8 @@ describe.onServer('Remote Methods', function() {
         .end(function(err, res) {
           if (err) return done(err);
           expect(res.body.length).to.eql(2);
-          expect(res.body).to.have.deep.property('[0].first', 'John');
-          expect(res.body).to.have.deep.property('[1].first', 'Jane');
+          expect(res.body).to.have.nested.property('[0].first', 'John');
+          expect(res.body).to.have.nested.property('[1].first', 'Jane');
           done();
         });
     });
@@ -201,8 +201,8 @@ describe.onServer('Remote Methods', function() {
           .end(function(err, result) {
             if (err) return done(err);
             expect(result.body.length).to.eql(2);
-            expect(result.body).to.have.deep.property('[0].title', 'One story');
-            expect(result.body).to.have.deep.property('[1].title', 'Two story');
+            expect(result.body).to.have.nested.property('[0].title', 'One story');
+            expect(result.body).to.have.nested.property('[1].title', 'Two story');
             done();
           });
       });
diff --git a/test/relations.integration.js b/test/relations.integration.js
index b8b77f87..78c91087 100644
--- a/test/relations.integration.js
+++ b/test/relations.integration.js
@@ -1686,8 +1686,8 @@ describe('relations - integration', function() {
         .expect(200, function(err, res) {
           if (err) return done(err);
 
-          expect(res.headers['x-before']).to.empty();
-          expect(res.headers['x-after']).to.empty();
+          expect(res.headers['x-before']).to.be.undefined();
+          expect(res.headers['x-after']).to.be.undefined();
 
           done();
         });
diff --git a/test/role.test.js b/test/role.test.js
index ba3e5024..3d3b7783 100644
--- a/test/role.test.js
+++ b/test/role.test.js
@@ -153,7 +153,7 @@ describe('role model', function() {
       Role.create({name: 'userRole'}, function(err, role) {
         expect(err).to.exist();
         expect(err).to.have.property('name', 'ValidationError');
-        expect(err).to.have.deep.property('details.codes.name');
+        expect(err).to.have.nested.property('details.codes.name');
         expect(err.details.codes.name).to.contain('uniqueness');
         expect(err).to.have.property('statusCode', 422);