diff --git a/integrations/optimizely/lib/index.js b/integrations/optimizely/lib/index.js
index 8c18d286d..ab455ab3d 100644
--- a/integrations/optimizely/lib/index.js
+++ b/integrations/optimizely/lib/index.js
@@ -113,7 +113,7 @@ Optimizely.prototype.track = function(track) {
   var payload = {
     type: 'event',
     eventName: eventName,
-    tags: eventProperties
+    properties: eventProperties
   };
 
   push(payload);
@@ -132,7 +132,7 @@ Optimizely.prototype.track = function(track) {
         eventName,
         userId,
         attributes,
-        payload.tags
+        payload.properties
       );
     }
   }
diff --git a/integrations/optimizely/package.json b/integrations/optimizely/package.json
index 00c1150e5..e787070a2 100644
--- a/integrations/optimizely/package.json
+++ b/integrations/optimizely/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@segment/analytics.js-integration-optimizely",
   "description": "The Optimizely analytics.js integration.",
-  "version": "3.5.1",
+  "version": "3.5.2",
   "keywords": [
     "analytics.js",
     "analytics.js-integration",
diff --git a/integrations/optimizely/test/index.test.js b/integrations/optimizely/test/index.test.js
index 81253a299..49c547dce 100644
--- a/integrations/optimizely/test/index.test.js
+++ b/integrations/optimizely/test/index.test.js
@@ -546,7 +546,7 @@ describe('Optimizely', function() {
         analytics.called(window.optimizely.push, {
           type: 'event',
           eventName: 'Order Updated',
-          tags: {}
+          properties: {}
         });
       });
 
@@ -558,7 +558,7 @@ describe('Optimizely', function() {
         analytics.called(window.optimizely.push, {
           type: 'event',
           eventName: 'Order Completed',
-          tags: {
+          properties: {
             revenue: 999
           }
         });
@@ -573,7 +573,7 @@ describe('Optimizely', function() {
         analytics.called(window.optimizely.push, {
           type: 'event',
           eventName: 'Checkout Started',
-          tags: {
+          properties: {
             revenue: 999
           }
         });
@@ -830,7 +830,7 @@ describe('Optimizely', function() {
         analytics.called(window.optimizely.push, {
           type: 'event',
           eventName: 'Order Updated',
-          tags: {}
+          properties: {}
         });
       });
 
@@ -843,7 +843,7 @@ describe('Optimizely', function() {
         analytics.called(window.optimizely.push, {
           type: 'event',
           eventName: 'Order Completed',
-          tags: {
+          properties: {
             revenue: 999
           }
         });
@@ -858,7 +858,7 @@ describe('Optimizely', function() {
         analytics.called(window.optimizely.push, {
           type: 'event',
           eventName: 'Checkout Started',
-          tags: {
+          properties: {
             revenue: 999
           }
         });
@@ -1075,7 +1075,7 @@ describe('Optimizely', function() {
         analytics.called(window.optimizely.push, {
           type: 'event',
           eventName: 'event',
-          tags: {}
+          properties: {}
         });
       });
 
@@ -1084,25 +1084,25 @@ describe('Optimizely', function() {
         analytics.called(window.optimizely.push, {
           type: 'event',
           eventName: 'event_foo_bar',
-          tags: {}
+          properties: {}
         });
       });
 
-      it('should send all additional properties along as tags', function() {
+      it('should send all additional properties along as properties', function() {
         analytics.track('event', { id: 'c00lHa$h', name: 'jerry' });
         analytics.called(window.optimizely.push, {
           type: 'event',
           eventName: 'event',
-          tags: { id: 'c00lHa$h', name: 'jerry' }
+          properties: { id: 'c00lHa$h', name: 'jerry' }
         });
       });
 
-      it('should change revenue to cents and include in tags', function() {
+      it('should change revenue to cents and include in properties', function() {
         analytics.track('Order Completed', { revenue: 9.99 });
         analytics.called(window.optimizely.push, {
           type: 'event',
           eventName: 'Order Completed',
-          tags: { revenue: 999 }
+          properties: { revenue: 999 }
         });
       });
 
@@ -1111,7 +1111,7 @@ describe('Optimizely', function() {
         analytics.called(window.optimizely.push, {
           type: 'event',
           eventName: 'Order Completed',
-          tags: { revenue: 53431 }
+          properties: { revenue: 53431 }
         });
       });
 
@@ -1223,7 +1223,7 @@ describe('Optimizely', function() {
         analytics.called(window.optimizely.push, {
           type: 'event',
           eventName: 'Viewed Home Page',
-          tags: {
+          properties: {
             name: 'Home',
             path: '/context.html',
             referrer: referrer,
@@ -1240,7 +1240,7 @@ describe('Optimizely', function() {
         analytics.called(window.optimizely.push, {
           type: 'event',
           eventName: 'Viewed Blog New Integration Page',
-          tags: {
+          properties: {
             name: 'New Integration',
             category: 'Blog',
             path: '/context.html',