diff --git a/package.json b/package.json
index 5b8d147caf..f820bac420 100644
--- a/package.json
+++ b/package.json
@@ -83,7 +83,7 @@
     "@tryghost/logging": "2.1.2",
     "@tryghost/magic-link": "1.0.21",
     "@tryghost/member-events": "0.4.1",
-    "@tryghost/members-api": "5.4.1",
+    "@tryghost/members-api": "5.5.0",
     "@tryghost/members-events-service": "0.3.2",
     "@tryghost/members-importer": "0.5.6",
     "@tryghost/members-offers": "0.10.9",
diff --git a/test/unit/api/canary/utils/serializers/output/members.test.js b/test/unit/api/canary/utils/serializers/output/members.test.js
new file mode 100644
index 0000000000..e5435240ca
--- /dev/null
+++ b/test/unit/api/canary/utils/serializers/output/members.test.js
@@ -0,0 +1,80 @@
+const should = require('should');
+const sinon = require('sinon');
+const testUtils = require('../../../../../../utils');
+const labs = require('../../../../../../../core/shared/labs');
+const memberSerializer = require('../../../../../../../core/server/api/canary/utils/serializers/output/members');
+
+describe('Unit: canary/utils/serializers/output/members', function () {
+    let memberModel;
+    let labsStub;
+    beforeEach(function () {
+        memberModel = (data) => {
+            return Object.assign(data, {toJSON: sinon.stub().returns(data)});
+        };
+        labsStub = sinon.stub(labs, 'isSet').returns(true);
+    });
+
+    afterEach(function () {
+        sinon.restore();
+    });
+
+    it('browse: includes newsletter data when flag is enabled', function () {
+        const apiConfig = {docName: 'members'};
+        const frame = {
+            options: {
+                context: {}
+            }
+        };
+
+        const ctrlResponse = memberModel(testUtils.DataGenerator.forKnex.createMemberWithNewsletter());
+        memberSerializer.browse({
+            data: [ctrlResponse],
+            meta: null
+        }, apiConfig, frame);
+        should.exist(frame.response.members[0].newsletters);
+    });
+
+    it('browse: removes newsletter data when flag is disabled', function () {
+        labsStub.returns(false);
+        const apiConfig = {docName: 'members'};
+        const frame = {
+            options: {
+                context: {}
+            }
+        };
+
+        const ctrlResponse = memberModel(testUtils.DataGenerator.forKnex.createMemberWithNewsletter());
+        memberSerializer.browse({
+            data: [ctrlResponse],
+            meta: null
+        }, apiConfig, frame);
+        should.not.exist(frame.response.members[0].newsletters);
+    });
+
+    it('read: includes newsletter data when flag is enabled', function () {
+        const apiConfig = {docName: 'members'};
+        const frame = {
+            options: {
+                context: {}
+            }
+        };
+
+        const ctrlResponse = memberModel(testUtils.DataGenerator.forKnex.createMemberWithNewsletter());
+        memberSerializer.read(ctrlResponse, apiConfig, frame);
+        should.exist(frame.response.members[0].newsletters);
+    });
+
+    it('read: removes newsletter data when flag is disabled', function () {
+        labsStub.returns(false);
+        const apiConfig = {docName: 'members'};
+        const frame = {
+            options: {
+                context: {}
+            }
+        };
+
+        const ctrlResponse = memberModel(testUtils.DataGenerator.forKnex.createMemberWithNewsletter());
+        memberSerializer.read(ctrlResponse, apiConfig, frame);
+        should.not.exist(frame.response.members[0].newsletters);
+    });
+});
diff --git a/test/utils/fixtures/data-generator.js b/test/utils/fixtures/data-generator.js
index 8513819183..1a7b4d2084 100644
--- a/test/utils/fixtures/data-generator.js
+++ b/test/utils/fixtures/data-generator.js
@@ -897,6 +897,18 @@ DataGenerator.forKnex = (function () {
         });
     }
 
+    function createMemberWithNewsletter(overrides) {
+        const newObj = _.cloneDeep(overrides);
+
+        return _.defaults(newObj, {
+            id: ObjectId().toHexString(),
+            email: 'member@ghost.org',
+            newsletters: [{
+                id: 'newsletter-1'
+            }]
+        });
+    }
+
     function createLabel(overrides) {
         const newObj = _.cloneDeep(overrides);
 
@@ -1346,6 +1358,7 @@ DataGenerator.forKnex = (function () {
         createSetting,
         createToken,
         createMember,
+        createMemberWithNewsletter,
         createLabel,
         createMembersLabels,
         createMembersStripeCustomer: createBasic,
diff --git a/yarn.lock b/yarn.lock
index 2978e58cf8..1324dbb8f1 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2022,10 +2022,10 @@
     "@tryghost/domain-events" "^0.1.9"
     "@tryghost/member-events" "^0.4.1"
 
-"@tryghost/members-api@5.4.1":
-  version "5.4.1"
-  resolved "https://registry.yarnpkg.com/@tryghost/members-api/-/members-api-5.4.1.tgz#bc9f9c4c61dee186a662050aa00969325e1d3ae5"
-  integrity sha512-8aUQWRc7cOrpeZELdw9T1/0vvA2BSx41yMZlKG1CsOW60zt4YnwiINSlvo0QOtC7ffu59erR40H4IdhKXsMD5w==
+"@tryghost/members-api@5.5.0":
+  version "5.5.0"
+  resolved "https://registry.yarnpkg.com/@tryghost/members-api/-/members-api-5.5.0.tgz#30bf580051f8ca69aa3c31515e83a4348af97f91"
+  integrity sha512-Mwlt3F/bFcGqnnJ9Y4fBkTiQS7tb1++puuO1fh35BNpOL5TuEdYF9kxjkODqnseEioaeWNxigsdx2yvvzgcwPA==
   dependencies:
     "@nexes/nql" "^0.6.0"
     "@tryghost/debug" "^0.1.2"
@@ -2037,7 +2037,7 @@
     "@tryghost/member-events" "^0.4.1"
     "@tryghost/members-analytics-ingress" "^0.1.12"
     "@tryghost/members-payments" "^0.1.11"
-    "@tryghost/members-stripe-service" "^0.9.2"
+    "@tryghost/members-stripe-service" "^0.9.3"
     "@tryghost/tpl" "^0.1.2"
     "@types/jsonwebtoken" "^8.5.1"
     bluebird "^3.5.4"
@@ -2137,6 +2137,20 @@
     lodash "^4.17.21"
     stripe "^8.174.0"
 
+"@tryghost/members-stripe-service@^0.9.3":
+  version "0.9.3"
+  resolved "https://registry.yarnpkg.com/@tryghost/members-stripe-service/-/members-stripe-service-0.9.3.tgz#e5f6995f77c8bbee8ba839bc6f02298c680b8057"
+  integrity sha512-r8n2qrUtkGLE7xAUkVYhCwpo4cfxtiPDa/MiBg9ycvRg81Azz33i9mQpZjiKJlAVn9IzsKaEfQBKioIFun0YyQ==
+  dependencies:
+    "@tryghost/debug" "^0.1.4"
+    "@tryghost/domain-events" "^0.1.9"
+    "@tryghost/errors" "^1.2.5"
+    "@tryghost/logging" "^2.0.5"
+    "@tryghost/member-events" "^0.4.1"
+    leaky-bucket "^2.2.0"
+    lodash "^4.17.21"
+    stripe "^8.174.0"
+
 "@tryghost/metrics@1.0.8":
   version "1.0.8"
   resolved "https://registry.yarnpkg.com/@tryghost/metrics/-/metrics-1.0.8.tgz#01f3b9459c5fc108f5013cbbb72860dc472cb5f4"