diff --git a/lib/api.js b/lib/api.js
index 802034e..d607614 100644
--- a/lib/api.js
+++ b/lib/api.js
@@ -104,6 +104,13 @@ export async function updateMemberSubscription(req, res) {
     startDate: startDate.toISOString().slice(0, 10)
   })
 
+  // TODO: remove this legacy update once "abos" has been removed from the users collection
+  await Subscription.updateAboStartDateInUserLegacy(
+    memberId,
+    subscription.started,
+    updatedSubscription.startDate
+  )
+
   Audit.logAuditTrail(req.user, 'MEMBER_SUBSCRIPTION_UPDATE', {
     memberId,
     subscriptionId,
diff --git a/lib/models/activity.js b/lib/models/activity.js
index 2f2bc18..268d059 100644
--- a/lib/models/activity.js
+++ b/lib/models/activity.js
@@ -12,6 +12,7 @@ export async function getMemberActivity(memberId) {
     throw createHttpError(404, 'Member not found')
   }
 
+  // TODO: we should retrieve subscriptions from the "subscriptions" collection instead of the user profile
   const {abos} = user.profile
 
   const activity = await mongo.db.collection('member_activity')
diff --git a/lib/models/subscription.js b/lib/models/subscription.js
index 5809efe..8712a16 100644
--- a/lib/models/subscription.js
+++ b/lib/models/subscription.js
@@ -72,9 +72,34 @@ export async function updateSubscription(_id, set) {
     },
     {returnDocument: 'after'}
   )
+
   return updatedSubscription.value
 }
 
+// TODO: deprecated, to remove once "abos" has been removed from the users collection
+export async function updateAboStartDateInUserLegacy(memberId, previousStartDate, newStartDate) {
+  const user = await mongo.db.collection('users').findOne({_id: memberId})
+  const updatedAbos = user.profile.abos.map(abo => {
+    if (abo.aboStart === previousStartDate) {
+      return {
+        ...abo,
+        aboStart: newStartDate
+      }
+    }
+
+    return abo
+  })
+
+  await mongo.db.collection('users').updateOne(
+    {_id: memberId},
+    {
+      $set: {
+        'profile.abos': updatedAbos
+      }
+    }
+  )
+}
+
 /**
  * Calculate the unit price of a subscription based on its date.
  *