diff --git a/functions/src/scripts/update-last-comment-time.ts b/functions/src/scripts/update-last-comment-time.ts
new file mode 100644
index 00000000..ae950fbe
--- /dev/null
+++ b/functions/src/scripts/update-last-comment-time.ts
@@ -0,0 +1,43 @@
+import * as admin from 'firebase-admin'
+import * as _ from 'lodash'
+
+import { initAdmin } from './script-init'
+initAdmin()
+
+import { Contract } from '../../../common/contract'
+import { getValues } from '../utils'
+import { Comment } from '../../../common/comment'
+
+async function updateLastCommentTime() {
+  const firestore = admin.firestore()
+  console.log('Updating contracts lastCommentTime')
+
+  const contracts = await getValues<Contract>(firestore.collection('contracts'))
+
+  console.log('Loaded', contracts.length, 'contracts')
+
+  for (const contract of contracts) {
+    const contractRef = firestore.doc(`contracts/${contract.id}`)
+
+    const lastComments = await getValues<Comment>(
+      contractRef.collection('comments').orderBy('createdTime', 'desc').limit(1)
+    )
+
+    if (lastComments.length > 0) {
+      const lastCommentTime = lastComments[0].createdTime
+      console.log(
+        'Updating lastCommentTime',
+        contract.question,
+        lastCommentTime
+      )
+
+      await contractRef.update({
+        lastCommentTime,
+      } as Partial<Contract>)
+    }
+  }
+}
+
+if (require.main === module) {
+  updateLastCommentTime().then(() => process.exit())
+}