diff --git a/.github/workflows/lts-backport.yaml b/.github/workflows/lts-backport.yaml
index 45638098c836..262b95c4366f 100644
--- a/.github/workflows/lts-backport.yaml
+++ b/.github/workflows/lts-backport.yaml
@@ -1,15 +1,14 @@
 name: Add to backporting project
 
 on:
-  pull_request:
-    types:
-      - closed
+  push:
+    branches:
+      - main
 
 jobs:
   add-to-backporting-project:
     if: "github.event.pull_request.merged == true
-         && github.event.pull_request.base.ref == 'main'
-         && !contains(github.event.pull_request.body, '[Next only]')"
+         && !contains(github.event.push.message, '[Next only]')"
     runs-on: ubuntu-latest
 
     steps:
@@ -18,7 +17,7 @@ jobs:
           fetch-depth: 0
       - uses: coursier/cache-action@v6
       - uses: VirtusLab/scala-cli-setup@v1.0.5
-      - run: scala-cli ./project/scripts/addToBackportingProject.scala -- ${{ github.event.pull_request.number }}
+      - run: scala-cli ./project/scripts/addToBackportingProject.scala -- ${{ github.event.push.after }}
         env:
-          GRAPHQL_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GRAPHQL_API_TOKEN: ${{ secrets.GRAPHQL_API_TOKEN }}
 
diff --git a/project/scripts/addToBackportingProject.scala b/project/scripts/addToBackportingProject.scala
index 794975b16b14..37edc8a47efa 100644
--- a/project/scripts/addToBackportingProject.scala
+++ b/project/scripts/addToBackportingProject.scala
@@ -13,18 +13,25 @@ case class ID(value: String) derives WrapperVariable
 val PROJECT_ID = ID("PVT_kwDOACj3ec4AWSoi")
 val FIELD_ID = ID("PVTF_lADOACj3ec4AWSoizgO7uJ4")
 
-@main def run(number: Int) =
-  val (id, date) = getPrData(number)
+@main def run(commitSha: String) =
+  val (id, date) = getPrData(commitSha)
   val newId = addItem(id)
   timestampItem(newId, date)
 
-def getPrData(number: Int): (ID, String) =
+def getPrData(commitSha: String): (ID, String) =
   val res = query"""
-    |query getPR {
-    |  repository(owner: "lampepfl", name:"dotty") {
-    |    pullRequest(number: $number) {
-    |      id
-    |      mergedAt
+    |query prForCommit {
+    |  repository(owner:"lampepfl", name:"dotty") {
+    |    object(expression: $commitSha){
+    |      ... on Commit {
+    |        associatedPullRequests(first: 1) {
+    |          nodes {
+    |            number
+    |            id
+    |            mergedAt
+    |          }
+    |        }
+    |      }
     |    }
     |  }
     |}
@@ -33,7 +40,8 @@ def getPrData(number: Int): (ID, String) =
       "DummyUser",
       apiToken
     )
-  (ID(res.repository.pullRequest.id), res.repository.pullRequest.mergedAt)
+  val pr = res.repository.`object`.associatedPullRequests.nodes.head
+  (ID(pr.id), pr.mergedAt)
 
 def timestampItem(id: ID, date: String) =
   query"""