diff --git a/.github/workflows/add-pr-sizing-label.yaml b/.github/workflows/add-pr-sizing-label.yaml
index b8d4983638..b972616fa6 100644
--- a/.github/workflows/add-pr-sizing-label.yaml
+++ b/.github/workflows/add-pr-sizing-label.yaml
@@ -22,6 +22,8 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
+        with:
+          ref: ${{ github.event.pull_request.merge_commit_sha }}
 
       - name: Install PR sizing label script
         run: |
diff --git a/.github/workflows/ci-on-push.yaml b/.github/workflows/ci-on-push.yaml
index e1f3eaf968..f37f1b91ca 100644
--- a/.github/workflows/ci-on-push.yaml
+++ b/.github/workflows/ci-on-push.yaml
@@ -25,7 +25,7 @@ jobs:
     if: ${{ contains(github.event.pull_request.labels.*.name, 'ok-to-test') }}
     uses: ./.github/workflows/ci.yaml
     with:
-      commit-hash: ${{ github.event.pull_request.head.sha }}
+      commit-hash: ${{ github.event.pull_request.merge_commit_sha }}
       pr-number: ${{ github.event.pull_request.number }}
       tag: ${{ github.event.pull_request.number }}-${{ github.event.pull_request.head.sha }}
     secrets: inherit
diff --git a/.github/workflows/move-issues-to-in-progress.yaml b/.github/workflows/move-issues-to-in-progress.yaml
index 64a453d642..2c4c3d2c88 100644
--- a/.github/workflows/move-issues-to-in-progress.yaml
+++ b/.github/workflows/move-issues-to-in-progress.yaml
@@ -39,6 +39,8 @@ jobs:
       - name: Checkout code to allow hub to communicate with the project
         if: ${{ !contains(github.event.pull_request.labels.*.name, 'force-skip-ci') }}
         uses: actions/checkout@v3
+        with:
+          ref: ${{ github.event.pull_request.merge_commit_sha }}
 
       - name: Move issue to "In progress"
         if: ${{ !contains(github.event.pull_request.labels.*.name, 'force-skip-ci') }}
diff --git a/.github/workflows/require-pr-porting-labels.yaml b/.github/workflows/require-pr-porting-labels.yaml
index ea3016b5aa..a06bbbf96e 100644
--- a/.github/workflows/require-pr-porting-labels.yaml
+++ b/.github/workflows/require-pr-porting-labels.yaml
@@ -37,6 +37,8 @@ jobs:
       - name: Checkout code to allow hub to communicate with the project
         if: ${{ !contains(github.event.pull_request.labels.*.name, 'force-skip-ci') }}
         uses: actions/checkout@v3
+        with:
+          ref: ${{ github.event.pull_request.merge_commit_sha }}
 
       - name: Install porting checker script
         run: |