diff --git a/.github/workflows/ci-trigger-full-suite.yml b/.github/workflows/ci-trigger-full-suite.yml
index 7d184249b..494f24b61 100644
--- a/.github/workflows/ci-trigger-full-suite.yml
+++ b/.github/workflows/ci-trigger-full-suite.yml
@@ -2,7 +2,7 @@ name: Trigger Full Suite
 
 on:
   pull_request:
-    types: [labeled]
+    types: [labeled, synchronize]
 
 permissions:
   contents: read
@@ -14,10 +14,43 @@ concurrency:
 
 jobs:
   trigger:
-    if: github.event.label.name == 'ready'
+    if: >-
+      (github.event.action == 'labeled' && github.event.label.name == 'ready')
+      || github.event.action == 'synchronize'
     runs-on: ubuntu-latest
     steps:
+      - name: Check ready label
+        id: check
+        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
+        with:
+          script: |
+            const { data: pr } = await github.rest.pulls.get({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              pull_number: context.payload.pull_request.number,
+            });
+            const hasReady = pr.labels.some(l => l.name === 'ready');
+            core.setOutput('has_ready', String(hasReady));
+            if (!hasReady) core.info('No ready label — skipping Full Suite trigger.');
+
+      - name: Cancel previous Buildkite builds
+        if: steps.check.outputs.has_ready == 'true'
+        env:
+          BUILDKITE_API_TOKEN: ${{ secrets.BUILDKITE_API_TOKEN }}
+          PR_BRANCH: ${{ github.event.pull_request.head.ref }}
+        run: |
+          # Find running builds for this branch with FULL_SUITE=true and cancel them
+          builds=$(curl -sS -H "Authorization: Bearer $BUILDKITE_API_TOKEN" \
+            "https://api.buildkite.com/v2/organizations/${{ vars.BUILDKITE_ORG_SLUG }}/pipelines/${{ vars.BUILDKITE_PIPELINE_SLUG }}/builds?branch=${PR_BRANCH}&state=running,scheduled" \
+            | jq -r '.[] | select(.env.FULL_SUITE == "true") | .number')
+          for build_num in $builds; do
+            echo "Cancelling Buildkite build #$build_num"
+            curl -sS -X PUT -H "Authorization: Bearer $BUILDKITE_API_TOKEN" \
+              "https://api.buildkite.com/v2/organizations/${{ vars.BUILDKITE_ORG_SLUG }}/pipelines/${{ vars.BUILDKITE_PIPELINE_SLUG }}/builds/${build_num}/cancel"
+          done
+
       - name: Trigger Buildkite Full Suite
+        if: steps.check.outputs.has_ready == 'true'
         uses: buildkite/trigger-pipeline-action@v2.4.1
         with:
           buildkite_api_access_token: ${{ secrets.BUILDKITE_API_TOKEN }}