diff --git a/.github/workflows/infracost.yml b/.github/workflows/infracost.yml
index 8f0ee8ea..d1738a41 100644
--- a/.github/workflows/infracost.yml
+++ b/.github/workflows/infracost.yml
@@ -87,8 +87,13 @@ jobs:
       - name: 📨 Generate Slack message
         id: infracost-slack
         run: |
-          echo "::set-output name=slack-message::$(infracost output --path=/tmp/infracost.json --format=slack-message --show-skipped)"
-          echo "::set-output name=diffTotalMonthlyCost::$(jq '(.diffTotalMonthlyCost // 0) | tonumber' /tmp/infracost.json)"
+          delimiter="EOF_$(openssl rand -hex 16)"
+          {
+            echo "slack-message<<${delimiter}"
+            infracost output --path=/tmp/infracost.json --format=slack-message --show-skipped
+            echo "${delimiter}"
+          } >> "$GITHUB_OUTPUT"
+          echo "diffTotalMonthlyCost=$(jq '(.diffTotalMonthlyCost // 0) | tonumber' /tmp/infracost.json)" >> "$GITHUB_OUTPUT"
 
       - name: 🚀 Send cost estimate to Slack
         uses: slackapi/slack-github-action@v3