diff --git a/.github/workflows/testing-slack.yml b/.github/workflows/testing-slack.yml
index f336492a..eb146c25 100644
--- a/.github/workflows/testing-slack.yml
+++ b/.github/workflows/testing-slack.yml
@@ -25,20 +25,21 @@ jobs:
           # See also: https://api.slack.com/methods/chat.postMessage#channels
           channel-id: 'C07MUHXPX97'
           # For posting a rich message using Block Kit
-          payload: |
-            {
-              "username": "Testing Action",
-              "text": "GitHub Action build result: ${{ job.status }}\n${{ github.event.pull_request.html_url || github.event.head_commit.url }}",
-              "blocks": [
-                {
-                  "type": "section",
-                  "text": {
-                    "type": "mrkdwn",
-                    "text": "old *bolded* text"
-                  }
-                }
-              ]
-            }
+          # payload: |
+          #   {
+          #     "username": "Testing Action",
+          #     "text": "GitHub Action build result: ${{ job.status }}\n${{ github.event.pull_request.html_url || github.event.head_commit.url }}",
+          #     "blocks": [
+          #       {
+          #         "type": "section",
+          #         "text": {
+          #           "type": "mrkdwn",
+          #           "text": "old *bolded* text"
+          #         }
+          #       }
+          #     ]
+          #   }
+          payload-file-path: "./payload.json"
         env:
           SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }}
 
diff --git a/payload.json b/payload.json
new file mode 100644
index 00000000..5643f8b4
--- /dev/null
+++ b/payload.json
@@ -0,0 +1,13 @@
+{
+  "username": "Testing Action",
+  "text": "GitHub Action build result: ${{ job.status }}\n${{ github.event.pull_request.html_url || github.event.head_commit.url }}",
+  "blocks": [
+    {
+      "type": "section",
+      "text": {
+        "type": "mrkdwn",
+        "text": "old *bolded* text"
+      }
+    }
+  ]
+}