diff --git a/action.yml b/action.yml
index 420fa84..96558e7 100644
--- a/action.yml
+++ b/action.yml
@@ -5,7 +5,6 @@ inputs:
   webhook-url:
     description: Specify Slack Incoming Webhook URL
     required: false
-    default: SLACK_WEBHOOK_URL environment variable
   config:
     description: Configuration file
     required: false
@@ -23,7 +22,7 @@ inputs:
     description: Override message format for step
     required: false
 runs:
-  using: 'node12'
+  using: 'node16'
   main: 'dist/index.js'
 branding:
   icon: alert-circle