diff --git a/packages/nodes-base/nodes/Calendly/CalendlyTrigger.node.ts b/packages/nodes-base/nodes/Calendly/CalendlyTrigger.node.ts
index 596e791d24..f34ced903d 100644
--- a/packages/nodes-base/nodes/Calendly/CalendlyTrigger.node.ts
+++ b/packages/nodes-base/nodes/Calendly/CalendlyTrigger.node.ts
@@ -69,6 +69,18 @@ export class CalendlyTrigger implements INodeType {
 				],
 				default: 'apiKey',
 			},
+			{
+				displayName:
+					'Action required: Calendly will discontinue API Key authentication on May 31, 2025. Update node to use OAuth2 authentication now to ensure your workflows continue to work.',
+				name: 'deprecationNotice',
+				type: 'notice',
+				default: '',
+				displayOptions: {
+					show: {
+						authentication: ['apiKey'],
+					},
+				},
+			},
 			{
 				displayName: 'Scope',
 				name: 'scope',