Update README.md

Author: julianwood

README.md

@@ -89,7 +89,7 @@ Lumigo helps identify functions that are CPU- or network-bound. This allows you
 [View extension](https://github.com/lumigo-io/lambda-log-shipper) | [View extension](https://github.com/newrelic/newrelic-lambda-extension) | [View extension](https://github.com/SumoLogic/sumologic-lambda-extensions)
 
 ## Available AWS Lambda Ready Partner extensions
-* [AppDynamics](https://docs.appdynamics.com/display/PRO20X/Use+the+AppDynamics+AWS+Lambda+Extension+to+Instrument+Serverless+APM+at+Runtime): The AppDynamics AWS Lambda Extension provides automatic instrumentation of Node.js or Python Lambda functions to provide visibility and alerting on function performance in a broader business context
+* [AppDynamics](https://docs.appdynamics.com/21.5/en/application-monitoring/install-app-server-agents/serverless-apm-for-aws-lambda/use-the-appdynamics-aws-lambda-extension-to-instrument-serverless-apm-at-runtime): The AppDynamics AWS Lambda Extension provides automatic instrumentation of Node.js or Python Lambda functions to provide visibility and alerting on function performance in a broader business context
 * [Check Point CloudGuard](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk172491&partition=Advanced&product=CloudGuard): Check Point CloudGuard Serverless Protection is a Lambda Layer/Extension-based runtime protection solution providing zero-configuration security for Lambda Functions.
 * [Datadog](https://docs.datadoghq.com/serverless/datadog_lambda_library/extension/): The Datadog extension brings comprehensive, real-time visibility to your serverless applications. Combined with Datadog’s existing AWS integration, you get metrics, traces, and logs to help you monitor, detect, and resolve issues at any scale.
 * [Dynatrace](https://www.dynatrace.com/support/help/technology-support/cloud-platforms/amazon-web-services/integrations/deploy-oneagent-as-lambda-extension/): The Dynatrace AWS Lambda extension delivers end-to-end visibility into traces and metrics and leverages AI for automated error detection and root cause analysis across the entire application stack.