diff --git a/src/README.md b/src/README.md
index 2dedb4d..f72db48 100644
--- a/src/README.md
+++ b/src/README.md
@@ -323,6 +323,6 @@ No resources.
 - [How to deploy AWS Network Firewall by using AWS Firewall Manager](https://aws.amazon.com/blogs/security/how-to-deploy-aws-network-firewall-by-using-aws-firewall-manager)
 - [A Deep Dive into AWS Transit Gateway](https://www.youtube.com/watch?v=a55Iud-66q0)
 - [Appliance in a shared services VPC](https://docs.aws.amazon.com/vpc/latest/tgw/transit-gateway-appliance-scenario.html)
-- [cloudposse/terraform-aws-components](https://github.com/cloudposse/terraform-aws-components/tree/master/modules/TODO) - Cloud Posse's upstream component
+- [cloudposse/terraform-aws-components](https://github.com/cloudposse/terraform-aws-components/tree/main/modules/TODO) - Cloud Posse's upstream component
 
 [<img src="https://cloudposse.com/logo-300x69.svg" height="32" align="right"/>](https://cpco.io/component)