diff --git a/lab/us-gov-east-1/vpc/_mcmCluster/eks-istio/terragrunt.hcl b/lab/us-gov-east-1/vpc/_mcmCluster/eks-istio/terragrunt.hcl
index 7541125..f9c26c0 100644
--- a/lab/us-gov-east-1/vpc/_mcmCluster/eks-istio/terragrunt.hcl
+++ b/lab/us-gov-east-1/vpc/_mcmCluster/eks-istio/terragrunt.hcl
@@ -4,7 +4,7 @@ include "root" {
 }
 
 terraform {
-  source = "git@github.e.it.census.gov:SCT-Engineering/tfmod-istio.git?ref=1.0.4"
+  source = "git@github.e.it.census.gov:SCT-Engineering/tfmod-istio.git?ref=mcmCluster"
   extra_arguments "retry_lock" {
     commands  = get_terraform_commands_that_need_locking()
     arguments = ["-lock-timeout=20m"]