diff --git a/terraform/demo/main.tf b/terraform/demo/main.tf
index cb703cf50..e609c8c34 100644
--- a/terraform/demo/main.tf
+++ b/terraform/demo/main.tf
@@ -7,7 +7,7 @@ locals {
 }
 
 module "database" {
-  source = "github.com/18f/terraform-cloudgov//database"
+  source = "github.com/18f/terraform-cloudgov//database?ref=v0.1.0"
 
   cf_user          = var.cf_user
   cf_password      = var.cf_password
@@ -20,7 +20,7 @@ module "database" {
 }
 
 module "redis" {
-  source = "github.com/18f/terraform-cloudgov//redis"
+  source = "github.com/18f/terraform-cloudgov//redis?ref=v0.1.0"
 
   cf_user          = var.cf_user
   cf_password      = var.cf_password
@@ -33,7 +33,7 @@ module "redis" {
 }
 
 module "csv_upload_bucket" {
-  source = "github.com/18f/terraform-cloudgov//s3"
+  source = "github.com/18f/terraform-cloudgov//s3?ref=v0.1.0"
 
   cf_user          = var.cf_user
   cf_password      = var.cf_password
@@ -44,7 +44,7 @@ module "csv_upload_bucket" {
 }
 
 module "contact_list_bucket" {
-  source = "github.com/18f/terraform-cloudgov//s3"
+  source = "github.com/18f/terraform-cloudgov//s3?ref=v0.1.0"
 
   cf_user          = var.cf_user
   cf_password      = var.cf_password
diff --git a/terraform/production/main.tf b/terraform/production/main.tf
index e32610a37..cd9fb7126 100644
--- a/terraform/production/main.tf
+++ b/terraform/production/main.tf
@@ -7,7 +7,7 @@ locals {
 }
 
 module "database" {
-  source = "github.com/18f/terraform-cloudgov//database"
+  source = "github.com/18f/terraform-cloudgov//database?ref=v0.1.0"
 
   cf_user          = var.cf_user
   cf_password      = var.cf_password
@@ -20,7 +20,7 @@ module "database" {
 }
 
 module "redis" {
-  source = "github.com/18f/terraform-cloudgov//redis"
+  source = "github.com/18f/terraform-cloudgov//redis?ref=v0.1.0"
 
   cf_user          = var.cf_user
   cf_password      = var.cf_password
@@ -33,7 +33,7 @@ module "redis" {
 }
 
 module "csv_upload_bucket" {
-  source = "github.com/18f/terraform-cloudgov//s3"
+  source = "github.com/18f/terraform-cloudgov//s3?ref=v0.1.0"
 
   cf_user          = var.cf_user
   cf_password      = var.cf_password
@@ -44,7 +44,7 @@ module "csv_upload_bucket" {
 }
 
 module "contact_list_bucket" {
-  source = "github.com/18f/terraform-cloudgov//s3"
+  source = "github.com/18f/terraform-cloudgov//s3?ref=v0.1.0"
 
   cf_user          = var.cf_user
   cf_password      = var.cf_password
@@ -74,7 +74,7 @@ module "egress-space" {
 #     `cf create-domain TKTK-org-name TKTK-production-domain-name`
 ###########################################################################
 # module "domain" {
-#   source = "github.com/18f/terraform-cloudgov//domain"
+#   source = "github.com/18f/terraform-cloudgov//domain?ref=v0.1.0"
 #
 #   cf_user          = var.cf_user
 #   cf_password      = var.cf_password
diff --git a/terraform/sandbox/main.tf b/terraform/sandbox/main.tf
index 96e0338ab..1a692080a 100644
--- a/terraform/sandbox/main.tf
+++ b/terraform/sandbox/main.tf
@@ -7,7 +7,7 @@ locals {
 }
 
 module "database" {
-  source = "github.com/18f/terraform-cloudgov//database"
+  source = "github.com/18f/terraform-cloudgov//database?ref=v0.1.0"
 
   cf_user          = var.cf_user
   cf_password      = var.cf_password
@@ -20,7 +20,7 @@ module "database" {
 }
 
 module "redis" {
-  source = "github.com/18f/terraform-cloudgov//redis"
+  source = "github.com/18f/terraform-cloudgov//redis?ref=v0.1.0"
 
   cf_user          = var.cf_user
   cf_password      = var.cf_password
@@ -33,7 +33,7 @@ module "redis" {
 }
 
 module "csv_upload_bucket" {
-  source = "github.com/18f/terraform-cloudgov//s3"
+  source = "github.com/18f/terraform-cloudgov//s3?ref=v0.1.0"
 
   cf_user          = var.cf_user
   cf_password      = var.cf_password
@@ -44,7 +44,7 @@ module "csv_upload_bucket" {
 }
 
 module "contact_list_bucket" {
-  source = "github.com/18f/terraform-cloudgov//s3"
+  source = "github.com/18f/terraform-cloudgov//s3?ref=v0.1.0"
 
   cf_user          = var.cf_user
   cf_password      = var.cf_password
diff --git a/terraform/staging/main.tf b/terraform/staging/main.tf
index 911e9d8b9..5a2143090 100644
--- a/terraform/staging/main.tf
+++ b/terraform/staging/main.tf
@@ -7,7 +7,7 @@ locals {
 }
 
 module "database" {
-  source = "github.com/18f/terraform-cloudgov//database"
+  source = "github.com/18f/terraform-cloudgov//database?ref=v0.1.0"
 
   cf_user          = var.cf_user
   cf_password      = var.cf_password
@@ -20,7 +20,7 @@ module "database" {
 }
 
 module "redis" {
-  source = "github.com/18f/terraform-cloudgov//redis"
+  source = "github.com/18f/terraform-cloudgov//redis?ref=v0.1.0"
 
   cf_user          = var.cf_user
   cf_password      = var.cf_password
@@ -33,7 +33,7 @@ module "redis" {
 }
 
 module "csv_upload_bucket" {
-  source = "github.com/18f/terraform-cloudgov//s3"
+  source = "github.com/18f/terraform-cloudgov//s3?ref=v0.1.0"
 
   cf_user          = var.cf_user
   cf_password      = var.cf_password
@@ -44,7 +44,7 @@ module "csv_upload_bucket" {
 }
 
 module "contact_list_bucket" {
-  source = "github.com/18f/terraform-cloudgov//s3"
+  source = "github.com/18f/terraform-cloudgov//s3?ref=v0.1.0"
 
   cf_user          = var.cf_user
   cf_password      = var.cf_password