diff --git a/CHANGES.md b/CHANGES.md
index cc91dace..439a6d48 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -4,6 +4,9 @@ Notable changes between versions.
 
 ## Latest
 
+* Require Terraform version v0.12.6+ (action required)
+  * Replace internal usage of `template_dir` with `templatefile` function
+
 ## v1.16.3
 
 * Kubernetes [v1.16.3](https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.16.md#v1163)
diff --git a/aws/container-linux/kubernetes/bootstrap.tf b/aws/container-linux/kubernetes/bootstrap.tf
index 7da8b732..cea53058 100644
--- a/aws/container-linux/kubernetes/bootstrap.tf
+++ b/aws/container-linux/kubernetes/bootstrap.tf
@@ -1,6 +1,6 @@
 # Kubernetes assets (kubeconfig, manifests)
 module "bootstrap" {
-  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=0daa1276c633fea28e41b2c2c18831e2584deb24"
+  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=1bba891d95b143866614c928f87026e4c79f2eae"
 
   cluster_name          = var.cluster_name
   api_servers           = [format("%s.%s", var.cluster_name, var.dns_zone)]
diff --git a/aws/container-linux/kubernetes/versions.tf b/aws/container-linux/kubernetes/versions.tf
index 5f5ac8a2..f7a10ff1 100644
--- a/aws/container-linux/kubernetes/versions.tf
+++ b/aws/container-linux/kubernetes/versions.tf
@@ -1,7 +1,7 @@
 # Terraform version and plugin versions
 
 terraform {
-  required_version = "~> 0.12.0"
+  required_version = "~> 0.12.6"
   required_providers {
     aws      = "~> 2.23"
     ct       = "~> 0.3"
diff --git a/aws/fedora-coreos/kubernetes/bootstrap.tf b/aws/fedora-coreos/kubernetes/bootstrap.tf
index 908ed4f7..b9ee80c4 100644
--- a/aws/fedora-coreos/kubernetes/bootstrap.tf
+++ b/aws/fedora-coreos/kubernetes/bootstrap.tf
@@ -1,6 +1,6 @@
 # Kubernetes assets (kubeconfig, manifests)
 module "bootstrap" {
-  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=0daa1276c633fea28e41b2c2c18831e2584deb24"
+  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=1bba891d95b143866614c928f87026e4c79f2eae"
 
   cluster_name          = var.cluster_name
   api_servers           = [format("%s.%s", var.cluster_name, var.dns_zone)]
diff --git a/aws/fedora-coreos/kubernetes/versions.tf b/aws/fedora-coreos/kubernetes/versions.tf
index 83532feb..bd2776f0 100644
--- a/aws/fedora-coreos/kubernetes/versions.tf
+++ b/aws/fedora-coreos/kubernetes/versions.tf
@@ -1,7 +1,7 @@
 # Terraform version and plugin versions
 
 terraform {
-  required_version = "~> 0.12.0"
+  required_version = "~> 0.12.6"
   required_providers {
     aws      = "~> 2.23"
     ct       = "~> 0.4"
diff --git a/azure/container-linux/kubernetes/bootstrap.tf b/azure/container-linux/kubernetes/bootstrap.tf
index e82cce15..41ca287f 100644
--- a/azure/container-linux/kubernetes/bootstrap.tf
+++ b/azure/container-linux/kubernetes/bootstrap.tf
@@ -1,6 +1,6 @@
 # Kubernetes assets (kubeconfig, manifests)
 module "bootstrap" {
-  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=0daa1276c633fea28e41b2c2c18831e2584deb24"
+  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=1bba891d95b143866614c928f87026e4c79f2eae"
 
   cluster_name = var.cluster_name
   api_servers  = [format("%s.%s", var.cluster_name, var.dns_zone)]
diff --git a/azure/container-linux/kubernetes/versions.tf b/azure/container-linux/kubernetes/versions.tf
index f42de22a..098f8194 100644
--- a/azure/container-linux/kubernetes/versions.tf
+++ b/azure/container-linux/kubernetes/versions.tf
@@ -1,7 +1,7 @@
 # Terraform version and plugin versions
 
 terraform {
-  required_version = "~> 0.12.0"
+  required_version = "~> 0.12.6"
   required_providers {
     azurerm  = "~> 1.27"
     ct       = "~> 0.3"
diff --git a/bare-metal/container-linux/kubernetes/bootstrap.tf b/bare-metal/container-linux/kubernetes/bootstrap.tf
index 0d06dcc7..f46a56fd 100644
--- a/bare-metal/container-linux/kubernetes/bootstrap.tf
+++ b/bare-metal/container-linux/kubernetes/bootstrap.tf
@@ -1,6 +1,6 @@
 # Kubernetes assets (kubeconfig, manifests)
 module "bootstrap" {
-  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=0daa1276c633fea28e41b2c2c18831e2584deb24"
+  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=1bba891d95b143866614c928f87026e4c79f2eae"
 
   cluster_name                    = var.cluster_name
   api_servers                     = [var.k8s_domain_name]
diff --git a/bare-metal/container-linux/kubernetes/versions.tf b/bare-metal/container-linux/kubernetes/versions.tf
index 6caf55c7..f7f7aaf6 100644
--- a/bare-metal/container-linux/kubernetes/versions.tf
+++ b/bare-metal/container-linux/kubernetes/versions.tf
@@ -1,7 +1,7 @@
 # Terraform version and plugin versions
 
 terraform {
-  required_version = "~> 0.12.0"
+  required_version = "~> 0.12.6"
   required_providers {
     matchbox = "~> 0.3.0"
     ct       = "~> 0.3"
diff --git a/bare-metal/fedora-coreos/kubernetes/bootstrap.tf b/bare-metal/fedora-coreos/kubernetes/bootstrap.tf
index 39c8be60..6b81cf94 100644
--- a/bare-metal/fedora-coreos/kubernetes/bootstrap.tf
+++ b/bare-metal/fedora-coreos/kubernetes/bootstrap.tf
@@ -1,6 +1,6 @@
 # Kubernetes assets (kubeconfig, manifests)
 module "bootstrap" {
-  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=0daa1276c633fea28e41b2c2c18831e2584deb24"
+  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=1bba891d95b143866614c928f87026e4c79f2eae"
 
   cluster_name                    = var.cluster_name
   api_servers                     = [var.k8s_domain_name]
diff --git a/bare-metal/fedora-coreos/kubernetes/versions.tf b/bare-metal/fedora-coreos/kubernetes/versions.tf
index a78ffe6b..fd7df2ff 100644
--- a/bare-metal/fedora-coreos/kubernetes/versions.tf
+++ b/bare-metal/fedora-coreos/kubernetes/versions.tf
@@ -1,7 +1,7 @@
 # Terraform version and plugin versions
 
 terraform {
-  required_version = "~> 0.12.0"
+  required_version = "~> 0.12.6"
   required_providers {
     matchbox = "~> 0.3.0"
     ct       = "~> 0.4"
diff --git a/digital-ocean/container-linux/kubernetes/bootstrap.tf b/digital-ocean/container-linux/kubernetes/bootstrap.tf
index 38d69631..dbb539ab 100644
--- a/digital-ocean/container-linux/kubernetes/bootstrap.tf
+++ b/digital-ocean/container-linux/kubernetes/bootstrap.tf
@@ -1,6 +1,6 @@
 # Kubernetes assets (kubeconfig, manifests)
 module "bootstrap" {
-  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=0daa1276c633fea28e41b2c2c18831e2584deb24"
+  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=1bba891d95b143866614c928f87026e4c79f2eae"
 
   cluster_name = var.cluster_name
   api_servers  = [format("%s.%s", var.cluster_name, var.dns_zone)]
diff --git a/digital-ocean/container-linux/kubernetes/versions.tf b/digital-ocean/container-linux/kubernetes/versions.tf
index 1690ab5d..c0e31a27 100644
--- a/digital-ocean/container-linux/kubernetes/versions.tf
+++ b/digital-ocean/container-linux/kubernetes/versions.tf
@@ -1,7 +1,7 @@
 # Terraform version and plugin versions
 
 terraform {
-  required_version = "~> 0.12.0"
+  required_version = "~> 0.12.6"
   required_providers {
     digitalocean = "~> 1.3"
     ct           = "~> 0.3"
diff --git a/google-cloud/container-linux/kubernetes/bootstrap.tf b/google-cloud/container-linux/kubernetes/bootstrap.tf
index f99e9e69..30345676 100644
--- a/google-cloud/container-linux/kubernetes/bootstrap.tf
+++ b/google-cloud/container-linux/kubernetes/bootstrap.tf
@@ -1,6 +1,6 @@
 # Kubernetes assets (kubeconfig, manifests)
 module "bootstrap" {
-  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=0daa1276c633fea28e41b2c2c18831e2584deb24"
+  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=1bba891d95b143866614c928f87026e4c79f2eae"
 
   cluster_name          = var.cluster_name
   api_servers           = [format("%s.%s", var.cluster_name, var.dns_zone)]
diff --git a/google-cloud/container-linux/kubernetes/versions.tf b/google-cloud/container-linux/kubernetes/versions.tf
index 2dc04ad2..1ebc23a3 100644
--- a/google-cloud/container-linux/kubernetes/versions.tf
+++ b/google-cloud/container-linux/kubernetes/versions.tf
@@ -1,7 +1,7 @@
 # Terraform version and plugin versions
 
 terraform {
-  required_version = "~> 0.12.0"
+  required_version = "~> 0.12.6"
   required_providers {
     google       = "~> 2.5"
     ct           = "~> 0.3"