diff --git a/cl/controller.yaml b/butane/controller.yaml
similarity index 98%
rename from cl/controller.yaml
rename to butane/controller.yaml
index 6abbeca..aa49d00 100644
--- a/cl/controller.yaml
+++ b/butane/controller.yaml
@@ -1,4 +1,5 @@
----
+variant: flatcar
+version: 1.0.0
 systemd:
   units:
     - name: etcd-member.service
@@ -142,15 +143,12 @@ systemd:
 storage:
   directories:
     - path: /var/lib/etcd
-      filesystem: root
       mode: 0700
       overwrite: true
     - path: /etc/kubernetes
-      filesystem: root
       mode: 0755
   files:
     - path: /opt/bootstrap/layout
-      filesystem: root
       mode: 0544
       contents:
         inline: |
@@ -173,7 +171,6 @@ storage:
           mv manifests-networking/* /opt/bootstrap/assets/manifests/
           rm -rf assets auth static-manifests tls manifests-networking
     - path: /opt/bootstrap/apply
-      filesystem: root
       mode: 0544
       contents:
         inline: |
@@ -188,13 +185,11 @@ storage:
              sleep 5
           done
     - path: /etc/sysctl.d/max-user-watches.conf
-      filesystem: root
       mode: 0644
       contents:
         inline: |
           fs.inotify.max_user_watches=16184
     - path: /etc/etcd/etcd.env
-      filesystem: root
       mode: 0644
       contents:
           inline: |
diff --git a/cl/worker.yaml b/butane/worker.yaml
similarity index 98%
rename from cl/worker.yaml
rename to butane/worker.yaml
index bf5db4e..7fc9f4d 100644
--- a/cl/worker.yaml
+++ b/butane/worker.yaml
@@ -1,4 +1,5 @@
----
+variant: flatcar
+version: 1.0.0
 systemd:
   units:
     - name: docker.service
@@ -108,11 +109,9 @@ systemd:
 storage:
   directories:
     - path: /etc/kubernetes
-      filesystem: root
       mode: 0755
   files:
     - path: /etc/sysctl.d/max-user-watches.conf
-      filesystem: root
       mode: 0644
       contents:
         inline: |
diff --git a/controllers.tf b/controllers.tf
index 1de068c..8432ff7 100644
--- a/controllers.tf
+++ b/controllers.tf
@@ -70,7 +70,7 @@ resource "digitalocean_tag" "controllers" {
 # Flatcar Linux controllers
 data "ct_config" "controllers" {
   count = var.controller_count
-  content = templatefile("${path.module}/cl/controller.yaml", {
+  content = templatefile("${path.module}/butane/controller.yaml", {
     # Cannot use cyclic dependencies on controllers or their DNS records
     etcd_name   = "etcd${count.index}"
     etcd_domain = "${var.cluster_name}-etcd${count.index}.${var.dns_zone}"
diff --git a/versions.tf b/versions.tf
index 0e6823f..3c8aa2f 100644
--- a/versions.tf
+++ b/versions.tf
@@ -6,7 +6,7 @@ terraform {
     null = ">= 2.1"
     ct = {
       source  = "poseidon/ct"
-      version = "~> 0.9"
+      version = "~> 0.11"
     }
     digitalocean = {
       source  = "digitalocean/digitalocean"
diff --git a/workers.tf b/workers.tf
index cdf2919..863248a 100644
--- a/workers.tf
+++ b/workers.tf
@@ -58,7 +58,7 @@ resource "digitalocean_tag" "workers" {
 
 # Flatcar Linux worker
 data "ct_config" "worker" {
-  content = templatefile("${path.module}/cl/worker.yaml", {
+  content = templatefile("${path.module}/butane/worker.yaml", {
     cluster_dns_service_ip = cidrhost(var.service_cidr, 10)
     cluster_domain_suffix  = var.cluster_domain_suffix
   })