diff --git a/CHANGES.md b/CHANGES.md
index ac50d7cc..fa297944 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -4,7 +4,6 @@ Notable changes between versions.
 
 ## Latest
 
-
 ## v1.13.5
 
 * Kubernetes [v1.13.5](https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.13.md#v1135)
@@ -12,6 +11,7 @@ Notable changes between versions.
   * Reverse DNS lookups for service IPv4 addresses unchanged
 * Upgrade Calico from v3.5.2 to [v3.6.0](https://docs.projectcalico.org/v3.6/release-notes/) ([#430](https://github.com/poseidon/typhoon/pull/430))
   * Change pod IPAM from `host-local` to `calico-ipam`. `pod_cidr` is still divided into `/24` subnets per node, but managed as `ippools` and `ipamblocks`
+* Suggest updating [terraform-provider-ct](https://github.com/coreos/terraform-provider-ct) from v0.3.0 to [v0.3.1](https://github.com/coreos/terraform-provider-ct/releases/tag/v0.3.1) ([#434](https://github.com/poseidon/typhoon/pull/434))
 
 #### AWS
 
@@ -21,7 +21,7 @@ Notable changes between versions.
 
 * Change the default iPXE kernel and initrd download protocol from HTTP to HTTPS ([#420](https://github.com/poseidon/typhoon/pull/420))
   * Require an iPXE-enabled network boot environment with support for TLS downloads. PXE clients must chainload to iPXE firmware compiled with `DOWNLOAD_PROTO_HTTPS` [enabled](https://ipxe.org/crypto). (**action required**)
-  * Affects Container Linux and Flatcar Linux install profiles that pull from public images (default). No affect when `cached_install=true` or Fedora Atomic, since those download from Matchbox
+  * Only affects Container Linux and Flatcar Linux install profiles that pull public images (default)
   * Add `download_protocol` variable. Recognizing boot firmware TLS support is difficult in some environments, set the protocol to "http" for the old behavior (discouraged)
 
 #### DigitalOcean
diff --git a/docs/atomic/aws.md b/docs/atomic/aws.md
index 97f1d8df..433b30db 100644
--- a/docs/atomic/aws.md
+++ b/docs/atomic/aws.md
@@ -44,7 +44,7 @@ Configure the AWS provider to use your access key credentials in a `providers.tf
 
 ```tf
 provider "aws" {
-  version = "~> 2.1.0"
+  version = "~> 2.3.0"
   alias   = "default"
 
   region                  = "eu-central-1"
diff --git a/docs/atomic/google-cloud.md b/docs/atomic/google-cloud.md
index 8ef22066..25e22e24 100644
--- a/docs/atomic/google-cloud.md
+++ b/docs/atomic/google-cloud.md
@@ -45,7 +45,7 @@ Configure the Google Cloud provider to use your service account key, project-id,
 
 ```tf
 provider "google" {
-  version = "~> 2.1.0"
+  version = "~> 2.2.0"
   alias   = "default"
 
   credentials = "${file("~/.config/google-cloud/terraform.json")}"
diff --git a/docs/cl/aws.md b/docs/cl/aws.md
index c43c1cec..7acd7fd8 100644
--- a/docs/cl/aws.md
+++ b/docs/cl/aws.md
@@ -24,9 +24,9 @@ Terraform v0.11.12
 Add the [terraform-provider-ct](https://github.com/coreos/terraform-provider-ct) plugin binary for your system to `~/.terraform.d/plugins/`, noting the final name.
 
 ```sh
-wget https://github.com/coreos/terraform-provider-ct/releases/download/v0.3.0/terraform-provider-ct-v0.3.0-linux-amd64.tar.gz
-tar xzf terraform-provider-ct-v0.3.0-linux-amd64.tar.gz
-mv terraform-provider-ct-v0.3.0-linux-amd64/terraform-provider-ct ~/.terraform.d/plugins/terraform-provider-ct_v0.3.0
+wget https://github.com/coreos/terraform-provider-ct/releases/download/v0.3.1/terraform-provider-ct-v0.3.1-linux-amd64.tar.gz
+tar xzf terraform-provider-ct-v0.3.1-linux-amd64.tar.gz
+mv terraform-provider-ct-v0.3.1-linux-amd64/terraform-provider-ct ~/.terraform.d/plugins/terraform-provider-ct_v0.3.1
 ```
 
 Read [concepts](/architecture/concepts/) to learn about Terraform, modules, and organizing resources. Change to your infrastructure repository (e.g. `infra`).
@@ -49,7 +49,7 @@ Configure the AWS provider to use your access key credentials in a `providers.tf
 
 ```tf
 provider "aws" {
-  version = "~> 2.1.0"
+  version = "~> 2.3.0"
   alias   = "default"
 
   region                  = "eu-central-1"
@@ -57,7 +57,7 @@ provider "aws" {
 }
 
 provider "ct" {
-  version = "0.3.0"
+  version = "0.3.1"
 }
 
 provider "local" {
diff --git a/docs/cl/azure.md b/docs/cl/azure.md
index 2804c368..5f128d99 100644
--- a/docs/cl/azure.md
+++ b/docs/cl/azure.md
@@ -27,9 +27,9 @@ Terraform v0.11.12
 Add the [terraform-provider-ct](https://github.com/coreos/terraform-provider-ct) plugin binary for your system to `~/.terraform.d/plugins/`, noting the final name.
 
 ```sh
-wget https://github.com/coreos/terraform-provider-ct/releases/download/v0.3.0/terraform-provider-ct-v0.3.0-linux-amd64.tar.gz
-tar xzf terraform-provider-ct-v0.3.0-linux-amd64.tar.gz
-mv terraform-provider-ct-v0.3.0-linux-amd64/terraform-provider-ct ~/.terraform.d/plugins/terraform-provider-ct_v0.3.0
+wget https://github.com/coreos/terraform-provider-ct/releases/download/v0.3.1/terraform-provider-ct-v0.3.1-linux-amd64.tar.gz
+tar xzf terraform-provider-ct-v0.3.1-linux-amd64.tar.gz
+mv terraform-provider-ct-v0.3.1-linux-amd64/terraform-provider-ct ~/.terraform.d/plugins/terraform-provider-ct_v0.3.1
 ```
 
 Read [concepts](/architecture/concepts/) to learn about Terraform, modules, and organizing resources. Change to your infrastructure repository (e.g. `infra`).
@@ -50,12 +50,12 @@ Configure the Azure provider in a `providers.tf` file.
 
 ```tf
 provider "azurerm" {
-  version = "~> 1.22.1"
+  version = "~> 1.23.0"
   alias   = "default"
 }
 
 provider "ct" {
-  version = "0.3.0"
+  version = "0.3.1"
 }
 
 provider "local" {
diff --git a/docs/cl/bare-metal.md b/docs/cl/bare-metal.md
index 9e7fed2b..ff49622a 100644
--- a/docs/cl/bare-metal.md
+++ b/docs/cl/bare-metal.md
@@ -125,9 +125,9 @@ mv terraform-provider-matchbox-v0.2.3-linux-amd64/terraform-provider-matchbox ~/
 Add the [terraform-provider-ct](https://github.com/coreos/terraform-provider-ct) plugin binary for your system to `~/.terraform.d/plugins/`, noting the final name.
 
 ```sh
-wget https://github.com/coreos/terraform-provider-ct/releases/download/v0.3.0/terraform-provider-ct-v0.3.0-linux-amd64.tar.gz
-tar xzf terraform-provider-ct-v0.3.0-linux-amd64.tar.gz
-mv terraform-provider-ct-v0.3.0-linux-amd64/terraform-provider-ct ~/.terraform.d/plugins/terraform-provider-ct_v0.3.0
+wget https://github.com/coreos/terraform-provider-ct/releases/download/v0.3.1/terraform-provider-ct-v0.3.1-linux-amd64.tar.gz
+tar xzf terraform-provider-ct-v0.3.1-linux-amd64.tar.gz
+mv terraform-provider-ct-v0.3.1-linux-amd64/terraform-provider-ct ~/.terraform.d/plugins/terraform-provider-ct_v0.3.1
 ```
 
 Read [concepts](/architecture/concepts/) to learn about Terraform, modules, and organizing resources. Change to your infrastructure repository (e.g. `infra`).
@@ -150,7 +150,7 @@ provider "matchbox" {
 }
 
 provider "ct" {
-  version = "0.3.0"
+  version = "0.3.1"
 }
 
 provider "local" {
diff --git a/docs/cl/digital-ocean.md b/docs/cl/digital-ocean.md
index 2ecd5993..7235a42e 100644
--- a/docs/cl/digital-ocean.md
+++ b/docs/cl/digital-ocean.md
@@ -24,9 +24,9 @@ Terraform v0.11.12
 Add the [terraform-provider-ct](https://github.com/coreos/terraform-provider-ct) plugin binary for your system to `~/.terraform.d/plugins/`, noting the final name.
 
 ```sh
-wget https://github.com/coreos/terraform-provider-ct/releases/download/v0.3.0/terraform-provider-ct-v0.3.0-linux-amd64.tar.gz
-tar xzf terraform-provider-ct-v0.3.0-linux-amd64.tar.gz
-mv terraform-provider-ct-v0.3.0-linux-amd64/terraform-provider-ct ~/.terraform.d/plugins/terraform-provider-ct_v0.3.0
+wget https://github.com/coreos/terraform-provider-ct/releases/download/v0.3.1/terraform-provider-ct-v0.3.1-linux-amd64.tar.gz
+tar xzf terraform-provider-ct-v0.3.1-linux-amd64.tar.gz
+mv terraform-provider-ct-v0.3.1-linux-amd64/terraform-provider-ct ~/.terraform.d/plugins/terraform-provider-ct_v0.3.1
 ```
 
 Read [concepts](/architecture/concepts/) to learn about Terraform, modules, and organizing resources. Change to your infrastructure repository (e.g. `infra`).
@@ -56,7 +56,7 @@ provider "digitalocean" {
 }
 
 provider "ct" {
-  version = "0.3.0"
+  version = "0.3.1"
 }
 
 provider "local" {
diff --git a/docs/cl/google-cloud.md b/docs/cl/google-cloud.md
index bc8fe9a2..393d5840 100644
--- a/docs/cl/google-cloud.md
+++ b/docs/cl/google-cloud.md
@@ -24,9 +24,9 @@ Terraform v0.11.12
 Add the [terraform-provider-ct](https://github.com/coreos/terraform-provider-ct) plugin binary for your system to `~/.terraform.d/plugins/`, noting the final name.
 
 ```sh
-wget https://github.com/coreos/terraform-provider-ct/releases/download/v0.3.0/terraform-provider-ct-v0.3.0-linux-amd64.tar.gz
-tar xzf terraform-provider-ct-v0.3.0-linux-amd64.tar.gz
-mv terraform-provider-ct-v0.3.0-linux-amd64/terraform-provider-ct ~/.terraform.d/plugins/terraform-provider-ct_v0.3.0
+wget https://github.com/coreos/terraform-provider-ct/releases/download/v0.3.1/terraform-provider-ct-v0.3.1-linux-amd64.tar.gz
+tar xzf terraform-provider-ct-v0.3.1-linux-amd64.tar.gz
+mv terraform-provider-ct-v0.3.1-linux-amd64/terraform-provider-ct ~/.terraform.d/plugins/terraform-provider-ct_v0.3.1
 ```
 
 Read [concepts](/architecture/concepts/) to learn about Terraform, modules, and organizing resources. Change to your infrastructure repository (e.g. `infra`).
@@ -49,7 +49,7 @@ Configure the Google Cloud provider to use your service account key, project-id,
 
 ```tf
 provider "google" {
-  version = "~> 2.1.0"
+  version = "~> 2.2.0"
   alias   = "default"
 
   credentials = "${file("~/.config/google-cloud/terraform.json")}"
@@ -58,7 +58,7 @@ provider "google" {
 }
 
 provider "ct" {
-  version = "0.3.0"
+  version = "0.3.1"
 }
 
 provider "local" {
diff --git a/docs/topics/maintenance.md b/docs/topics/maintenance.md
index 9baca2db..c452bb8b 100644
--- a/docs/topics/maintenance.md
+++ b/docs/topics/maintenance.md
@@ -202,9 +202,9 @@ First, [migrate](#terraform-plugins-directory) to the Terraform 3rd-party plugin
 Add the [terraform-provider-ct](https://github.com/coreos/terraform-provider-ct) plugin binary for your system to `~/.terraform.d/plugins/`, noting the final name.
 
 ```sh
-wget https://github.com/coreos/terraform-provider-ct/releases/download/v0.3.0/terraform-provider-ct-v0.3.0-linux-amd64.tar.gz
-tar xzf terraform-provider-ct-v0.3.0-linux-amd64.tar.gz
-mv terraform-provider-ct-v0.3.0-linux-amd64/terraform-provider-ct ~/.terraform.d/plugins/terraform-provider-ct_v0.3.0
+wget https://github.com/coreos/terraform-provider-ct/releases/download/v0.3.1/terraform-provider-ct-v0.3.1-linux-amd64.tar.gz
+tar xzf terraform-provider-ct-v0.3.1-linux-amd64.tar.gz
+mv terraform-provider-ct-v0.3.1-linux-amd64/terraform-provider-ct ~/.terraform.d/plugins/terraform-provider-ct_v0.3.1
 ```
 
 Binary names are versioned. This enables the ability to upgrade different plugins and have clusters pin different versions.
@@ -215,6 +215,7 @@ $ tree ~/.terraform.d/
 └── plugins
     ├── terraform-provider-ct_v0.2.1
     ├── terraform-provider-ct_v0.3.0
+    ├── terraform-provider-ct_v0.3.1
     └── terraform-provider-matchbox_v0.2.3
 ```
 
diff --git a/requirements.txt b/requirements.txt
index 899424e7..4e29be56 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 mkdocs==1.0.4
-mkdocs-material==4.0.2
+mkdocs-material==4.1.0
 pygments==2.2.0
 pymdown-extensions==5.0.0