diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0284203..4a75be1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+## 3.5.4
+
+- Vault 1.5.3
+- Fix form script
+- Remove deprecated use_vault_oss configuration
+- Update documentation
+
 ## 3.5.3
 
 - Upgrade for Terraform 0.13 compatibility
diff --git a/README.md b/README.md
index 86d0279..07bc9c3 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,6 @@ _Diagram of a Vaultron cluster with Consul storage flavor_
       - [TF_VAR_docker_host](#tf_var_docker_host)
       - [TF_VAR_vault_flavor (Vault v1.4.0-)](#tf_var_vault_flavor-vault-v140)
       - [TF_VAR_datacenter_name](#tf_var_datacenter_name)
-      - [TF_VAR_use_vault_oss](#tf_var_use_vault_oss)
       - [TF_VAR_vault_server_log_format (Vault v0.10.0-)](#tf_var_vault_server_log_format-vault-v0100)
       - [TF_VAR_vault_server_log_level](#tf_var_vault_server_log_level)
       - [TF_VAR_consul_log_level](#tf_var_consul_log_level)
@@ -566,15 +565,6 @@ Vault datacenter name
 - Acceptable values:
   - _alphanumeric string_
 
-#### TF_VAR_use_vault_oss
-
-`1` to use OSS Vault binaries from releases.hashicorp.com or `0` when using custom binaries
-
-- Default: `1`
-- Acceptable values:
-  - `0`
-  - `1`
-
 #### TF_VAR_vault_server_log_format (Vault v0.10.0+)
 
 A valid Vault server log format
diff --git a/black_lion/main.tf b/black_lion/main.tf
index 578c8da..3b83db8 100644
--- a/black_lion/main.tf
+++ b/black_lion/main.tf
@@ -22,9 +22,6 @@ variable "datacenter_name" {
 variable "vault_version" {
 }
 
-variable "use_vault_oss" {
-}
-
 variable "vault_ent_id" {
 }
 
diff --git a/black_lion/templates/oss/vault_config_1.5.1.hcl b/black_lion/templates/oss/vault_config_1.5.1.hcl
index 1f73c8b..ccb587e 100644
--- a/black_lion/templates/oss/vault_config_1.5.1.hcl
+++ b/black_lion/templates/oss/vault_config_1.5.1.hcl
@@ -1,4 +1,4 @@
-# Vault OSS v1.5.0
+# Vault OSS v1.5.1
 
 # -----------------------------------------------------------------------
 # Global configuration
diff --git a/black_lion/templates/oss/vault_config_1.5.2.hcl b/black_lion/templates/oss/vault_config_1.5.2.hcl
index 1f73c8b..def4950 100644
--- a/black_lion/templates/oss/vault_config_1.5.2.hcl
+++ b/black_lion/templates/oss/vault_config_1.5.2.hcl
@@ -1,4 +1,4 @@
-# Vault OSS v1.5.0
+# Vault OSS v1.5.2
 
 # -----------------------------------------------------------------------
 # Global configuration
diff --git a/black_lion/templates/oss/vault_config_1.5.3.hcl b/black_lion/templates/oss/vault_config_1.5.3.hcl
new file mode 100644
index 0000000..2e6527f
--- /dev/null
+++ b/black_lion/templates/oss/vault_config_1.5.3.hcl
@@ -0,0 +1,32 @@
+# Vault OSS v1.5.3
+
+# -----------------------------------------------------------------------
+# Global configuration
+# -----------------------------------------------------------------------
+
+api_addr         = "${api_addr}"
+cluster_name     = "${cluster_name}"
+cluster_address  = "${cluster_address}"
+disable_mlock    = "${disable_mlock}"
+log_level        = "${log_level}"
+ui               = true
+plugin_directory = "/vault/plugins"
+
+# -----------------------------------------------------------------------
+# Listener configuration
+# -----------------------------------------------------------------------
+
+listener "tcp" {
+  address       = "${address}"
+  tls_cert_file = "/etc/ssl/certs/vault-server.crt"
+  tls_key_file  = "/etc/ssl/vault-server.key"
+}
+
+# -----------------------------------------------------------------------
+# Enable Prometheus metrics by default
+# -----------------------------------------------------------------------
+
+telemetry {
+  prometheus_retention_time = "30s"
+  disable_hostname          = false
+}
diff --git a/flavors/consul/vaultron.tf b/flavors/consul/vaultron.tf
index 2e9c548..21b8da3 100644
--- a/flavors/consul/vaultron.tf
+++ b/flavors/consul/vaultron.tf
@@ -12,7 +12,7 @@ terraform {
 
 # Set TF_VAR_vault_version to override this
 variable "vault_version" {
-  default = "1.5.2"
+  default = "1.5.3"
 }
 
 # Set TF_VAR_consul_version to override this
@@ -64,11 +64,6 @@ variable "vault_flavor" {
   default = "consul"
 }
 
-# Set TF_VAR_use_vault_oss to override this
-variable "use_vault_oss" {
-  default = "1"
-}
-
 # Set TF_VAR_vault_ent_id to override this
 variable "vault_ent_id" {
   default = "vault:latest"
@@ -260,7 +255,6 @@ module "vaultron" {
   consul_server_ips            = module.consul_cluster.consul_oss_server_ips
   consul_client_ips            = module.consul_cluster.consul_client_ips
   disable_clustering           = var.disable_clustering
-  use_vault_oss                = var.use_vault_oss
   vault_cluster_name           = var.vault_cluster_name
   vault_custom_config_template = var.vault_custom_config_template
   vault_custom_instance_count  = var.vault_custom_instance_count
diff --git a/flavors/raft/vaultron.tf b/flavors/raft/vaultron.tf
index 081242c..4e7d677 100644
--- a/flavors/raft/vaultron.tf
+++ b/flavors/raft/vaultron.tf
@@ -12,7 +12,7 @@ terraform {
 
 # Set TF_VAR_vault_version to override this
 variable "vault_version" {
-  default = "1.5.2"
+  default = "1.5.3"
 }
 
 # -----------------------------------------------------------------------
@@ -59,11 +59,6 @@ variable "vault_flavor" {
   default = "raft"
 }
 
-# Set TF_VAR_use_vault_oss to override this
-variable "use_vault_oss" {
-  default = "1"
-}
-
 # Set TF_VAR_vault_ent_id to override this
 variable "vault_ent_id" {
   default = "vault:latest"
@@ -173,7 +168,6 @@ module "telemetry" {
 module "vaultron" {
   source                       = "../../black_lion"
   datacenter_name              = var.datacenter_name
-  use_vault_oss                = var.use_vault_oss
   vault_cluster_name           = var.vault_cluster_name
   vault_custom_config_template = var.vault_custom_config_template
   vault_custom_instance_count  = var.vault_custom_instance_count
diff --git a/form b/form
index 062d165..c389826 100755
--- a/form
+++ b/form
@@ -50,6 +50,7 @@ check_instance_count() {
   # | Raft   |        5          |         0          |
   # |--------|-------------------|--------------------|
   #
+
   case "$TF_VAR_vault_flavor" in
           consul)
               export TF_VAR_consul_oss_instance_count=3
@@ -67,11 +68,14 @@ check_instance_count() {
               export TF_VAR_consul_oss_instance_count=0
               if [ -n "$TF_VAR_vault_custom_instance_count" ]
                 then
-                  export TF_VAR_vault_custom_instance_count=5 \
-                             TF_VAR_vault_oss_instance_count=0
-                else
-                  export TF_VAR_vault_custom_instance_count=0 \
+                  if [ "$TF_VAR_vault_custom_instance_count" = "0" ]
+                    then
+                      export TF_VAR_vault_custom_instance_count=0 \
                              TF_VAR_vault_oss_instance_count=5
+                    else
+                      export TF_VAR_vault_custom_instance_count=5 \
+                             TF_VAR_vault_oss_instance_count=0
+                  fi
               fi
               ;;
           *)
@@ -215,18 +219,14 @@ check_raft_version() {
           then
             if [ "$TF_VAR_vault_oss_instance_count" != 5 ]
               then
-                msg alert "Cannot form Vaultron Integrated Storage flavor with incorrect instance count."
-                msg info "Please 'export TF_VAR_vault_oss_instance_count=5' and try again."
-                exit 1
+                export TF_VAR_vault_oss_instance_count=5
             fi
         fi
     if [ "$TF_VAR_vault_oss_instance_count" = 0 ]
       then
         if [ "$TF_VAR_vault_custom_instance_count" != 5 ]
           then
-            msg alert "Cannot form Vaultron Integrated Storage flavor with incorrect instance count."
-            msg info "Please 'export TF_VAR_vault_custom_instance_count=5' and try again."
-            exit 1
+            export TF_VAR_vault_custom_instance_count=5
         fi
       fi
     fi
@@ -241,7 +241,7 @@ check_flavor
 check_instance_count $TF_VAR_vault_flavor
 check_raft_version
 check_telemetry
-if [ "$(check_katakoda)" = "0" ]
+if [ "$(check_katacoda)" = "0" ]
   then
     check_docker
 fi
diff --git a/skydome b/skydome
index 5276da7..ec88bc4 100644
--- a/skydome
+++ b/skydome
@@ -91,7 +91,7 @@ fi
 # -----------------------------------------------------------------------
 # Check for signs of execution in a Katakoda environment
 # -----------------------------------------------------------------------
-check_katakoda() {
+check_katacoda() {
   if [ "$(hostname)" = "host01" ]
     then
       if [ "$(hostname)" = "host01" ]
diff --git a/version.txt b/version.txt
index 444877d..65afb3b 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-3.5.3
+3.5.4