diff --git a/README.md b/README.md
index 054615ca..6026c974 100644
--- a/README.md
+++ b/README.md
@@ -78,6 +78,7 @@ environment. The following assumptions are made about the test environment:
 
 - It has one node named `pve`
 - The node has local storages named `local` and `local-lvm`
+- The "Snippets" content type is enabled in `local` storage
 
 Create `examples/terraform.tfvars` with the following variables:
 
diff --git a/docs/resources/virtual_environment_vm.md b/docs/resources/virtual_environment_vm.md
index 9fd785f9..14af52c4 100644
--- a/docs/resources/virtual_environment_vm.md
+++ b/docs/resources/virtual_environment_vm.md
@@ -370,8 +370,8 @@ output "ubuntu_vm_public_key" {
     - `sv` - Swedish.
     - `tr` - Turkish.
 - `kvm_arguments` - (Optional) Arbitrary arguments passed to kvm.
-- `machine` - (Optional) The VM machine type (defaults to `i440fx`).
-    - `i440fx` - Standard PC (i440FX + PIIX, 1996).
+- `machine` - (Optional) The VM machine type (defaults to `pc`).
+    - `pc` - Standard PC (i440FX + PIIX, 1996).
     - `q35` - Standard PC (Q35 + ICH9, 2009).
 - `memory` - (Optional) The memory configuration.
     - `dedicated` - (Optional) The dedicated memory in megabytes (defaults
diff --git a/example/resource_virtual_environment_certificate.tf b/example/resource_virtual_environment_certificate.tf
deleted file mode 100644
index b03d8c68..00000000
--- a/example/resource_virtual_environment_certificate.tf
+++ /dev/null
@@ -1,64 +0,0 @@
-resource "proxmox_virtual_environment_certificate" "example" {
-  certificate = tls_self_signed_cert.proxmox_virtual_environment_certificate.cert_pem
-  node_name   = data.proxmox_virtual_environment_nodes.example.names[0]
-  private_key = tls_private_key.proxmox_virtual_environment_certificate.private_key_pem
-}
-
-resource "tls_private_key" "proxmox_virtual_environment_certificate" {
-  algorithm = "RSA"
-  rsa_bits  = 2048
-}
-
-resource "tls_self_signed_cert" "proxmox_virtual_environment_certificate" {
-  key_algorithm   = tls_private_key.proxmox_virtual_environment_certificate.algorithm
-  private_key_pem = tls_private_key.proxmox_virtual_environment_certificate.private_key_pem
-
-  subject {
-    common_name  = "example.com"
-    organization = "Terraform Provider for Proxmox"
-  }
-
-  validity_period_hours = 8760
-
-  allowed_uses = [
-    "key_encipherment",
-    "digital_signature",
-    "server_auth",
-  ]
-}
-
-output "resource_proxmox_virtual_environment_certificate_example_expiration_date" {
-  value = proxmox_virtual_environment_certificate.example.expiration_date
-}
-
-output "resource_proxmox_virtual_environment_certificate_example_file_name" {
-  value = proxmox_virtual_environment_certificate.example.file_name
-}
-
-output "resource_proxmox_virtual_environment_certificate_example_issuer" {
-  value = proxmox_virtual_environment_certificate.example.issuer
-}
-
-output "resource_proxmox_virtual_environment_certificate_example_public_key_size" {
-  value = proxmox_virtual_environment_certificate.example.public_key_size
-}
-
-output "resource_proxmox_virtual_environment_certificate_example_public_key_type" {
-  value = proxmox_virtual_environment_certificate.example.public_key_type
-}
-
-output "resource_proxmox_virtual_environment_certificate_example_ssl_fingerprint" {
-  value = proxmox_virtual_environment_certificate.example.ssl_fingerprint
-}
-
-output "resource_proxmox_virtual_environment_certificate_example_start_date" {
-  value = proxmox_virtual_environment_certificate.example.start_date
-}
-
-output "resource_proxmox_virtual_environment_certificate_example_subject" {
-  value = proxmox_virtual_environment_certificate.example.subject
-}
-
-output "resource_proxmox_virtual_environment_certificate_example_subject_alternative_names" {
-  value = proxmox_virtual_environment_certificate.example.subject_alternative_names
-}
diff --git a/proxmoxtf/resource/validator/vm.go b/proxmoxtf/resource/validator/vm.go
index 725cb915..4cac5d09 100644
--- a/proxmoxtf/resource/validator/vm.go
+++ b/proxmoxtf/resource/validator/vm.go
@@ -185,6 +185,14 @@ func KeyboardLayout() schema.SchemaValidateDiagFunc {
 	}, false))
 }
 
+// MachineType is a schema validation function for machine types.
+func MachineType() schema.SchemaValidateDiagFunc {
+	//nolint:lll
+	r := regexp.MustCompile(`^$|^(pc|pc(-i440fx)?-\d+(\.\d+)+(\+pve\d+)?(\.pxe)?|q35|pc-q35-\d+(\.\d+)+(\+pve\d+)?(\.pxe)?|virt(?:-\d+(\.\d+)+)?(\+pve\d+)?)$`)
+
+	return validation.ToDiagFunc(validation.StringMatch(r, "must be a valid machine type"))
+}
+
 // Timeout is a schema validation function for timeouts.
 func Timeout() schema.SchemaValidateDiagFunc {
 	return validation.ToDiagFunc(func(i interface{}, k string) ([]string, []error) {
diff --git a/proxmoxtf/resource/validator/vm_test.go b/proxmoxtf/resource/validator/vm_test.go
index 0e709289..0e72c15a 100644
--- a/proxmoxtf/resource/validator/vm_test.go
+++ b/proxmoxtf/resource/validator/vm_test.go
@@ -12,7 +12,7 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
-func Test_getCPUTypeValidator(t *testing.T) {
+func TestCPUType(t *testing.T) {
 	t.Parallel()
 
 	tests := []struct {
@@ -43,3 +43,37 @@ func Test_getCPUTypeValidator(t *testing.T) {
 		})
 	}
 }
+
+func TestMachineType(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name  string
+		value string
+		valid bool
+	}{
+		{"empty is valid", "", true},
+		{"invalid", "invalid", false},
+		{"valid q35", "q35", true},
+		{"valid pc-q35", "pc-q35-2.3", true},
+		{"valid i440fx", "pc-i440fx-3.1+pve0", true},
+		{"valid virt", "virt", true},
+		{"invalid i440fx", "i440fx", false},
+	}
+
+	for _, tt := range tests {
+		tt := tt
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+
+			f := MachineType()
+			res := f(tt.value, nil)
+
+			if tt.valid {
+				require.Empty(t, res, "validate: '%s'", tt.value)
+			} else {
+				require.NotEmpty(t, res, "validate: '%s'", tt.value)
+			}
+		})
+	}
+}
diff --git a/proxmoxtf/resource/vm.go b/proxmoxtf/resource/vm.go
index 910fc276..e8e843d3 100644
--- a/proxmoxtf/resource/vm.go
+++ b/proxmoxtf/resource/vm.go
@@ -1102,10 +1102,11 @@ func VM() *schema.Resource {
 				ValidateDiagFunc: validator.KeyboardLayout(),
 			},
 			mkResourceVirtualEnvironmentVMMachine: {
-				Type:        schema.TypeString,
-				Description: "The VM machine type, either default i440fx or q35",
-				Optional:    true,
-				Default:     dvResourceVirtualEnvironmentVMMachineType,
+				Type:             schema.TypeString,
+				Description:      "The VM machine type, either default `pc` or `q35`",
+				Optional:         true,
+				Default:          dvResourceVirtualEnvironmentVMMachineType,
+				ValidateDiagFunc: validator.MachineType(),
 			},
 			mkResourceVirtualEnvironmentVMMACAddresses: {
 				Type:        schema.TypeList,