diff --git a/base/libvirtd.tf b/base/libvirtd.tf
index 61aaa6c..2cad44e 100644
--- a/base/libvirtd.tf
+++ b/base/libvirtd.tf
@@ -1,12 +1,21 @@
 # https://github.com/dmacvicar/terraform-provider-libvirt/blob/master/website/docs/r
 
 terraform {
-  required_version = ">= 0.12"
+
 
   required_providers {
-    null     = "~> 2.1"
-    template = "~> 2.1"
-    libvirt  = ">= 0.0.0"
+    null = {
+      source  = "hashicorp/null"
+      version = "~> 2.1"
+    }
+    template = {
+      source  = "hashicorp/template"
+      version = "~> 2.1"
+    }
+    libvirt = {
+      source  = "dmacvicar/libvirt"
+      version = ">= 0.6.3"
+    }
   }
 
   backend "etcdv3" {
diff --git a/base/versions.tf b/base/versions.tf
new file mode 100644
index 0000000..6b6318d
--- /dev/null
+++ b/base/versions.tf
@@ -0,0 +1,3 @@
+terraform {
+  required_version = ">= 0.13"
+}
diff --git a/stack/libvirtd.tf b/stack/libvirtd.tf
index 3145a24..a19af1f 100644
--- a/stack/libvirtd.tf
+++ b/stack/libvirtd.tf
@@ -4,9 +4,18 @@ terraform {
   required_version = ">= 0.12"
 
   required_providers {
-    null     = "~> 2.1"
-    template = "~> 2.1"
-    libvirt  = ">= 0.0.0"
+    null = {
+      source  = "hashicorp/null"
+      version = "~> 2.1"
+    }
+    template = {
+      source  = "hashicorp/template"
+      version = "~> 2.1"
+    }
+    libvirt = {
+      source = "dmacvicar/libvirt"
+      version = ">= 0.6.3"
+    }
   }
 
   backend "etcdv3" {
diff --git a/stack/versions.tf b/stack/versions.tf
new file mode 100644
index 0000000..6b6318d
--- /dev/null
+++ b/stack/versions.tf
@@ -0,0 +1,3 @@
+terraform {
+  required_version = ">= 0.13"
+}