diff --git a/CHANGELOG.md b/CHANGELOG.md
index 48e27b9..c227373 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,27 @@
 <!-- markdownlint-disable MD041 -->
+## 2.0.0 (XXXXXX XX, 202X)
+
+BREAKING CHANGES:
+
+* dependencies: updating to `v2.0.0` minimum of terraform.
+* dependencies: updating to `v3.40.0` minimum of hashicorp/azurerm provider.
+
+ENHANCEMENTS:
+
+* The `sku.capacity` parameter changes the `string` type to `number` and is now an optional parameter.
+* The `autoscale_configuration.min_capacity` parameter changes type `string` to `number`.
+* The `autoscale_configuration.max_capacity` parameter changes type `string` to `number`.
+
+FEATURES:
+
+* **New Parameter**:
+
+BUG FIXES:
+
+DEPRECATIONS:
+
+* **Parameter**:
+
 ## 1.2.0 (January 27, 2022)
 
 FEATURES:
diff --git a/README.md b/README.md
index 2608da9..ea31c57 100644
--- a/README.md
+++ b/README.md
@@ -25,6 +25,7 @@ The following parameters are supported:
 |location|The location/region where the Application Gateway is created.|`string`|n/a|yes|
 |tags|A mapping of tags to assign to the resource.|`map(string)`|`{}`|no|
 |sku|A mapping with the sku configuration of the application gateway.|`object({})`|n/a|yes|
+|autoscale\_configuration|A mapping with the autoscale configuration of the application gateway.|`object({})`|`null`|no|
 |subnet\_id|The ID of the Subnet which the Application Gateway should be connected to.|`string`|n/a|yes|
 |waf\_configuration|A mapping with the waf configuration of the application gateway.|`object({})`|`{}`|no|
 |frontend\_ip\_configuration|A mapping the front ip configuration.|`object({})`|n/a|yes|
diff --git a/variables.tf b/variables.tf
index fa1ec92..4a58cc8 100644
--- a/variables.tf
+++ b/variables.tf
@@ -23,19 +23,19 @@ variable "sku" {
   type = object({
     tier     = string
     size     = string
-    capacity = number
+    capacity = optional(number)
   })
   description = "A mapping with the sku configuration of the application gateway."
 }
 
-# variable "autoscale_configuration" {
-#   type = object({
-#     min_capacity = number
-#     max_capacity = number
-#   })
-#   default     = null
-#   description = "A mapping with the autoscale configuration of the application gateway."
-# }
+variable "autoscale_configuration" {
+  type = object({
+    min_capacity = number
+    max_capacity = number
+  })
+  default     = null
+  description = "A mapping with the autoscale configuration of the application gateway."
+}
 
 variable "subnet_id" {
   type        = string