diff --git a/autoscaling_group/autoscaling_group.tf b/autoscaling_group/autoscaling_group.tf
index 0c92994..d7e4682 100644
--- a/autoscaling_group/autoscaling_group.tf
+++ b/autoscaling_group/autoscaling_group.tf
@@ -19,6 +19,7 @@ resource "aws_autoscaling_group" "default" {
   wait_for_elb_capacity     = var.wait_for_elb_capacity
   protect_from_scale_in     = var.protect_from_scale_in
   capacity_rebalance        = var.capacity_rebalance
+  
 
   dynamic "initial_lifecycle_hook" {
     for_each = var.initial_lifecycle_hooks
@@ -38,44 +39,20 @@ resource "aws_autoscaling_group" "default" {
       }
 
       override {
-        instance_type = length(var.instance_types) >= 1 ? var.instance_types.0 : ""
-      }
-
-      override {
-        instance_type = length(var.instance_types) >= 2 ? var.instance_types.1 : ""
-      }
-
-      override {
-        instance_type = length(var.instance_types) >= 3 ? var.instance_types.2 : ""
-      }
-
-      override {
-        instance_type = length(var.instance_types) >= 4 ? var.instance_types.3 : ""
-      }
-
-      override {
-        instance_type = length(var.instance_types) >= 5 ? var.instance_types.4 : ""
-      }
-
-      override {
-        instance_type = length(var.instance_types) >= 6 ? var.instance_types.5 : ""
-      }
-
-      override {
-        instance_type = length(var.instance_types) >= 7 ? var.instance_types.6 : ""
-      }
-
-      override {
-        instance_type = length(var.instance_types) >= 8 ? var.instance_types.7 : ""
-      }
-
-      override {
-        instance_type = length(var.instance_types) >= 9 ? var.instance_types.8 : ""
-      }
-
-      override {
-        instance_type = length(var.instance_types) >= 10 ? var.instance_types.9 : ""
+        instance_requirements { 
+          burstable_performance = var.burstable_performance 
+          excluded_instance_types = var.excluded_instance_types
+          instance_generations = var.instance_generations
+          memory_mib {
+            min = var.memory_mib
+          }
+          vcpu_count {
+            min = var.vcpu_count
+          }
+          cpu_manufacturers = var.cpu_manufacturers
+        }
       }
+      
     }
     instances_distribution {
       on_demand_allocation_strategy            = var.on_demand_allocation_strategy
diff --git a/autoscaling_group/variables.tf b/autoscaling_group/variables.tf
index 8ce0d5c..cb8eb98 100644
--- a/autoscaling_group/variables.tf
+++ b/autoscaling_group/variables.tf
@@ -83,6 +83,48 @@ variable "instance_types" {
   type        = list(string)
 }
 
+variable "burstable_performance" {
+  description = "Enable burstable performance instances" 
+  type = string 
+  default = "included"
+}
+
+variable "excluded_instance_types" {
+  description = "List of excluded instance types" 
+  type = list(string) 
+  default = [] 
+}
+
+variable "cpu_manufacturers" { 
+  description = "CPU manufacturer for instance selection" 
+  type = list(string) 
+  default = [] 
+}
+
+variable "architecture_type" { 
+  description = "Architecture type for instance selection" 
+  type = string 
+  default = "x86_64" 
+}
+
+variable "instance_generations" { 
+  description = "Instance generation for instance selection" 
+  type = list(string)
+  default = ["current"]
+}
+
+variable "memory_mib" { 
+  description = "Minimum memory (in MiB) for ABS instance selection" 
+  type = number 
+  default = 2048 
+}
+
+variable "vcpu_count" { 
+  description = "Minimum number of vCPUs for ABS instance selection" 
+  type = number 
+  default = 2 
+}
+
 variable "launch_template_id" {
   description = "Template ID"
 }
@@ -112,7 +154,7 @@ variable "min_elb_capacity" {
 
 variable "on_demand_allocation_strategy" {
   description = "Strategy to use when launching on-demand instances. Valid values: prioritized. Default: prioritized"
-  default     = "prioritized"
+  default     = "lowest-price"
 }
 
 variable "on_demand_base_capacity" {
diff --git a/autoscaling_group/versions.tf b/autoscaling_group/versions.tf
index 6bfa801..58d0cfc 100644
--- a/autoscaling_group/versions.tf
+++ b/autoscaling_group/versions.tf
@@ -1,10 +1,10 @@
 
 terraform {
-  required_version = ">= 0.13"
+  required_version = "~> 0.13"
   required_providers {
     aws = {
       source = "hashicorp/aws"
-      version = "3.76.1"
+      version = "~> 4.60.0"
     }
   }
 }
diff --git a/autoscaling_with_launch_template/autoscaling_group.tf b/autoscaling_with_launch_template/autoscaling_group.tf
index 7f84caa..a0804ee 100644
--- a/autoscaling_with_launch_template/autoscaling_group.tf
+++ b/autoscaling_with_launch_template/autoscaling_group.tf
@@ -66,7 +66,7 @@ resource "aws_autoscaling_group" "default" {
       }
 
     }
-
+    
     instances_distribution {
       on_demand_allocation_strategy            = var.on_demand_allocation_strategy
       on_demand_base_capacity                  = var.on_demand_base_capacity