diff --git a/Dockerfile b/Dockerfile
index 557c2af..4e24514 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM public.ecr.aws/lambda/python:3.8
+FROM public.ecr.aws/lambda/python:3.12
 
 # Copy function code
 COPY functions/replace-route/app.py ${LAMBDA_TASK_ROOT}
diff --git a/functions/replace-route/requirements.txt b/functions/replace-route/requirements.txt
index 434823c..e64d1e7 100644
--- a/functions/replace-route/requirements.txt
+++ b/functions/replace-route/requirements.txt
@@ -1 +1 @@
-boto3==1.24.62
+boto3==1.34.90
diff --git a/functions/replace-route/template.yaml b/functions/replace-route/template.yaml
index e2a480e..7c529cc 100644
--- a/functions/replace-route/template.yaml
+++ b/functions/replace-route/template.yaml
@@ -5,11 +5,11 @@ Resources:
     Type: AWS::Serverless::Function
     Properties:
       Handler: app.handler
-      Runtime: python3.8
+      Runtime: python3.12
       Timeout: 30
   ConnectivityTestFunction:
     Type: AWS::Serverless::Function
     Properties:
       Handler: app.connectivity_test_handler
-      Runtime: python3.8
+      Runtime: python3.12
       Timeout: 30
diff --git a/functions/replace-route/tests/pyproject.toml b/functions/replace-route/tests/pyproject.toml
new file mode 100644
index 0000000..bdf1c8b
--- /dev/null
+++ b/functions/replace-route/tests/pyproject.toml
@@ -0,0 +1,4 @@
+[tool.pytest.ini_options]
+filterwarnings = [
+    'ignore:datetime.datetime.utcnow\(\) is deprecated:DeprecationWarning', # https://github.com/boto/botocore/pull/3145
+]
diff --git a/functions/replace-route/tests/test_replace_route.py b/functions/replace-route/tests/test_replace_route.py
index 78e2d65..85ca32e 100644
--- a/functions/replace-route/tests/test_replace_route.py
+++ b/functions/replace-route/tests/test_replace_route.py
@@ -13,7 +13,7 @@
 
 import boto3
 import sure
-from moto import mock_autoscaling, mock_ec2, mock_iam, mock_lambda
+from moto import mock_aws
 
 sys.path.append('..')
 
@@ -25,7 +25,7 @@
 EXAMPLE_AMI_ID = "ami-12c6146b"
 
 
-@mock_ec2
+@mock_aws
 def setup_networking():
     az = f"{os.environ['AWS_DEFAULT_REGION']}a"
     ec2 = boto3.resource("ec2")
@@ -113,8 +113,7 @@ def verify_nat_gateway_route(mocked_networking):
         zero_route.should.have.key("NatGatewayId").equals(mocked_networking["nat_gw"])
 
 
-@mock_autoscaling
-@mock_ec2
+@mock_aws
 def test_handler():
     mocked_networking = setup_networking()
     ec2_client = boto3.client("ec2")
@@ -149,7 +148,7 @@ def test_handler():
     verify_nat_gateway_route(mocked_networking)
 
 
-@mock_iam
+@mock_aws
 def get_role():
     iam = boto3.client("iam")
     return iam.create_role(
@@ -177,8 +176,7 @@ def _process_lambda(func_str):
     return zip_output.read()
 
 
-@mock_lambda
-@mock_ec2
+@mock_aws
 @mock.patch('urllib.request.urlopen')
 def test_connectivity_test_handler(mock_urlopen):
     from app import connectivity_test_handler
diff --git a/functions/replace-route/tests/test_requirements.txt b/functions/replace-route/tests/test_requirements.txt
index ef1a99d..da53d7e 100644
--- a/functions/replace-route/tests/test_requirements.txt
+++ b/functions/replace-route/tests/test_requirements.txt
@@ -1,3 +1,3 @@
-moto[ec2,autoscaling,iam,awslambda]==4.0.6
-pytest==7.1.3
+moto==5.0.5
+pytest==8.1.1
 sure==2.0.0
diff --git a/modules/terraform-aws-alternat/lambda.tf b/modules/terraform-aws-alternat/lambda.tf
index 919346b..166f354 100644
--- a/modules/terraform-aws-alternat/lambda.tf
+++ b/modules/terraform-aws-alternat/lambda.tf
@@ -5,6 +5,7 @@ locals {
     : replace(upper(obj.az), "-", "_") => join(",", obj.route_table_ids)
   }
   has_ipv6_env_var = { "HAS_IPV6" = var.lambda_has_ipv6 }
+  lambda_runtime   = "python3.12"
 }
 
 data "archive_file" "lambda" {
@@ -28,7 +29,7 @@ resource "aws_lambda_function" "alternat_autoscaling_hook" {
 
   image_uri = var.lambda_package_type == "Image" ? "${var.alternat_image_uri}:${var.alternat_image_tag}" : null
 
-  runtime          = var.lambda_package_type == "Zip" ? "python3.8" : null
+  runtime          = var.lambda_package_type == "Zip" ? local.lambda_runtime : null
   handler          = var.lambda_package_type == "Zip" ? var.lambda_handlers.alternat_autoscaling_hook : null
   filename         = var.lambda_package_type == "Zip" ? data.archive_file.lambda[0].output_path : null
   source_code_hash = var.lambda_package_type == "Zip" ? data.archive_file.lambda[0].output_base64sha256 : null
@@ -138,7 +139,7 @@ resource "aws_lambda_function" "alternat_connectivity_tester" {
 
   image_uri = var.lambda_package_type == "Image" ? "${var.alternat_image_uri}:${var.alternat_image_tag}" : null
 
-  runtime          = var.lambda_package_type == "Zip" ? "python3.8" : null
+  runtime          = var.lambda_package_type == "Zip" ? local.lambda_runtime : null
   handler          = var.lambda_package_type == "Zip" ? var.lambda_handlers.connectivity_tester : null
   filename         = var.lambda_package_type == "Zip" ? data.archive_file.lambda[0].output_path : null
   source_code_hash = var.lambda_package_type == "Zip" ? data.archive_file.lambda[0].output_base64sha256 : null
diff --git a/modules/terraform-aws-alternat/versions.tf b/modules/terraform-aws-alternat/versions.tf
index 143b40d..869f362 100644
--- a/modules/terraform-aws-alternat/versions.tf
+++ b/modules/terraform-aws-alternat/versions.tf
@@ -4,7 +4,7 @@ terraform {
   required_providers {
     aws = {
       source  = "hashicorp/aws"
-      version = ">= 4"
+      version = ">= 5.32.0"
     }
   }
 }