I’m encountering an error while trying to deploy an AWS Lambda function using Terraform. Although python3.12 is supported by AWS Lambda and works in other projects, I receive the following error:

expected runtime to be one of [nodejs nodejs4.3 nodejs6.10 nodejs8.10 nodejs10.x nodejs12.x nodejs14.x nodejs16.x java8 java8.al2 java11 python2.7 python3.6 python3.7 python3.8 python3.9 dotnetcore1.0 dotnetcore2.0 dotnetcore2.1 dotnetcore3.1 dotnet6 nodejs4.3-edge go1.x ruby2.5 ruby2.7 provided provided.al2 nodejs18.x python3.10 java17 ruby3.2], got python3.12

Environment:

• Terraform Version: >=1.x
• AWS Provider Version: ~> 5.6.2

Terraform Configuration:

terraform {
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "~> 5.6.2"
    }
  }
required_version = ">= 1.8.3"
}

provider "aws" {
  region = "us-west-2"
}
resource "aws_lambda_function" "put_data_to_dynamodb" {
  filename         = data.archive_file.lambda_package.output_path
  function_name    = "test-lambda"
  role             = aws_iam_role.lambda_execution_role.arn
  handler          = "index.lambda_handler"
  source_code_hash = data.archive_file.lambda_package.output_base64sha256
  runtime          = "python3.12"
  
  environment {
    variables = {
      DYNAMODB_TABLE_NAME = aws_dynamodb_table.security_aggregation_table.name
    }
  }
}

Additional Information:

• python3.12 works perfectly fine in other projects using a similar configuration.
• I have verified that the AWS provider version is correctly specified as ~> 5.6.2.
• I have ensured that the AWS region supports python3.12.

What I’ve Tried:

1. Upgrading Terraform and AWS Provider: Ensured both are at the latest version.
2. Verified AWS Lambda Runtime Availability: Confirmed python3.12 is supported in my AWS region.
3. Running terraform init -upgrade: Ensured all providers are up-to-date.
4. Using Other Runtimes: Successfully deployed with python3.9 and python3.10, but need to use python3.12.

Despite these steps, I still receive the same error. Any insights or suggestions on resolving this issue would be greatly appreciated.