```hcl
# Terraform version and plugin versions

terraform {
  required_version = ">= 0.13.0, < 2.0.0"
  required_providers {
    google   = ">= 2.19, < 5.0"
    template = "~> 2.2"
    null     = "~> 3.1"

    ct = {
      source  = "poseidon/ct"
      version = "~> 0.9"
    }
  }
}
```

Fix null provider version constraint on Google Cloud
user
```hcl
# Terraform version and plugin versions

terraform {
  required_version = ">= 0.13.0, < 2.0.0"
  required_providers {
    google   = ">= 2.19, < 5.0"
    template = "~> 2.2"
    null     = ">= 2.1"

    ct = {
      source  = "poseidon/ct"
      version = "~> 0.9"
    }
  }
}
```
assistant