How to fix no available releases match the given constraints in Terraform

First, understand what constraints are being applied. Run:

terraform providers

This shows all provider dependencies and their required versions across your configuration and all modules. Look for the provider that has conflicting constraints.

An outdated ~/.terraform.d/plugins directory can cause version resolution failures. Move it temporarily to rule this out:

mv ~/.terraform.d/plugins ~/.terraform.d/plugins.old

Then retry terraform init. If this works, the issue was cached plugins. Keep the plugins.old directory removed or clean it out.

Look at the error message—it shows which constraints conflict. Find the modules that are imposing these constraints. Check:

1. Your root module's required_providers block
2. Each module call in your configuration (grep -r "required_providers" in modules/)
3. The modules/ directory for sub-module constraints

The terraform providers command output shows which module is requiring which version.

Once you identify conflicting modules, pin their versions to ones that are compatible with your provider requirements.

For example, if your root config requires aws ~> 5.0 but a new module requires aws >= 6.0, pin the module to an earlier version:

module "networking" {
  source  = "terraform-aws-modules/vpc/aws"
  version = "5.1.0"  # Pin to a version compatible with your provider
  # ... config
}

Then run terraform init -upgrade to re-evaluate constraints.

Alternatively, relax your provider version constraints to allow the versions required by modules. For example, change from ~> 5.0 to >= 5.0, < 7.0.

terraform {
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = ">= 5.0, < 7.0"  # Allows more flexibility
    }
  }
}

Run terraform init -upgrade after making changes:

terraform init -upgrade

Once init succeeds, ensure your .terraform.lock.hcl file is committed to version control. This file locks all provider versions, preventing different team members from experiencing different constraint resolution results.

git add .terraform.lock.hcl
git commit -m "Lock provider versions"

Always commit this file so the entire team uses identical versions.