failed to determine the configuration's provider…

Error message

failed to determine the configuration's provider requirements: %s

What it means

Config.VerifyDependencySelections first computes the configuration's provider requirements via c.ProviderRequirements(). If that returns diagnostics with errors, Terraform cannot proceed to compare requirements against the lock file. The comment notes this is rare and stems from version-constraint string parsing differences between the config loader and the requirements resolver.

Solutions

Review all required_providers blocks in the configuration and any referenced modules for malformed or overly complex version constraints.
Simplify version constraint expressions to standard forms (e.g., ~> 3.0, >= 2.0, < 4.0).
Run terraform fmt and terraform validate to catch syntax issues in the config.
If the error appeared after a module update, check the upstream module's required_providers for changes.
File a bug with the Terraform team if the constraint is valid HCL but triggers this internal inconsistency.

Example fix

# before — complex constraint that triggers parser mismatch
required_providers {
  aws = {
    source  = "hashicorp/aws"
    version = "~> 3.0 && != 3.7.0, >= 3.5"
  }
}

# after — simplified standard constraint
required_providers {
  aws = {
    source  = "hashicorp/aws"
    version = "~> 3.5"
  }
}

Defensive patterns

Strategy: validation

Validate before calling

// Run terraform validate and check provider requirements before plan/apply
// In CI or pre-commit:
//   terraform fmt -check
//   terraform validate
//   terraform providers  // lists required providers for inspection

Prevention

Keep version constraint expressions in required_providers simple and standard.
Run terraform validate as a CI step to catch constraint issues early.
Avoid compound constraint expressions with unusual operator combinations.
When updating modules, review their required_providers for new or changed constraints.

When it happens

Trigger: Calling VerifyDependencySelections (during terraform init/plan/apply) when ProviderRequirements() returns error diagnostics. Triggered by malformed version constraint strings in required_providers blocks that the loader accepts but the resolver rejects, or internal inconsistencies in the parsed config module tree.

Common situations: A required_providers version constraint uses syntax that parses differently in two code paths (e.g., complex compound constraints with whitespace or operators). Module inheritance of provider requirements creates a conflict the resolver can't reconcile. Config corruption from a partial edit or merge conflict. Bug in the constraint parser for an edge-case expression.

Related errors

AI-assisted analysis of hashicorp/terraform@d32a084675 (2026-08-11). Data as JSON: /api/errors/79b01f1f9a5b87fd. Report an issue: GitHub.

Appendix: source

Thrown at internal/configs/config.go:271

// It's typically the responsibility of "terraform init" to change the locked
// dependencies to conform with the configuration, and so
// VerifyDependencySelections is intended for other commands to check whether
// it did so correctly and to catch if anything has changed in configuration
// since the last "terraform init" which requires re-initialization. However,
// it's up to the caller to decide how to advise users recover from these
// errors, because the advise can vary depending on what operation the user
// is attempting.
func (c *Config) VerifyDependencySelections(depLocks *depsfile.Locks) []error {
	var errs []error

	reqs, diags := c.ProviderRequirements()
	if diags.HasErrors() {
		// It should be very unusual to get here, but unfortunately we can
		// end up here in some edge cases where the config loader doesn't
		// process version constraint strings in exactly the same way as
		// the requirements resolver. (See the addProviderRequirements method
		// for more information.)
		errs = append(errs, fmt.Errorf("failed to determine the configuration's provider requirements: %s", diags.Error()))
	}

	for providerAddr, constraints := range reqs {
		if !depsfile.ProviderIsLockable(providerAddr) {
			continue // disregard builtin providers, and such
		}
		if depLocks != nil && depLocks.ProviderIsOverridden(providerAddr) {
			// The "overridden" case is for unusual special situations like
			// dev overrides, so we'll explicitly note it in the logs just in
			// case we see bug reports with these active and it helps us
			// understand why we ended up using the "wrong" plugin.
			log.Printf("[DEBUG] Config.VerifyDependencySelections: skipping %s because it's overridden by a special configuration setting", providerAddr)
			continue
		}

		var lock *depsfile.ProviderLock
		if depLocks != nil { // Should always be true in main code, but unfortunately sometimes not true in old tests that don't fill out arguments completely
			lock = depLocks.Provider(providerAddr)

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