diff --git a/bt/changelog.adoc b/bt/changelog.adoc
index 8edef54..6971d1a 100644
--- a/bt/changelog.adoc
+++ b/bt/changelog.adoc
@@ -1,5 +1,9 @@
 = bt
 
+== v0.12.0: New features
+
+* Invalidate init when the `.terraform.lock.hcl` file has been modified.
+
 == v0.11.0: New features
 
 * Add retries to stack components.
diff --git a/bt/terraform/build.go b/bt/terraform/build.go
index fbfeb5c..e8dfd0f 100644
--- a/bt/terraform/build.go
+++ b/bt/terraform/build.go
@@ -22,7 +22,7 @@ func buildCMD(ctx context.Context, parent *getoptions.GetOpt) *getoptions.GetOpt
 	opt.Bool("destroy", false)
 	opt.Bool("detailed-exitcode", false)
 	opt.Bool("dry-run", false)
-	opt.Bool("ignore-cache", false, opt.Description("Ignore the cache and re-run the plan"), opt.Alias("ic"))
+	opt.Bool("ignore-cache", false, opt.Description("Ignore the cache and re-run the init and plan"), opt.Alias("ic"))
 	opt.Bool("no-checks", false, opt.Description("Do not run pre-apply/post-apply checks"), opt.Alias("nc"))
 	opt.Bool("show", false, opt.Description("Show Terraform plan"))
 	opt.Bool("lock", false, opt.Description("Run 'terraform providers lock' after init"))
@@ -61,15 +61,6 @@ func BuildRun(ctx context.Context, opt *getoptions.GetOpt, args []string) error
 		}
 	}
 
-	initFn := func(ctx context.Context, opt *getoptions.GetOpt, args []string) error {
-		// TODO: Add logic to only run when files have been modified
-		initFile := filepath.Join(dir, ".tf.init")
-		if _, err := os.Stat(initFile); os.IsNotExist(err) {
-			return initRun(ctx, opt, args)
-		}
-		return nil
-	}
-
 	lockFn := func(ctx context.Context, opt *getoptions.GetOpt, args []string) error {
 		lockFile := filepath.Join(dir, ".tf.lock")
 		if _, err := os.Stat(lockFile); os.IsNotExist(err) {
@@ -83,7 +74,7 @@ func BuildRun(ctx context.Context, opt *getoptions.GetOpt, args []string) error
 	}
 
 	tm := dag.NewTaskMap()
-	tm.Add("init", initFn)
+	tm.Add("init", initRun)
 	if lock {
 		tm.Add("lock", lockFn)
 	}
diff --git a/bt/terraform/init.go b/bt/terraform/init.go
index 109af9e..bc154cf 100644
--- a/bt/terraform/init.go
+++ b/bt/terraform/init.go
@@ -17,6 +17,7 @@ import (
 func initCMD(ctx context.Context, parent *getoptions.GetOpt) *getoptions.GetOpt {
 	opt := parent.NewCommand("init", "")
 	opt.Bool("dry-run", false)
+	opt.Bool("ignore-cache", false, opt.Description("Ignore the cache and re-run the init"), opt.Alias("ic"))
 	opt.SetCommandFn(initRun)
 	return opt
 }
@@ -25,12 +26,29 @@ func initRun(ctx context.Context, opt *getoptions.GetOpt, args []string) error {
 	dryRun := opt.Value("dry-run").(bool)
 	profile := opt.Value("profile").(string)
 	color := opt.Value("color").(string)
+	ignoreCache := opt.Value("ignore-cache").(bool)
 
 	cfg := config.ConfigFromContext(ctx)
 	dir := DirFromContext(ctx)
 	LogConfig(cfg, profile)
 	os.Setenv("CONFIG_ROOT", cfg.ConfigRoot)
 
+	lockFile := ".terraform.lock.hcl"
+	initFile := ".tf.init"
+	files, modified, err := fsmodtime.Target(os.DirFS(dir), []string{initFile}, []string{lockFile})
+	if err != nil {
+		Logger.Printf("failed to check changes for: '%s'\n", lockFile)
+	}
+	if !ignoreCache && !modified {
+		Logger.Printf("no changes: skipping init\n")
+		return nil
+	}
+	if len(files) > 0 {
+		Logger.Printf("modified: %v\n", files)
+	} else {
+		Logger.Printf("missing target: %v\n", initFile)
+	}
+
 	cmd := []string{cfg.TFProfile[cfg.Profile(profile)].BinaryName, "init"}
 
 	for _, bvars := range cfg.TFProfile[cfg.Profile(profile)].Init.BackendConfig {
@@ -50,7 +68,7 @@ func initRun(ctx context.Context, opt *getoptions.GetOpt, args []string) error {
 	cmd = append(cmd, args...)
 	dataDir := fmt.Sprintf("TF_DATA_DIR=%s", getDataDir(cfg.Config.DefaultTerraformProfile, cfg.Profile(profile)))
 	Logger.Printf("export %s\n", dataDir)
-	err := run.CMDCtx(ctx, cmd...).Stdin().Log().Env(dataDir).Dir(dir).DryRun(dryRun).Run()
+	err = run.CMDCtx(ctx, cmd...).Stdin().Log().Env(dataDir).Dir(dir).DryRun(dryRun).Run()
 	if err != nil {
 		os.Remove(filepath.Join(dir, ".tf.lock"))
 		return fmt.Errorf("failed to run: %w", err)
@@ -61,13 +79,13 @@ func initRun(ctx context.Context, opt *getoptions.GetOpt, args []string) error {
 	}
 
 	os.Remove(filepath.Join(dir, ".tf.lock"))
-	initFile := filepath.Join(dir, ".tf.init")
-	fh, err := os.Create(initFile)
+	initFilePath := filepath.Join(dir, initFile)
+	fh, err := os.Create(initFilePath)
 	if err != nil {
 		return fmt.Errorf("failed to create file: %w", err)
 	}
 	fh.Close()
-	Logger.Printf("Create %s\n", initFile)
+	Logger.Printf("Create %s\n", initFilePath)
 
 	return nil
 }
diff --git a/bt/terraform/init_test.go b/bt/terraform/init_test.go
index 83bb14f..eb1a4e7 100644
--- a/bt/terraform/init_test.go
+++ b/bt/terraform/init_test.go
@@ -45,6 +45,7 @@ func TestInit(t *testing.T) {
 		ctx = run.ContextWithRunInfo(ctx, mock)
 		opt := getoptions.New()
 		opt.Bool("dry-run", false)
+		opt.Bool("ignore-cache", false)
 		opt.String("profile", "default")
 		opt.String("color", "auto")
 		err := initRun(ctx, opt, []string{})
@@ -82,6 +83,7 @@ func TestInit(t *testing.T) {
 		ctx = run.ContextWithRunInfo(ctx, mock)
 		opt := getoptions.New()
 		opt.Bool("dry-run", false)
+		opt.Bool("ignore-cache", false)
 		opt.String("profile", "default")
 		opt.String("color", "auto")
 		err := initRun(ctx, opt, []string{})
@@ -121,6 +123,7 @@ func TestInit(t *testing.T) {
 		ctx = run.ContextWithRunInfo(ctx, mock)
 		opt := getoptions.New()
 		opt.Bool("dry-run", false)
+		opt.Bool("ignore-cache", false)
 		opt.String("profile", "dev")
 		opt.String("color", "auto")
 		err := initRun(ctx, opt, []string{})
@@ -159,6 +162,7 @@ func TestInit(t *testing.T) {
 		ctx = run.ContextWithRunInfo(ctx, mock)
 		opt := getoptions.New()
 		opt.Bool("dry-run", false)
+		opt.Bool("ignore-cache", false)
 		opt.String("profile", "prod")
 		opt.String("color", "auto")
 		err := initRun(ctx, opt, []string{})