diff --git a/internal/vcs/copyfs_test.go b/internal/vcs/copyfs_test.go
deleted file mode 100644
index 6649a7d41..000000000
--- a/internal/vcs/copyfs_test.go
+++ /dev/null
@@ -1,75 +0,0 @@
-// Copyright 2023 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package vcs
-
-import (
-	"io"
-	"io/fs"
-	"os"
-	"path/filepath"
-)
-
-// copyFS is copied from Go tip as of 315b6ae682a2a4e7718924a45b8b311a0fe10043.
-// It's slightly adapted to avoid localizing names,
-// because that relies on Go internal functions and we don't need
-// to be that careful for this use case.
-// TODO use [os.CopyFS] when we can.
-
-// copyFS copies the file system fsys into the directory dir,
-// creating dir if necessary.
-//
-// Newly created directories and files have their default modes
-// where any bits from the file in fsys that are not part of the
-// standard read, write, and execute permissions will be zeroed
-// out, and standard read and write permissions are set for owner,
-// group, and others while retaining any existing execute bits from
-// the file in fsys.
-//
-// Symbolic links in fsys are not supported, a *PathError with Err set
-// to ErrInvalid is returned on symlink.
-//
-// Copying stops at and returns the first error encountered.
-func copyFS(dir string, fsys fs.FS) error {
-	return fs.WalkDir(fsys, ".", func(path string, d fs.DirEntry, err error) error {
-		if err != nil {
-			return err
-		}
-
-		// The original version calls safefilepath.Localize here
-		// but we don't have access to that and the context is
-		// limited enough that it shouldn't matter.
-		newPath := filepath.Join(dir, path)
-		if d.IsDir() {
-			return os.MkdirAll(newPath, 0777)
-		}
-
-		// TODO(panjf2000): handle symlinks with the help of fs.ReadLinkFS
-		// 		once https://go.dev/issue/49580 is done.
-		//		we also need safefilepath.IsLocal from https://go.dev/cl/564295.
-		if !d.Type().IsRegular() {
-			return &os.PathError{Op: "CopyFS", Path: path, Err: os.ErrInvalid}
-		}
-
-		r, err := fsys.Open(path)
-		if err != nil {
-			return err
-		}
-		defer r.Close()
-		info, err := r.Stat()
-		if err != nil {
-			return err
-		}
-		w, err := os.OpenFile(newPath, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0666|info.Mode()&0777)
-		if err != nil {
-			return err
-		}
-
-		if _, err := io.Copy(w, r); err != nil {
-			w.Close()
-			return &os.PathError{Op: "Copy", Path: newPath, Err: err}
-		}
-		return w.Close()
-	})
-}
diff --git a/internal/vcs/vcs_test.go b/internal/vcs/vcs_test.go
index 5fa2ce42f..59696b1c3 100644
--- a/internal/vcs/vcs_test.go
+++ b/internal/vcs/vcs_test.go
@@ -38,7 +38,7 @@ func TestGit(t *testing.T) {
 -- baz/something --
 `)))
 	qt.Assert(t, qt.IsNil(err))
-	err = copyFS(dir, testFS)
+	err = os.CopyFS(dir, testFS)
 	qt.Assert(t, qt.IsNil(err))
 
 	// In the tests that follow, we are testing the scenario where a module is