diff --git a/cmd/oras/attach.go b/cmd/oras/attach.go
index ba26e793e..def456817 100644
--- a/cmd/oras/attach.go
+++ b/cmd/oras/attach.go
@@ -27,6 +27,7 @@ import (
 	"oras.land/oras-go/v2/content"
 	"oras.land/oras-go/v2/content/file"
 	"oras.land/oras/cmd/oras/internal/display"
+	"oras.land/oras/cmd/oras/internal/errors"
 	"oras.land/oras/cmd/oras/internal/option"
 )
 
@@ -90,7 +91,7 @@ func runAttach(opts attachOptions) error {
 		return err
 	}
 	if dst.Reference.Reference == "" {
-		return newErrInvalidReference(dst.Reference)
+		return errors.NewErrInvalidReference(dst.Reference)
 	}
 	ociSubject, err := dst.Resolve(ctx, dst.Reference.Reference)
 	if err != nil {
diff --git a/cmd/oras/copy.go b/cmd/oras/copy.go
index 1cb4ba9a7..017197475 100644
--- a/cmd/oras/copy.go
+++ b/cmd/oras/copy.go
@@ -24,6 +24,7 @@ import (
 	"github.com/spf13/cobra"
 	"oras.land/oras-go/v2"
 	"oras.land/oras/cmd/oras/internal/display"
+	"oras.land/oras/cmd/oras/internal/errors"
 	"oras.land/oras/cmd/oras/internal/option"
 )
 
@@ -101,7 +102,7 @@ func runCopy(opts copyOptions) error {
 	}
 
 	if src.Reference.Reference == "" {
-		return newErrInvalidReference(src.Reference)
+		return errors.NewErrInvalidReference(src.Reference)
 	}
 
 	var desc ocispec.Descriptor
diff --git a/cmd/oras/discover.go b/cmd/oras/discover.go
index 7942568aa..51cb04839 100644
--- a/cmd/oras/discover.go
+++ b/cmd/oras/discover.go
@@ -30,6 +30,7 @@ import (
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
 	artifactspec "github.com/oras-project/artifacts-spec/specs-go/v1"
 	"github.com/spf13/cobra"
+	"oras.land/oras/cmd/oras/internal/errors"
 )
 
 type discoverOptions struct {
@@ -79,7 +80,7 @@ func runDiscover(opts discoverOptions) error {
 		return err
 	}
 	if repo.Reference.Reference == "" {
-		return newErrInvalidReference(repo.Reference)
+		return errors.NewErrInvalidReference(repo.Reference)
 	}
 
 	// discover artifacts
diff --git a/cmd/oras/errors.go b/cmd/oras/internal/errors/errors.go
similarity index 82%
rename from cmd/oras/errors.go
rename to cmd/oras/internal/errors/errors.go
index 9e6e883be..bbd43483d 100644
--- a/cmd/oras/errors.go
+++ b/cmd/oras/internal/errors/errors.go
@@ -13,7 +13,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package main
+package errors
 
 import (
 	"fmt"
@@ -21,7 +21,7 @@ import (
 	"oras.land/oras-go/v2/registry"
 )
 
-// newErrInvalidReference creates a new error based on the reference string.
-func newErrInvalidReference(ref registry.Reference) error {
+// NewErrInvalidReference  creates a new error based on the reference string.
+func NewErrInvalidReference(ref registry.Reference) error {
 	return fmt.Errorf("%s: invalid image reference, expecting <name:tag|name@digest>", ref)
 }
diff --git a/cmd/oras/pull.go b/cmd/oras/pull.go
index b7086260c..e7dcf96e0 100644
--- a/cmd/oras/pull.go
+++ b/cmd/oras/pull.go
@@ -27,6 +27,7 @@ import (
 	"oras.land/oras-go/v2/content/file"
 	"oras.land/oras-go/v2/content/oci"
 	"oras.land/oras/cmd/oras/internal/display"
+	"oras.land/oras/cmd/oras/internal/errors"
 	"oras.land/oras/cmd/oras/internal/option"
 	"oras.land/oras/internal/cache"
 )
@@ -88,7 +89,7 @@ func runPull(opts pullOptions) error {
 		return err
 	}
 	if repo.Reference.Reference == "" {
-		return newErrInvalidReference(repo.Reference)
+		return errors.NewErrInvalidReference(repo.Reference)
 	}
 	var src oras.Target = repo
 	if opts.cacheRoot != "" {
diff --git a/go.mod b/go.mod
index 0926d1d6c..2fdf70108 100644
--- a/go.mod
+++ b/go.mod
@@ -12,7 +12,7 @@ require (
 	github.com/sirupsen/logrus v1.9.0
 	github.com/spf13/cobra v1.5.0
 	github.com/spf13/pflag v1.0.5
-	oras.land/oras-go/v2 v2.0.0-20220804053649-e135557babfa
+	oras.land/oras-go/v2 v2.0.0-rc.2
 )
 
 require (
diff --git a/go.sum b/go.sum
index e031b6091..80645092c 100644
--- a/go.sum
+++ b/go.sum
@@ -67,5 +67,5 @@ gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gotest.tools/v3 v3.0.2 h1:kG1BFyqVHuQoVQiR1bWGnfz/fmHvvuiSPIV7rvl360E=
 gotest.tools/v3 v3.0.2/go.mod h1:3SzNCllyD9/Y+b5r9JIKQ474KzkZyqLqEfYqMsX94Bk=
-oras.land/oras-go/v2 v2.0.0-20220804053649-e135557babfa h1:/K4LND5cuAwZTGZ793qPQOppK8+vNX1JvSFNIEcUDKM=
-oras.land/oras-go/v2 v2.0.0-20220804053649-e135557babfa/go.mod h1:IZRIoIJqkAH6x0pL3tVnpyPUyZgthjSyPcH2kgJvBMo=
+oras.land/oras-go/v2 v2.0.0-rc.2 h1:dks9BxPg6HQOxn5+jVNuTFl45FuYvHfLQ6wcP7hVRdE=
+oras.land/oras-go/v2 v2.0.0-rc.2/go.mod h1:IZRIoIJqkAH6x0pL3tVnpyPUyZgthjSyPcH2kgJvBMo=