diff --git a/cmd/oras/root/push.go b/cmd/oras/root/push.go
index f053cec38..323468d39 100644
--- a/cmd/oras/root/push.go
+++ b/cmd/oras/root/push.go
@@ -197,7 +197,7 @@ func runPush(cmd *cobra.Command, opts *pushOptions) error {
 		if err != nil {
 			return err
 		}
-		mediaType := oras.MediaTypeUnknownConfig
+		mediaType := ocispec.MediaTypeImageConfig
 		if opts.Flag == option.ImageSpecV1_0 && opts.artifactType != "" {
 			mediaType = opts.artifactType
 		}
diff --git a/test/e2e/internal/testdata/foobar/const.go b/test/e2e/internal/testdata/foobar/const.go
index e4b39cfb2..70af1eb3d 100644
--- a/test/e2e/internal/testdata/foobar/const.go
+++ b/test/e2e/internal/testdata/foobar/const.go
@@ -41,7 +41,7 @@ var (
 	PlatformConfigSize     = 38
 	PlatformConfigDigest   = digest.Digest("sha256:e94c0ba80a1157ffab5b5c6656fffc089c6446c7ed0604f3382910d1ef7dd40d")
 	PlatformConfigStateKey = match.StateKey{
-		Digest: "e94c0ba80a11", Name: "application/vnd.unknown.config.v1+json",
+		Digest: "e94c0ba80a11", Name: "application/vnd.oci.image.config.v1+json",
 	}
 
 	PlatformV10ConfigSize     = 38
@@ -50,7 +50,7 @@ var (
 		Digest: "e94c0ba80a11", Name: "test/artifact+json",
 	}
 	PlatformV1DEfaultConfigStateKey = match.StateKey{
-		Digest: "e94c0ba80a11", Name: "application/vnd.unknown.config.v1+json",
+		Digest: "e94c0ba80a11", Name: "application/vnd.oci.image.config.v1+json",
 	}
 
 	FileBarName     = "foobar/bar"
diff --git a/test/e2e/suite/command/push.go b/test/e2e/suite/command/push.go
index cfba901bc..7dba0b3a2 100644
--- a/test/e2e/suite/command/push.go
+++ b/test/e2e/suite/command/push.go
@@ -674,7 +674,7 @@ var _ = Describe("OCI image layout users:", func() {
 			var manifest ocispec.Manifest
 			Expect(json.Unmarshal(fetched, &manifest)).ShouldNot(HaveOccurred())
 			Expect(manifest.Config).Should(Equal(ocispec.Descriptor{
-				MediaType: "application/vnd.unknown.config.v1+json",
+				MediaType: "application/vnd.oci.image.config.v1+json",
 				Size:      int64(foobar.PlatformV10ConfigSize),
 				Digest:    foobar.PlatformV10ConfigDigest,
 			}))