diff --git a/pkg/cmd/attestation/api/client_test.go b/pkg/cmd/attestation/api/client_test.go
index 7044a1cc5..693e3266e 100644
--- a/pkg/cmd/attestation/api/client_test.go
+++ b/pkg/cmd/attestation/api/client_test.go
@@ -62,14 +62,14 @@ func TestGetByDigest(t *testing.T) {
 
 	require.Equal(t, 5, len(attestations))
 	bundle := (attestations)[0].Bundle
-	require.Equal(t, bundle.GetMediaType(), "application/vnd.dev.sigstore.bundle+json;version=0.1")
+	require.Equal(t, bundle.GetMediaType(), "application/vnd.dev.sigstore.bundle.v0.3+json")
 
 	attestations, err = c.GetByOwnerAndDigest(testOwner, testDigest, DefaultLimit)
 	require.NoError(t, err)
 
 	require.Equal(t, 5, len(attestations))
 	bundle = (attestations)[0].Bundle
-	require.Equal(t, bundle.GetMediaType(), "application/vnd.dev.sigstore.bundle+json;version=0.1")
+	require.Equal(t, bundle.GetMediaType(), "application/vnd.dev.sigstore.bundle.v0.3+json")
 }
 
 func TestGetByDigestGreaterThanLimit(t *testing.T) {
@@ -82,14 +82,14 @@ func TestGetByDigestGreaterThanLimit(t *testing.T) {
 
 	require.Equal(t, 3, len(attestations))
 	bundle := (attestations)[0].Bundle
-	require.Equal(t, bundle.GetMediaType(), "application/vnd.dev.sigstore.bundle+json;version=0.1")
+	require.Equal(t, bundle.GetMediaType(), "application/vnd.dev.sigstore.bundle.v0.3+json")
 
 	attestations, err = c.GetByOwnerAndDigest(testOwner, testDigest, limit)
 	require.NoError(t, err)
 
 	require.Equal(t, len(attestations), limit)
 	bundle = (attestations)[0].Bundle
-	require.Equal(t, bundle.GetMediaType(), "application/vnd.dev.sigstore.bundle+json;version=0.1")
+	require.Equal(t, bundle.GetMediaType(), "application/vnd.dev.sigstore.bundle.v0.3+json")
 }
 
 func TestGetByDigestWithNextPage(t *testing.T) {
@@ -99,14 +99,14 @@ func TestGetByDigestWithNextPage(t *testing.T) {
 
 	require.Equal(t, len(attestations), 10)
 	bundle := (attestations)[0].Bundle
-	require.Equal(t, bundle.GetMediaType(), "application/vnd.dev.sigstore.bundle+json;version=0.1")
+	require.Equal(t, bundle.GetMediaType(), "application/vnd.dev.sigstore.bundle.v0.3+json")
 
 	attestations, err = c.GetByOwnerAndDigest(testOwner, testDigest, DefaultLimit)
 	require.NoError(t, err)
 
 	require.Equal(t, len(attestations), 10)
 	bundle = (attestations)[0].Bundle
-	require.Equal(t, bundle.GetMediaType(), "application/vnd.dev.sigstore.bundle+json;version=0.1")
+	require.Equal(t, bundle.GetMediaType(), "application/vnd.dev.sigstore.bundle.v0.3+json")
 }
 
 func TestGetByDigestGreaterThanLimitWithNextPage(t *testing.T) {
@@ -119,14 +119,14 @@ func TestGetByDigestGreaterThanLimitWithNextPage(t *testing.T) {
 
 	require.Equal(t, len(attestations), limit)
 	bundle := (attestations)[0].Bundle
-	require.Equal(t, bundle.GetMediaType(), "application/vnd.dev.sigstore.bundle+json;version=0.1")
+	require.Equal(t, bundle.GetMediaType(), "application/vnd.dev.sigstore.bundle.v0.3+json")
 
 	attestations, err = c.GetByOwnerAndDigest(testOwner, testDigest, limit)
 	require.NoError(t, err)
 
 	require.Equal(t, len(attestations), limit)
 	bundle = (attestations)[0].Bundle
-	require.Equal(t, bundle.GetMediaType(), "application/vnd.dev.sigstore.bundle+json;version=0.1")
+	require.Equal(t, bundle.GetMediaType(), "application/vnd.dev.sigstore.bundle.v0.3+json")
 }
 
 func TestGetByDigest_NoAttestationsFound(t *testing.T) {