diff --git a/internal/osbuild/assembler.go b/internal/osbuild/assembler.go
index 44e8324c7..354766889 100644
--- a/internal/osbuild/assembler.go
+++ b/internal/osbuild/assembler.go
@@ -32,12 +32,14 @@ func (assembler *Assembler) UnmarshalJSON(data []byte) error {
 	}
 	var options AssemblerOptions
 	switch rawAssembler.Name {
-	case "org.osbuild.tar":
-		options = new(TarAssemblerOptions)
+	case "org.osbuild.ostree.commit":
+		options = new(OSTreeCommitAssemblerOptions)
 	case "org.osbuild.qemu":
 		options = new(QEMUAssemblerOptions)
 	case "org.osbuild.rawfs":
 		options = new(RawFSAssemblerOptions)
+	case "org.osbuild.tar":
+		options = new(TarAssemblerOptions)
 	default:
 		return errors.New("unexpected assembler name")
 	}
diff --git a/internal/osbuild/assembler_test.go b/internal/osbuild/assembler_test.go
index fd05ea10b..14f9d94c6 100644
--- a/internal/osbuild/assembler_test.go
+++ b/internal/osbuild/assembler_test.go
@@ -108,6 +108,19 @@ func TestAssembler_UnmarshalJSON(t *testing.T) {
 			},
 			data: []byte(`{"name":"org.osbuild.rawfs","options":{"filename":"filesystem.img","root_fs_uuid":"76a22bf4-f153-4541-b6c7-0332c0dfaeac","size":2147483648}}`),
 		},
+		{
+			name: "ostree commit assembler",
+			assembler: Assembler{
+				Name: "org.osbuild.ostree.commit",
+				Options: &OSTreeCommitAssemblerOptions{
+					Ref: "foo",
+					Tar: OSTreeCommitAssemblerTarOptions{
+						Filename: "foo.tar",
+					},
+				},
+			},
+			data: []byte(`{"name":"org.osbuild.ostree.commit","options":{"ref":"foo","tar":{"filename":"foo.tar"}}}`),
+		},
 	}
 
 	assert := assert.New(t)
diff --git a/internal/osbuild/ostree_commit_assembler.go b/internal/osbuild/ostree_commit_assembler.go
new file mode 100644
index 000000000..eabb28b45
--- /dev/null
+++ b/internal/osbuild/ostree_commit_assembler.go
@@ -0,0 +1,23 @@
+package osbuild
+
+// OSTreeCommitAssemblerOptions desrcibe how to assemble a tree into an OSTree commit.
+type OSTreeCommitAssemblerOptions struct {
+	Ref    string                          `json:"ref"`
+	Parent string                          `json:"parent,omitempty"`
+	Tar    OSTreeCommitAssemblerTarOptions `json:"tar"`
+}
+
+// OSTreeCommitAssemblerTarOptions desrcibes the output tarball
+type OSTreeCommitAssemblerTarOptions struct {
+	Filename string `json:"filename"`
+}
+
+func (OSTreeCommitAssemblerOptions) isAssemblerOptions() {}
+
+// NewOSTreeCommitAssembler creates a new OSTree Commit Assembler object.
+func NewOSTreeCommitAssembler(options *OSTreeCommitAssemblerOptions) *Assembler {
+	return &Assembler{
+		Name:    "org.osbuild.ostree.commit",
+		Options: options,
+	}
+}