diff --git a/alt/alt.go b/alt/alt.go
new file mode 100644
index 0000000..9417b62
--- /dev/null
+++ b/alt/alt.go
@@ -0,0 +1,152 @@
+package alt
+
+import (
+	"archive/zip"
+	"bytes"
+	"encoding/json"
+	"encoding/xml"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/cheggaaa/pb/v3"
+	"github.com/spf13/afero"
+	"golang.org/x/xerrors"
+
+	"github.com/aquasecurity/vuln-list-update/utils"
+)
+
+const (
+	altDir = "oval"
+
+	branchURL     = "https://rdb.altlinux.org/api/errata/export/oval/%s"
+	branchListURL = "https://rdb.altlinux.org/api/errata/export/oval/branches"
+
+	retry = 5
+)
+
+type Config struct {
+	VulnListDir   string
+	BranchURL     string
+	BranchListURL string
+	AppFs         afero.Fs
+	Retry         int
+}
+
+func NewConfig() Config {
+	return Config{
+		VulnListDir:   utils.VulnListDir(),
+		BranchURL:     branchURL,
+		BranchListURL: branchListURL,
+		AppFs:         afero.NewOsFs(),
+		Retry:         retry,
+	}
+}
+
+type BranchList struct {
+	Length   int
+	Branches []string
+}
+
+func (c Config) Update() error {
+	dirPath := filepath.Join(c.VulnListDir, altDir)
+	log.Printf("Remove ALT's OVAL directoty: %s", dirPath)
+	if err := os.RemoveAll(dirPath); err != nil {
+		return xerrors.Errorf("failed to remove ALT's OVAL directory: %w", err)
+	}
+
+	log.Println("Fetching ALT's OVAL branch list...")
+	branchList, err := c.fetchBranchList()
+	if err != nil {
+		return err
+	}
+
+	for _, branch := range branchList.Branches {
+		log.Printf("Fetching ALT's OVAL branch: %s", branch)
+		if err := c.updateOVAL(branch); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (c Config) fetchBranchList() (BranchList, error) {
+	resp, err := utils.FetchURL(c.BranchListURL, "", c.Retry)
+	if err != nil {
+		return BranchList{}, xerrors.Errorf("failed to get ALT's OVAL branch list: %w", err)
+	}
+
+	var branchList BranchList
+	if err := json.Unmarshal(resp, &branchList); err != nil {
+		return BranchList{}, xerrors.Errorf("failed to unmarshal branch list JSON response: %w", err)
+	}
+
+	return branchList, nil
+}
+
+func (c Config) updateOVAL(branch string) error {
+	ovalURL := fmt.Sprintf(c.BranchURL, branch)
+
+	resp, err := utils.FetchURL(ovalURL, "", c.Retry)
+	if err != nil {
+		return xerrors.Errorf("failed to get ALT's OVAL branch archive: %w", err)
+	}
+
+	reader, err := zip.NewReader(bytes.NewReader(resp), int64(len(resp)))
+	if err != nil {
+		return xerrors.Errorf("failed to init zip reader: %w", err)
+	}
+
+	pbar := pb.StartNew(len(reader.File))
+	for _, file := range reader.File {
+		var oval OVALDefinitions
+		rc, err := file.Open()
+		if err != nil {
+			return xerrors.Errorf("failed to open file: %w", err)
+		}
+		content, err := io.ReadAll(rc)
+		if err != nil {
+			rc.Close()
+			return xerrors.Errorf("failed to read file content: %w", err)
+		}
+
+		err = xml.Unmarshal(content, &oval)
+		if err != nil {
+			rc.Close()
+			return xerrors.Errorf("failed to unmarshal ALT's OVAL xml: %w", err)
+		}
+
+		ovalName := strings.TrimSuffix(file.Name, ".xml")
+		ovalPath := filepath.Join(c.VulnListDir, altDir, branch, ovalName)
+
+		if err := utils.WriteJSON(c.AppFs, ovalPath, "tests.json", oval.Tests); err != nil {
+			rc.Close()
+			return xerrors.Errorf("failed to write tests.json: %w", err)
+		}
+
+		if err := utils.WriteJSON(c.AppFs, ovalPath, "objects.json", oval.Objects); err != nil {
+			rc.Close()
+			return xerrors.Errorf("failed to write objects.json: %w", err)
+		}
+
+		if err = utils.WriteJSON(c.AppFs, ovalPath, "states.json", oval.States); err != nil {
+			rc.Close()
+			return xerrors.Errorf("failed to write states: %w", err)
+		}
+
+		if err = utils.WriteJSON(c.AppFs, ovalPath, "definitions.json", oval.Definitions); err != nil {
+			rc.Close()
+			return xerrors.Errorf("failed to write definitions: %w", err)
+		}
+
+		pbar.Increment()
+		rc.Close()
+	}
+
+	pbar.Finish()
+	return nil
+}
diff --git a/alt/alt_test.go b/alt/alt_test.go
new file mode 100644
index 0000000..976e26f
--- /dev/null
+++ b/alt/alt_test.go
@@ -0,0 +1,61 @@
+package alt
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/spf13/afero"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestConfig_Update(t *testing.T) {
+	testCases := []struct {
+		name      string
+		dir       string
+		wantFiles int
+		wantErr   string
+	}{
+		{
+			name: "happy path",
+			dir:  "testdata/happy",
+		},
+		{
+			name:    "404",
+			dir:     "testdata/missing-oval",
+			wantErr: "failed to get ALT's OVAL branch archive: failed to fetch URL: HTTP error. status code: 404, url:",
+		},
+		{
+			name:    "broken XML",
+			dir:     "testdata/broken",
+			wantErr: "failed to unmarshal ALT's OVAL xml: XML syntax error on line 4: element <cpe> closed by </cp>",
+		},
+	}
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			ts := httptest.NewServer(http.FileServer(http.Dir(tc.dir)))
+			defer ts.Close()
+
+			tmpDir := "/tmp" // It is a virtual filesystem of afero.
+			appFs := afero.NewMemMapFs()
+			c := Config{
+				VulnListDir:   tmpDir,
+				BranchURL:     ts.URL + "/%s/oval_definitions.zip",
+				BranchListURL: ts.URL + "/branches.json",
+				AppFs:         appFs,
+				Retry:         0,
+			}
+
+			err := c.Update()
+			if tc.wantErr != "" {
+				require.Error(t, err)
+				assert.Contains(t, err.Error(), tc.wantErr)
+				return
+			}
+
+			require.NoError(t, err, tc.name)
+			assert.NoError(t, err, tc.name)
+		})
+	}
+}
diff --git a/alt/testdata/broken/branches.json b/alt/testdata/broken/branches.json
new file mode 100644
index 0000000..3295ef8
--- /dev/null
+++ b/alt/testdata/broken/branches.json
@@ -0,0 +1 @@
+{"length": 3, "branches": ["p9", "p10", "c9f2"]}
diff --git a/alt/testdata/broken/p9/oval_definitions.zip b/alt/testdata/broken/p9/oval_definitions.zip
new file mode 100644
index 0000000..23cb86e
Binary files /dev/null and b/alt/testdata/broken/p9/oval_definitions.zip differ
diff --git a/alt/testdata/happy/branches.json b/alt/testdata/happy/branches.json
new file mode 100644
index 0000000..3295ef8
--- /dev/null
+++ b/alt/testdata/happy/branches.json
@@ -0,0 +1 @@
+{"length": 3, "branches": ["p9", "p10", "c9f2"]}
diff --git a/alt/testdata/happy/c9f2/oval_definitions.zip b/alt/testdata/happy/c9f2/oval_definitions.zip
new file mode 100644
index 0000000..f0c824e
Binary files /dev/null and b/alt/testdata/happy/c9f2/oval_definitions.zip differ
diff --git a/alt/testdata/happy/p10/oval_definitions.zip b/alt/testdata/happy/p10/oval_definitions.zip
new file mode 100644
index 0000000..45e3f88
Binary files /dev/null and b/alt/testdata/happy/p10/oval_definitions.zip differ
diff --git a/alt/testdata/happy/p9/oval_definitions.zip b/alt/testdata/happy/p9/oval_definitions.zip
new file mode 100644
index 0000000..5119955
Binary files /dev/null and b/alt/testdata/happy/p9/oval_definitions.zip differ
diff --git a/alt/testdata/missing-oval/branches.json b/alt/testdata/missing-oval/branches.json
new file mode 100644
index 0000000..3295ef8
--- /dev/null
+++ b/alt/testdata/missing-oval/branches.json
@@ -0,0 +1 @@
+{"length": 3, "branches": ["p9", "p10", "c9f2"]}
diff --git a/alt/types.go b/alt/types.go
new file mode 100644
index 0000000..d373dd2
--- /dev/null
+++ b/alt/types.go
@@ -0,0 +1,230 @@
+package alt
+
+import "encoding/xml"
+
+type OVALDefinitions struct {
+	XMLName   xml.Name  `xml:"oval_definitions"`
+	Generator Generator `xml:"generator"`
+
+	Definitions Definitions `xml:"definitions"`
+	Tests       Tests       `xml:"tests"`
+	Objects     Objects     `xml:"objects"`
+	States      States      `xml:"states"`
+}
+
+type Generator struct {
+	Timestamp     string `xml:"timestamp"`
+	ProductName   string `xml:"product_name"`
+	SchemaVersion string `xml:"schema_version"`
+}
+
+type Definitions struct {
+	Definition []Definition `xml:"definition" json:",omitempty"`
+}
+
+type Definition struct {
+	ID       string   `xml:"id,attr" json:",omitempty"`
+	Version  string   `xml:"version,attr" json:",omitempty"`
+	Class    string   `xml:"class,attr" json:",omitempty"`
+	Metadata Metadata `xml:"metadata" json:",omitempty"`
+	Criteria Criteria `xml:"criteria" json:",omitempty"`
+}
+
+type Metadata struct {
+	Title        string      `xml:"title" json:",omitempty"`
+	AffectedList []Affected  `xml:"affected" json:",omitempty"`
+	References   []Reference `xml:"reference" json:",omitempty"`
+	Description  string      `xml:"description" json:",omitempty"`
+	Advisory     Advisory    `xml:"advisory" json:",omitempty"`
+}
+
+type Affected struct {
+	Family    string   `xml:"family,attr" json:",omitempty"`
+	Platforms []string `xml:"platform" json:",omitempty"`
+	Products  []string `xml:"product" json:",omitempty"`
+}
+
+type Reference struct {
+	RefID  string `xml:"ref_id,attr" json:",omitempty"`
+	RefURL string `xml:"ref_url,attr" json:",omitempty"`
+	Source string `xml:"source,attr" json:",omitempty"`
+}
+
+type Advisory struct {
+	From         string       `xml:"from,attr" json:",omitempty"`
+	Severity     string       `xml:"severity" json:",omitempty"`
+	Rights       string       `xml:"rights" json:",omitempty"`
+	Issued       Issued       `xml:"issued" json:",omitempty"`
+	Updated      Updated      `xml:"updated" json:",omitempty"`
+	BDUs         []CVE        `xml:"bdu" json:""`
+	CVEs         []CVE        `xml:"cve" json:",omitempty"`
+	Bugzilla     []Bugzilla   `xml:"bugzilla" json:",omitempty"`
+	AffectedCPEs AffectedCPEs `xml:"affected_cpe_list" json:",omitempty"`
+}
+
+type Bugzilla struct {
+	ID   string `xml:"id,attr" json:",omitempty"`
+	Href string `xml:"href,attr" json:",omitempty"`
+	Data string `xml:",chardata" json:",omitempty"`
+}
+
+type Issued struct {
+	Date string `xml:"date,attr" json:",omitempty"`
+}
+
+type Updated struct {
+	Date string `xml:"date,attr" json:",omitempty"`
+}
+
+type CVE struct {
+	ID     string `xml:",chardata"  json:",omitempty"`
+	CVSS   string `xml:"cvss,attr" json:",omitempty"`
+	CVSS3  string `xml:"cvss3,attr" json:",omitempty"`
+	CWE    string `xml:"cwe,attr"   json:",omitempty"`
+	Href   string `xml:"href,attr"   json:",omitempty"`
+	Impact string `xml:"impact,attr" json:",omitempty"`
+	Public string `xml:"public,attr" json:",omitempty"`
+}
+
+type AffectedCPEs struct {
+	CPEs []string `xml:"cpe" json:",omitempty"`
+}
+
+type Criteria struct {
+	Operator   string      `xml:"operator,attr" json:",omitempty"`
+	Criterions []Criterion `xml:"criterion" json:",omitempty"`
+	Criterias  []Criteria  `xml:"criteria" json:",omitempty"`
+}
+
+type Criterion struct {
+	TestRef string `xml:"test_ref,attr" json:",omitempty"`
+	Comment string `xml:"comment,attr" json:",omitempty"`
+}
+
+type Tests struct {
+	TextFileContent54Tests []TextFileContent54Test `xml:"textfilecontent54_test" json:",omitempty"`
+	RPMInfoTests           []RPMInfoTest           `xml:"rpminfo_test" json:",omitempty"`
+}
+
+type TextFileContent54Test struct {
+	ID      string `xml:"id,attr" json:",omitempty"`
+	Version string `xml:"version,attr" json:",omitempty"`
+	Check   string `xml:"check,attr" json:",omitempty"`
+	Comment string `xml:"comment,attr" json:",omitempty"`
+	Object  Object `xml:"object" json:",omitempty"`
+	State   State  `xml:"state" json:",omitempty"`
+}
+
+type State struct {
+	StateRef string `xml:"state_ref,attr" json:",omitempty"`
+	Text     string `xml:"state" json:",omitempty"`
+}
+
+type Object struct {
+	ObjectRef string `xml:"object_ref,attr" json:",omitempty"`
+	Text      string `xml:"object" json:",omitempty"`
+}
+
+type RPMInfoTest struct {
+	ID      string `xml:"id,attr" json:",omitempty"`
+	Version string `xml:"version,attr" json:",omitempty"`
+	Check   string `xml:"check,attr" json:",omitempty"`
+	Comment string `xml:"comment,attr" json:",omitempty"`
+	Object  Object `xml:"object" json:",omitempty"`
+	State   State  `xml:"state" json:",omitempty"`
+}
+
+type RPMInfoObject struct {
+	ID      string `xml:"id,attr" json:",omitempty"`
+	Version string `xml:"version,attr" json:",omitempty"`
+	Comment string `xml:"comment,attr" json:",omitempty"`
+	Name    string `xml:"name" json:",omitempty"`
+}
+
+type RPMInfoState struct {
+	ID            string        `xml:"id,attr" json:",omitempty"`
+	Version       string        `xml:"version,attr" json:",omitempty"`
+	Comment       string        `xml:"comment,attr" json:",omitempty"`
+	Arch          Arch          `xml:"arch" json:",omitempty"`
+	EVR           EVR           `xml:"evr" json:",omitempty"`
+	Subexpression Subexpression `xml:"subexpression" json:",omitempty"`
+}
+
+type Arch struct {
+	Text      string `xml:",chardata" json:",omitempty"`
+	Datatype  string `xml:"datatype,attr" json:",omitempty"`
+	Operation string `xml:"operation,attr" json:",omitempty"`
+}
+
+type EVR struct {
+	Text      string `xml:",chardata" json:",omitempty"`
+	Datatype  string `xml:"datatype,attr" json:",omitempty"`
+	Operation string `xml:"operation,attr" json:",omitempty"`
+}
+
+type Subexpression struct {
+	Operation string `xml:"operation,attr" json:",omitempty"`
+	Text      string `xml:",chardata" json:",omitempty"`
+}
+
+type Objects struct {
+	TextFileContent54Objects []TextFileContent54Object `xml:"textfilecontent54_object" json:",omitempty"`
+	RPMInfoObjects           []RPMInfoObject           `xml:"rpminfo_object" json:",omitempty"`
+}
+
+type TextFileContent54Object struct {
+	ID       string   `xml:"id,attr" json:",omitempty"`
+	Version  string   `xml:"version,attr" json:",omitempty"`
+	Comment  string   `xml:"comment,attr" json:",omitempty"`
+	Path     Path     `xml:"path" json:",omitempty"`
+	Filepath Filepath `xml:"filepath" json:",omitempty"`
+	Pattern  Pattern  `xml:"pattern" json:",omitempty"`
+	Instance Instance `xml:"instance" json:",omitempty"`
+}
+
+type Path struct {
+	Datatype string `xml:"datatype,attr" json:",omitempty"`
+	Text     string `xml:",chardata" json:",omitempty"`
+}
+
+type Filepath struct {
+	Datatype string `xml:"datatype,attr" json:",omitempty"`
+	Text     string `xml:",chardata" json:",omitempty"`
+}
+
+type Pattern struct {
+	Datatype  string `xml:"datatype,attr" json:",omitempty"`
+	Operation string `xml:"operation,attr" json:",omitempty"`
+	Text      string `xml:",chardata" json:",omitempty"`
+}
+
+type Instance struct {
+	Datatype string `xml:"datatype,attr" json:",omitempty"`
+	Text     string `xml:",chardata" json:",omitempty"`
+}
+
+type Name struct {
+	Text      string `xml:",chardata" json:",omitempty"`
+	Operation string `xml:"operation,attr" json:",omitempty"`
+}
+
+type States struct {
+	TextFileContent54State []TextFileContent54State `xml:"textfilecontent54_state" json:",omitempty"`
+	RPMInfoStates          []RPMInfoState           `xml:"rpminfo_state" json:",omitempty"`
+}
+
+type Version struct {
+	Text      string `xml:",chardata" json:",omitempty"`
+	Operation string `xml:"operation,attr" json:",omitempty"`
+}
+
+type TextFileContent54State struct {
+	ID      string `xml:"id,attr" json:",omitempty"`
+	Version string `xml:"version,attr" json:",omitempty"`
+	Text    Text   `xml:"text" json:",omitempty"`
+}
+
+type Text struct {
+	Text      string `xml:",chardata" json:",omitempty"`
+	Operation string `xml:"operation,attr" json:",omitempty"`
+}
diff --git a/main.go b/main.go
index 9e8be68..0a3bb7a 100644
--- a/main.go
+++ b/main.go
@@ -13,6 +13,7 @@ import (
 	"github.com/aquasecurity/vuln-list-update/alma"
 	"github.com/aquasecurity/vuln-list-update/alpine"
 	alpineunfixed "github.com/aquasecurity/vuln-list-update/alpine-unfixed"
+	"github.com/aquasecurity/vuln-list-update/alt"
 	"github.com/aquasecurity/vuln-list-update/amazon"
 	arch_linux "github.com/aquasecurity/vuln-list-update/arch"
 	"github.com/aquasecurity/vuln-list-update/chainguard"
@@ -38,7 +39,7 @@ import (
 
 var (
 	target = flag.String("target", "", "update target (nvd, alpine, alpine-unfixed, redhat, redhat-oval, "+
-		"debian, ubuntu, amazon, oracle-oval, suse-cvrf, photon, arch-linux, ghsa, glad, cwe, osv, mariner, kevc, wolfi, chainguard, k8s)")
+		"debian, ubuntu, amazon, oracle-oval, suse-cvrf, photon, arch-linux, ghsa, glad, cwe, osv, mariner, kevc, wolfi, chainguard, k8s, alt)")
 	vulnListDir  = flag.String("vuln-list-dir", "", "vuln-list dir")
 	targetUri    = flag.String("target-uri", "", "alternative repository URI (only glad)")
 	targetBranch = flag.String("target-branch", "", "alternative repository branch (only glad)")
@@ -176,6 +177,11 @@ func run() error {
 		if err := ku.Update(); err != nil {
 			return xerrors.Errorf("k8s update error: %w", err)
 		}
+	case "alt":
+		alt := alt.NewConfig()
+		if err := alt.Update(); err != nil {
+			return xerrors.Errorf("ALT update error: %w", err)
+		}
 	default:
 		return xerrors.New("unknown target")
 	}