diff --git a/selfupdate/detect.go b/selfupdate/detect.go
index b302eaf..b625aa6 100644
--- a/selfupdate/detect.go
+++ b/selfupdate/detect.go
@@ -92,10 +92,13 @@ func (up *Updater) DetectLatest(slug string) (release *Release, found bool, err
 	release = &Release{
 		AssetURL:      url,
 		AssetByteSize: asset.GetSize(),
+		AssetID:       asset.GetID(),
 		URL:           rel.GetHTMLURL(),
 		ReleaseNotes:  rel.GetBody(),
 		Name:          rel.GetName(),
 		PublishedAt:   &publishedAt,
+		RepoOwner:     repo[0],
+		RepoName:      repo[1],
 	}
 
 	release.Version, err = semver.Make(tag)
diff --git a/selfupdate/detect_test.go b/selfupdate/detect_test.go
index e044382..38aef2c 100644
--- a/selfupdate/detect_test.go
+++ b/selfupdate/detect_test.go
@@ -36,9 +36,18 @@ func TestDetectReleaseWithVersionPrefix(t *testing.T) {
 	if r.AssetByteSize == 0 {
 		t.Error("Asset's size is unexpectedly zero")
 	}
+	if r.AssetID == 0 {
+		t.Error("Asset's ID is unexpectedly zero")
+	}
 	if r.PublishedAt.IsZero() {
 		t.Error("Release time is unexpectedly zero")
 	}
+	if r.RepoOwner != "rhysd" {
+		t.Error("Repo owner is not correct:", r.RepoOwner)
+	}
+	if r.RepoName != "github-clone-all" {
+		t.Error("Repo name was not properly detectd:", r.RepoName)
+	}
 }
 
 func TestDetectReleasesForVariousArchives(t *testing.T) {
@@ -82,9 +91,18 @@ func TestDetectReleasesForVariousArchives(t *testing.T) {
 			if r.AssetByteSize == 0 {
 				t.Error("Asset's size is unexpectedly zero")
 			}
+			if r.AssetID == 0 {
+				t.Error("Asset's ID is unexpectedly zero")
+			}
 			if r.PublishedAt.IsZero() {
 				t.Error("Release time is unexpectedly zero")
 			}
+			if r.RepoOwner != "rhysd-test" {
+				t.Error("Repo owner should be rhysd-test:", r.RepoOwner)
+			}
+			if !strings.HasPrefix(r.RepoName, "test-release-") {
+				t.Error("Repo name was not properly detectd:", r.RepoName)
+			}
 		})
 	}
 }
diff --git a/selfupdate/release.go b/selfupdate/release.go
index b8bcdff..7515250 100644
--- a/selfupdate/release.go
+++ b/selfupdate/release.go
@@ -13,6 +13,8 @@ type Release struct {
 	AssetURL string
 	// AssetSize represents the size of asset in bytes
 	AssetByteSize int
+	// AssetID is the ID of the asset on GitHub
+	AssetID int
 	// URL is a URL to release page for browsing
 	URL string
 	// ReleaseNotes is a release notes of the release
@@ -21,4 +23,8 @@ type Release struct {
 	Name string
 	// PublishedAt is the time when the release was published
 	PublishedAt *time.Time
+	// RepoOwner is the owner of the repository of the release
+	RepoOwner string
+	// RepoName is the name of the repository of the release
+	RepoName string
 }
diff --git a/selfupdate/update.go b/selfupdate/update.go
index 5814898..dfd2bc5 100644
--- a/selfupdate/update.go
+++ b/selfupdate/update.go
@@ -2,6 +2,7 @@ package selfupdate
 
 import (
 	"fmt"
+	"io"
 	"net/http"
 	"os"
 	"path/filepath"
@@ -12,10 +13,26 @@ import (
 	"github.com/inconshreveable/go-update"
 )
 
-// UpdateTo download an executable from assetURL and replace the current binary with the downloaded one. cmdPath is a file path to command executable.
-func (up *Updater) UpdateTo(assetURL, cmdPath string) error {
-	// TODO: Use GitHub API client to download assets
+func readAndUpdate(src io.ReadCloser, assetURL, cmdPath string) error {
+	defer src.Close()
 
+	_, cmd := filepath.Split(cmdPath)
+	asset, err := UncompressCommand(src, assetURL, cmd)
+	if err != nil {
+		return err
+	}
+
+	log.Println("Will update", cmdPath, "to the latest downloaded from", assetURL)
+	return update.Apply(asset, update.Options{
+		TargetPath: cmdPath,
+	})
+}
+
+// UpdateTo downloads an executable from assetURL and replace the current binary with the downloaded one.
+// This function is low-level API to update the binary. Because it does not use GitHub API and downloads asset directly from the URL via HTTP,
+// this function is not available to update a release for private repositories.
+// cmdPath is a file path to command executable.
+func UpdateTo(assetURL, cmdPath string) error {
 	res, err := http.Get(assetURL)
 	if err != nil {
 		return fmt.Errorf("Failed to download a release file from %s: %s", assetURL, err)
@@ -25,17 +42,22 @@ func (up *Updater) UpdateTo(assetURL, cmdPath string) error {
 		return fmt.Errorf("Failed to download a release file from %s", assetURL)
 	}
 
-	defer res.Body.Close()
-	_, cmd := filepath.Split(cmdPath)
-	asset, err := UncompressCommand(res.Body, assetURL, cmd)
+	return readAndUpdate(res.Body, assetURL, cmdPath)
+}
+
+// UpdateTo downloads an executable from GitHub Releases API and replace current binary with the downloaded one.
+// It downloads a release asset via GitHub Releases API so this function is available for update releases on private repository.
+// If a redirect occurs, it fallbacks into directly downloading from the redirect URL.
+func (up *Updater) UpdateTo(rel *Release, cmdPath string) error {
+	src, redirectURL, err := up.api.Repositories.DownloadReleaseAsset(up.apiCtx, rel.RepoOwner, rel.RepoName, rel.AssetID)
 	if err != nil {
 		return err
 	}
-
-	log.Println("Will update", cmdPath, "to the latest downloaded from", assetURL)
-	return update.Apply(asset, update.Options{
-		TargetPath: cmdPath,
-	})
+	if redirectURL != "" {
+		log.Println("Redirect URL was returned while trying to download a release asset from GitHub API. Falling back to downloading from asset URL directly:", redirectURL)
+		return UpdateTo(redirectURL, cmdPath)
+	}
+	return readAndUpdate(src, rel.AssetURL, cmdPath)
 }
 
 // UpdateCommand updates a given command binary to the latest version.
@@ -71,7 +93,7 @@ func (up *Updater) UpdateCommand(cmdPath string, current semver.Version, slug st
 		return rel, nil
 	}
 	log.Println("Will update", cmdPath, "to the latest version", rel.Version)
-	if err := up.UpdateTo(rel.AssetURL, cmdPath); err != nil {
+	if err := up.UpdateTo(rel, cmdPath); err != nil {
 		return nil, err
 	}
 	return rel, nil
diff --git a/selfupdate/update_test.go b/selfupdate/update_test.go
index a6a8b05..68b1326 100644
--- a/selfupdate/update_test.go
+++ b/selfupdate/update_test.go
@@ -237,7 +237,7 @@ func TestInvalidSlugForUpdate(t *testing.T) {
 }
 
 func TestInvalidAssetURL(t *testing.T) {
-	err := NewUpdater(Config{}).UpdateTo("https://github.com/rhysd/non-existing-repo/releases/download/v1.2.3/foo.zip", "foo")
+	err := UpdateTo("https://github.com/rhysd/non-existing-repo/releases/download/v1.2.3/foo.zip", "foo")
 	if err == nil {
 		t.Fatal("Error should occur for URL not found")
 	}
@@ -248,7 +248,7 @@ func TestInvalidAssetURL(t *testing.T) {
 
 func TestBrokenAsset(t *testing.T) {
 	asset := "https://github.com/rhysd-test/test-incorrect-release/releases/download/invalid/broken-zip.zip"
-	err := NewUpdater(Config{}).UpdateTo(asset, "foo")
+	err := UpdateTo(asset, "foo")
 	if err == nil {
 		t.Fatal("Error should occur for URL not found")
 	}