diff --git a/ports/capabilities.go b/ports/capabilities.go
new file mode 100644
index 0000000..4f3f628
--- /dev/null
+++ b/ports/capabilities.go
@@ -0,0 +1,60 @@
+package ports
+
+import (
+	"context"
+
+	"github.com/gogrlx/snack"
+)
+
+// Compile-time interface checks.
+var (
+	_ snack.VersionQuerier = (*Ports)(nil)
+	_ snack.Cleaner        = (*Ports)(nil)
+	_ snack.FileOwner      = (*Ports)(nil)
+)
+
+// LatestVersion returns the latest available version from configured repositories.
+func (p *Ports) LatestVersion(ctx context.Context, pkg string) (string, error) {
+	return latestVersion(ctx, pkg)
+}
+
+// ListUpgrades returns packages that have newer versions available.
+func (p *Ports) ListUpgrades(ctx context.Context) ([]snack.Package, error) {
+	return listUpgrades(ctx)
+}
+
+// UpgradeAvailable reports whether a newer version is available.
+func (p *Ports) UpgradeAvailable(ctx context.Context, pkg string) (bool, error) {
+	return upgradeAvailable(ctx, pkg)
+}
+
+// VersionCmp compares two version strings.
+// OpenBSD has no native version comparison tool, so this uses a simple
+// lexicographic comparison of the version strings.
+func (p *Ports) VersionCmp(ctx context.Context, ver1, ver2 string) (int, error) {
+	return versionCmp(ctx, ver1, ver2)
+}
+
+// Autoremove removes packages no longer required as dependencies.
+func (p *Ports) Autoremove(ctx context.Context, opts ...snack.Option) error {
+	p.Lock()
+	defer p.Unlock()
+	return autoremove(ctx, opts...)
+}
+
+// Clean removes cached package files.
+func (p *Ports) Clean(ctx context.Context) error {
+	p.Lock()
+	defer p.Unlock()
+	return clean(ctx)
+}
+
+// FileList returns all files installed by a package.
+func (p *Ports) FileList(ctx context.Context, pkg string) ([]string, error) {
+	return fileList(ctx, pkg)
+}
+
+// Owner returns the package that owns a given file path.
+func (p *Ports) Owner(ctx context.Context, path string) (string, error) {
+	return owner(ctx, path)
+}
diff --git a/ports/capabilities_openbsd.go b/ports/capabilities_openbsd.go
new file mode 100644
index 0000000..adef83d
--- /dev/null
+++ b/ports/capabilities_openbsd.go
@@ -0,0 +1,146 @@
+//go:build openbsd
+
+package ports
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"github.com/gogrlx/snack"
+)
+
+func latestVersion(ctx context.Context, pkg string) (string, error) {
+	// pkg_info -Q returns available packages matching the query.
+	out, err := runCmd(ctx, "pkg_info", []string{"-Q", pkg}, snack.Options{})
+	if err != nil {
+		if strings.Contains(err.Error(), "exit status 1") {
+			return "", fmt.Errorf("ports latestVersion %s: %w", pkg, snack.ErrNotFound)
+		}
+		return "", fmt.Errorf("ports latestVersion: %w", err)
+	}
+	// Find the best match: exact name match with highest version.
+	var best string
+	for _, line := range strings.Split(out, "\n") {
+		line = strings.TrimSpace(line)
+		if line == "" {
+			continue
+		}
+		name, ver := splitNameVersion(line)
+		if name == pkg && ver != "" {
+			if best == "" || ver > best {
+				best = ver
+			}
+		}
+	}
+	if best == "" {
+		return "", fmt.Errorf("ports latestVersion %s: %w", pkg, snack.ErrNotFound)
+	}
+	return best, nil
+}
+
+func listUpgrades(ctx context.Context) ([]snack.Package, error) {
+	// pkg_add -u -n simulates upgrading all packages.
+	out, err := runCmd(ctx, "pkg_add", []string{"-u", "-n"}, snack.Options{})
+	if err != nil {
+		// Exit status 1 with no output means nothing to upgrade.
+		if strings.Contains(err.Error(), "exit status 1") {
+			return nil, nil
+		}
+		return nil, fmt.Errorf("ports listUpgrades: %w", err)
+	}
+	return parseUpgradeOutput(out), nil
+}
+
+func upgradeAvailable(ctx context.Context, pkg string) (bool, error) {
+	upgrades, err := listUpgrades(ctx)
+	if err != nil {
+		return false, err
+	}
+	for _, u := range upgrades {
+		if u.Name == pkg {
+			return true, nil
+		}
+	}
+	return false, nil
+}
+
+func versionCmp(_ context.Context, ver1, ver2 string) (int, error) {
+	// OpenBSD has no native version comparison tool.
+	// Use simple string comparison.
+	switch {
+	case ver1 < ver2:
+		return -1, nil
+	case ver1 > ver2:
+		return 1, nil
+	default:
+		return 0, nil
+	}
+}
+
+func autoremove(ctx context.Context, opts ...snack.Option) error {
+	o := snack.ApplyOptions(opts...)
+	_, err := runCmd(ctx, "pkg_delete", []string{"-a"}, o)
+	return err
+}
+
+func clean(_ context.Context) error {
+	// OpenBSD does not maintain a package cache like FreeBSD/apt.
+	// Downloaded packages are removed after installation by default.
+	return nil
+}
+
+func fileList(ctx context.Context, pkg string) ([]string, error) {
+	out, err := runCmd(ctx, "pkg_info", []string{"-L", pkg}, snack.Options{})
+	if err != nil {
+		if strings.Contains(err.Error(), "exit status 1") {
+			return nil, fmt.Errorf("ports fileList %s: %w", pkg, snack.ErrNotInstalled)
+		}
+		return nil, fmt.Errorf("ports fileList: %w", err)
+	}
+	return parseFileListOutput(out), nil
+}
+
+func owner(ctx context.Context, path string) (string, error) {
+	out, err := runCmd(ctx, "pkg_info", []string{"-E", path}, snack.Options{})
+	if err != nil {
+		if strings.Contains(err.Error(), "exit status 1") {
+			return "", fmt.Errorf("ports owner %s: %w", path, snack.ErrNotFound)
+		}
+		return "", fmt.Errorf("ports owner: %w", err)
+	}
+	return parseOwnerOutput(out), nil
+}
+
+func upgradePackages(ctx context.Context, pkgs []snack.Target, opts ...snack.Option) (snack.InstallResult, error) {
+	o := snack.ApplyOptions(opts...)
+	var toUpgrade []snack.Target
+	var unchanged []string
+	for _, t := range pkgs {
+		if o.DryRun {
+			toUpgrade = append(toUpgrade, t)
+			continue
+		}
+		ok, err := isInstalled(ctx, t.Name)
+		if err != nil {
+			return snack.InstallResult{}, err
+		}
+		if !ok {
+			unchanged = append(unchanged, t.Name)
+		} else {
+			toUpgrade = append(toUpgrade, t)
+		}
+	}
+	if len(toUpgrade) > 0 {
+		args := append([]string{"-u"}, snack.TargetNames(toUpgrade)...)
+		if _, err := runCmd(ctx, "pkg_add", args, o); err != nil {
+			return snack.InstallResult{}, err
+		}
+	}
+	var upgraded []snack.Package
+	for _, t := range toUpgrade {
+		v, _ := version(ctx, t.Name)
+		upgraded = append(upgraded, snack.Package{Name: t.Name, Version: v, Installed: true})
+	}
+	return snack.InstallResult{Installed: upgraded, Unchanged: unchanged}, nil
+}
diff --git a/ports/capabilities_other.go b/ports/capabilities_other.go
new file mode 100644
index 0000000..5441940
--- /dev/null
+++ b/ports/capabilities_other.go
@@ -0,0 +1,45 @@
+//go:build !openbsd
+
+package ports
+
+import (
+	"context"
+
+	"github.com/gogrlx/snack"
+)
+
+func latestVersion(_ context.Context, _ string) (string, error) {
+	return "", snack.ErrUnsupportedPlatform
+}
+
+func listUpgrades(_ context.Context) ([]snack.Package, error) {
+	return nil, snack.ErrUnsupportedPlatform
+}
+
+func upgradeAvailable(_ context.Context, _ string) (bool, error) {
+	return false, snack.ErrUnsupportedPlatform
+}
+
+func versionCmp(_ context.Context, _, _ string) (int, error) {
+	return 0, snack.ErrUnsupportedPlatform
+}
+
+func autoremove(_ context.Context, _ ...snack.Option) error {
+	return snack.ErrUnsupportedPlatform
+}
+
+func clean(_ context.Context) error {
+	return snack.ErrUnsupportedPlatform
+}
+
+func fileList(_ context.Context, _ string) ([]string, error) {
+	return nil, snack.ErrUnsupportedPlatform
+}
+
+func owner(_ context.Context, _ string) (string, error) {
+	return "", snack.ErrUnsupportedPlatform
+}
+
+func upgradePackages(_ context.Context, _ []snack.Target, _ ...snack.Option) (snack.InstallResult, error) {
+	return snack.InstallResult{}, snack.ErrUnsupportedPlatform
+}
diff --git a/ports/parse.go b/ports/parse.go
index e568d79..a804eb0 100644
--- a/ports/parse.go
+++ b/ports/parse.go
@@ -105,6 +105,55 @@ func parseInfoOutput(output string, pkg string) *snack.Package {
 	return p
 }
 
+// parseUpgradeOutput parses the output of `pkg_add -u -n`.
+// Lines like "name-oldver -> name-newver" indicate available upgrades.
+func parseUpgradeOutput(output string) []snack.Package {
+	var pkgs []snack.Package
+	for _, line := range strings.Split(output, "\n") {
+		line = strings.TrimSpace(line)
+		if !strings.Contains(line, "->") {
+			continue
+		}
+		parts := strings.Fields(line)
+		// Expect: "name-oldver -> name-newver"
+		if len(parts) < 3 || parts[1] != "->" {
+			continue
+		}
+		name, _ := splitNameVersion(parts[0])
+		_, newVer := splitNameVersion(parts[2])
+		if name != "" {
+			pkgs = append(pkgs, snack.Package{
+				Name:      name,
+				Version:   newVer,
+				Installed: true,
+			})
+		}
+	}
+	return pkgs
+}
+
+// parseFileListOutput parses `pkg_info -L <pkg>` output.
+// Lines starting with "/" after the header are file paths.
+func parseFileListOutput(output string) []string {
+	var files []string
+	for _, line := range strings.Split(output, "\n") {
+		line = strings.TrimSpace(line)
+		if strings.HasPrefix(line, "/") {
+			files = append(files, line)
+		}
+	}
+	return files
+}
+
+// parseOwnerOutput parses `pkg_info -E <path>` output.
+// Returns the package name that owns the file.
+func parseOwnerOutput(output string) string {
+	output = strings.TrimSpace(output)
+	// pkg_info -E returns the package name-version
+	name, _ := splitNameVersion(output)
+	return name
+}
+
 // splitNameVersion splits "name-version" at the last hyphen.
 // OpenBSD packages use the last hyphen before a version number as separator.
 func splitNameVersion(s string) (string, string) {
diff --git a/ports/ports.go b/ports/ports.go
index 67446a6..f67a94c 100644
--- a/ports/ports.go
+++ b/ports/ports.go
@@ -83,3 +83,11 @@ func (p *Ports) Version(ctx context.Context, pkg string) (string, error) {
 
 // Verify interface compliance at compile time.
 var _ snack.Manager = (*Ports)(nil)
+var _ snack.PackageUpgrader = (*Ports)(nil)
+
+// UpgradePackages upgrades specific installed packages.
+func (p *Ports) UpgradePackages(ctx context.Context, pkgs []snack.Target, opts ...snack.Option) (snack.InstallResult, error) {
+	p.Lock()
+	defer p.Unlock()
+	return upgradePackages(ctx, pkgs, opts...)
+}
diff --git a/ports/ports_test.go b/ports/ports_test.go
index 6f2a91e..238c17c 100644
--- a/ports/ports_test.go
+++ b/ports/ports_test.go
@@ -176,8 +176,81 @@ func TestSplitNameVersionLeadingHyphen(t *testing.T) {
 	}
 }
 
+func TestParseUpgradeOutput(t *testing.T) {
+	input := `quirks-7.14 -> quirks-7.18
+curl-8.5.0 -> curl-8.6.0
+python-3.11.7p0 -> python-3.11.8p0
+`
+	pkgs := parseUpgradeOutput(input)
+	if len(pkgs) != 3 {
+		t.Fatalf("expected 3 packages, got %d", len(pkgs))
+	}
+	if pkgs[0].Name != "quirks" || pkgs[0].Version != "7.18" {
+		t.Errorf("unexpected first package: %+v", pkgs[0])
+	}
+	if pkgs[1].Name != "curl" || pkgs[1].Version != "8.6.0" {
+		t.Errorf("unexpected second package: %+v", pkgs[1])
+	}
+	if pkgs[2].Name != "python" || pkgs[2].Version != "3.11.8p0" {
+		t.Errorf("unexpected third package: %+v", pkgs[2])
+	}
+}
+
+func TestParseUpgradeOutputEmpty(t *testing.T) {
+	pkgs := parseUpgradeOutput("")
+	if len(pkgs) != 0 {
+		t.Fatalf("expected 0 packages, got %d", len(pkgs))
+	}
+}
+
+func TestParseFileListOutput(t *testing.T) {
+	input := `Information for curl-8.5.0:
+
+Files:
+/usr/local/bin/curl
+/usr/local/include/curl/curl.h
+/usr/local/lib/libcurl.so.26.0
+/usr/local/man/man1/curl.1
+`
+	files := parseFileListOutput(input)
+	if len(files) != 4 {
+		t.Fatalf("expected 4 files, got %d", len(files))
+	}
+	if files[0] != "/usr/local/bin/curl" {
+		t.Errorf("unexpected first file: %q", files[0])
+	}
+}
+
+func TestParseFileListOutputEmpty(t *testing.T) {
+	files := parseFileListOutput("")
+	if len(files) != 0 {
+		t.Fatalf("expected 0 files, got %d", len(files))
+	}
+}
+
+func TestParseOwnerOutput(t *testing.T) {
+	tests := []struct {
+		input string
+		want  string
+	}{
+		{"curl-8.5.0", "curl"},
+		{"python-3.11.7p0", "python"},
+		{"", ""},
+	}
+	for _, tt := range tests {
+		got := parseOwnerOutput(tt.input)
+		if got != tt.want {
+			t.Errorf("parseOwnerOutput(%q) = %q, want %q", tt.input, got, tt.want)
+		}
+	}
+}
+
 func TestInterfaceCompliance(t *testing.T) {
 	var _ snack.Manager = (*Ports)(nil)
+	var _ snack.VersionQuerier = (*Ports)(nil)
+	var _ snack.Cleaner = (*Ports)(nil)
+	var _ snack.FileOwner = (*Ports)(nil)
+	var _ snack.PackageUpgrader = (*Ports)(nil)
 }
 
 func TestName(t *testing.T) {