diff --git a/Makefile b/Makefile
index 890ac7ce..b6ba5c36 100644
--- a/Makefile
+++ b/Makefile
@@ -37,3 +37,17 @@ checks:
 
 fmt:
 	gofmt -s -l -w $(SRCS)
+
+# Release helper
+
+patch:
+	go run internal/release.go release -m patch
+
+minor:
+	go run internal/release.go release -m minor
+
+major:
+	go run internal/release.go release -m major
+
+detach:
+	go run internal/release.go detach
diff --git a/acme/api/internal/sender/useragent.go b/acme/api/internal/sender/useragent.go
index d2417b23..4b129b6a 100644
--- a/acme/api/internal/sender/useragent.go
+++ b/acme/api/internal/sender/useragent.go
@@ -1,8 +1,11 @@
 package sender
 
+// CODE GENERATED AUTOMATICALLY
+// THIS FILE MUST NOT BE EDITED BY HAND
+
 const (
 	// ourUserAgent is the User-Agent of this underlying library package.
-	ourUserAgent = "xenolf-acme"
+	ourUserAgent = "xenolf-acme/1.2.1"
 
 	// ourUserAgentComment is part of the UA comment linked to the version status of this underlying library package.
 	// values: detach|release
diff --git a/internal/release.go b/internal/release.go
new file mode 100644
index 00000000..b005e15f
--- /dev/null
+++ b/internal/release.go
@@ -0,0 +1,223 @@
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"go/ast"
+	"go/format"
+	"go/parser"
+	"go/token"
+	"io/ioutil"
+	"log"
+	"os"
+	"regexp"
+	"strconv"
+	"strings"
+	"text/template"
+
+	"github.com/urfave/cli"
+)
+
+const sourceFile = "./acme/api/internal/sender/useragent.go"
+
+const uaTemplate = `package sender
+
+// CODE GENERATED AUTOMATICALLY
+// THIS FILE MUST NOT BE EDITED BY HAND
+
+const (
+	// ourUserAgent is the User-Agent of this underlying library package.
+	ourUserAgent = "xenolf-acme/{{ .version }}"
+
+	// ourUserAgentComment is part of the UA comment linked to the version status of this underlying library package.
+	// values: detach|release
+	// NOTE: Update this with each tagged release.
+	ourUserAgentComment = "{{ .comment }}"
+)
+
+`
+
+func main() {
+	app := cli.NewApp()
+	app.Name = "lego-releaser"
+	app.Usage = "Lego releaser"
+	app.HelpName = "releaser"
+	app.Commands = []cli.Command{
+		{
+			Name:   "release",
+			Usage:  "Update file for a release",
+			Action: release,
+			Before: func(ctx *cli.Context) error {
+				mode := ctx.String("mode")
+				switch mode {
+				case "patch", "minor", "major":
+					return nil
+				default:
+					return fmt.Errorf("invalid mode: %s", mode)
+				}
+			},
+			Flags: []cli.Flag{
+				cli.StringFlag{
+					Name:  "mode, m",
+					Value: "patch",
+					Usage: "The release mode: patch|minor|major",
+				},
+			},
+		},
+		{
+			Name:   "detach",
+			Usage:  "Update file post release",
+			Action: detach,
+		},
+	}
+
+	err := app.Run(os.Args)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
+
+func release(ctx *cli.Context) error {
+	mode := ctx.String("mode")
+
+	// Read file
+	data, err := readUserAgentFile(sourceFile)
+	if err != nil {
+		return err
+	}
+
+	// Bump version
+	newVersion, err := bumpVersion(data["ourUserAgent"], mode)
+	if err != nil {
+		return err
+	}
+
+	// Write file
+	comment := "release" // detach|release
+	return writeUserAgentFile(sourceFile, newVersion, comment)
+}
+
+func detach(_ *cli.Context) error {
+	// Read file
+	data, err := readUserAgentFile(sourceFile)
+	if err != nil {
+		return err
+	}
+
+	// Write file
+	version := strings.TrimPrefix(data["ourUserAgent"], "xenolf-acme/")
+	comment := "detach"
+	return writeUserAgentFile(sourceFile, version, comment)
+}
+
+type visitor struct {
+	data map[string]string
+}
+
+func (v visitor) Visit(n ast.Node) ast.Visitor {
+	if n == nil {
+		return nil
+	}
+
+	switch d := n.(type) {
+	case *ast.GenDecl:
+		if d.Tok == token.CONST {
+			for _, spec := range d.Specs {
+				valueSpec, ok := spec.(*ast.ValueSpec)
+				if !ok {
+					continue
+				}
+				if len(valueSpec.Names) != 1 || len(valueSpec.Values) != 1 {
+					continue
+				}
+
+				va, ok := valueSpec.Values[0].(*ast.BasicLit)
+				if !ok {
+					continue
+				}
+				if va.Kind != token.STRING {
+					continue
+				}
+
+				s, err := strconv.Unquote(va.Value)
+				if err != nil {
+					continue
+				}
+
+				v.data[valueSpec.Names[0].String()] = s
+			}
+		}
+	default:
+		// noop
+	}
+	return v
+}
+
+func readUserAgentFile(filename string) (map[string]string, error) {
+	fset := token.NewFileSet()
+	file, err := parser.ParseFile(fset, filename, nil, parser.AllErrors)
+	if err != nil {
+		return nil, err
+	}
+
+	v := visitor{data: make(map[string]string)}
+	ast.Walk(v, file)
+
+	return v.data, nil
+}
+
+func writeUserAgentFile(filename string, version string, comment string) error {
+	tmpl, err := template.New("ua").Parse(uaTemplate)
+	if err != nil {
+		return err
+	}
+
+	b := &bytes.Buffer{}
+	err = tmpl.Execute(b, map[string]string{
+		"version": version,
+		"comment": comment,
+	})
+	if err != nil {
+		return err
+	}
+
+	source, err := format.Source(b.Bytes())
+	if err != nil {
+		return err
+	}
+
+	return ioutil.WriteFile(filename, source, 0644)
+}
+
+func bumpVersion(userAgent string, mode string) (string, error) {
+	prevVersion := strings.TrimPrefix(userAgent, "xenolf-acme/")
+
+	allString := regexp.MustCompile(`(\d+)\.(\d+)\.(\d+)`).FindStringSubmatch(prevVersion)
+
+	if len(allString) != 4 {
+		return "", fmt.Errorf("invalid version format: %s", prevVersion)
+	}
+
+	switch mode {
+	case "patch":
+		patch, err := strconv.Atoi(allString[3])
+		if err != nil {
+			return "", err
+		}
+		return fmt.Sprintf("%s.%s.%d", allString[1], allString[2], patch+1), nil
+	case "minor":
+		minor, err := strconv.Atoi(allString[2])
+		if err != nil {
+			return "", err
+		}
+		return fmt.Sprintf("%s.%d.0", allString[1], minor+1), nil
+	case "major":
+		major, err := strconv.Atoi(allString[1])
+		if err != nil {
+			return "", err
+		}
+		return fmt.Sprintf("%d.0.0", major+1), nil
+	default:
+		return "", fmt.Errorf("invalid mode: %s", mode)
+	}
+}