diff --git a/go.mod b/go.mod
index 6838c43..97f3f71 100644
--- a/go.mod
+++ b/go.mod
@@ -6,13 +6,13 @@ replace github.com/asaskevich/EventBus v0.0.0-20200330115301-33b3bc6a7ddc => git
 
 // Main dependencies
 require (
-	github.com/SermoDigital/jose v0.9.2-0.20161205224733-f6df55f235c2
 	github.com/asaskevich/EventBus v0.0.0-20200330115301-33b3bc6a7ddc
 	github.com/brunomvsouza/singleflight v0.4.0
 	github.com/defval/di v1.12.0
 	github.com/etherlabsio/healthcheck/v2 v2.0.0
 	github.com/getsentry/raven-go v0.2.1-0.20190419175539-919484f041ea
 	github.com/go-playground/validator/v10 v10.17.0
+	github.com/golang-jwt/jwt/v5 v5.2.0
 	github.com/gorilla/mux v1.8.1
 	github.com/jellydator/ttlcache/v3 v3.1.1
 	github.com/mediocregopher/radix/v4 v4.1.4
diff --git a/go.sum b/go.sum
index f03799a..3a1ef38 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,3 @@
-github.com/SermoDigital/jose v0.9.2-0.20161205224733-f6df55f235c2 h1:koK7z0nSsRiRiBWwa+E714Puh+DO+ZRdIyAXiXzL+lg=
-github.com/SermoDigital/jose v0.9.2-0.20161205224733-f6df55f235c2/go.mod h1:ARgCUhI1MHQH+ONky/PAtmVHQrP5JlGY0F3poXOp/fA=
 github.com/brunomvsouza/singleflight v0.4.0 h1:9dNcTeYoXSus3xbZEM0EEZ11EcCRjUZOvVW8rnDMG5Y=
 github.com/brunomvsouza/singleflight v0.4.0/go.mod h1:8RYo9j5WQRupmsnUz5DlUWZxDLNi+t9Zhj3EZFmns7I=
 github.com/certifi/gocertifi v0.0.0-20210507211836-431795d63e8d h1:S2NE3iHSwP0XV47EEXL8mWmRdEfGscSJ+7EgePNgt0s=
@@ -31,6 +29,8 @@ github.com/go-playground/universal-translator v0.18.1 h1:Bcnm0ZwsGyWbCzImXv+pAJn
 github.com/go-playground/universal-translator v0.18.1/go.mod h1:xekY+UJKNuX9WP91TpwSH2VMlDf28Uj24BCp08ZFTUY=
 github.com/go-playground/validator/v10 v10.17.0 h1:SmVVlfAOtlZncTxRuinDPomC2DkXJ4E5T9gDA0AIH74=
 github.com/go-playground/validator/v10 v10.17.0/go.mod h1:9iXMNT7sEkjXb0I+enO7QXmzG6QCsPWY4zveKFVRSyU=
+github.com/golang-jwt/jwt/v5 v5.2.0 h1:d/ix8ftRUorsN+5eMIlF4T6J8CAt9rch3My2winC1Jw=
+github.com/golang-jwt/jwt/v5 v5.2.0/go.mod h1:pqrtFR0X4osieyHYxtmOUWsAWrfe1Q5UVIyoH402zdk=
 github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
 github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/gorilla/mux v1.8.1 h1:TuBL49tXwgrFYWhqrNgrUNEY92u81SPhu7sTdzQEiWY=
diff --git a/internal/cmd/token.go b/internal/cmd/token.go
index 519e20b..df20ef3 100644
--- a/internal/cmd/token.go
+++ b/internal/cmd/token.go
@@ -2,9 +2,8 @@ package cmd
 
 import (
 	"fmt"
-	"log"
 
-	"ely.by/chrly/internal/http"
+	"ely.by/chrly/internal/security"
 
 	"github.com/spf13/cobra"
 )
@@ -12,20 +11,22 @@ import (
 var tokenCmd = &cobra.Command{
 	Use:   "token",
 	Short: "Creates a new token, which allows to interact with Chrly API",
-	Run: func(cmd *cobra.Command, args []string) {
+	RunE: func(cmd *cobra.Command, args []string) error {
 		container := shouldGetContainer()
-		var auth *http.JwtAuth
+		var auth *security.Jwt
 		err := container.Resolve(&auth)
 		if err != nil {
-			log.Fatal(err)
+			return err
 		}
 
-		token, err := auth.NewToken(http.SkinScope)
+		token, err := auth.NewToken(security.ProfileScope)
 		if err != nil {
-			log.Fatalf("Unable to create new token. The error is %v\n", err)
+			return fmt.Errorf("Unable to create a new token. The error is %v\n", err)
 		}
 
-		fmt.Printf("%s\n", token)
+		fmt.Println(token)
+
+		return nil
 	},
 }
 
diff --git a/internal/di/di.go b/internal/di/di.go
index a6c058c..4771b79 100644
--- a/internal/di/di.go
+++ b/internal/di/di.go
@@ -3,7 +3,7 @@ package di
 import "github.com/defval/di"
 
 func New() (*di.Container, error) {
-	container, err := di.New(
+	return di.New(
 		config,
 		dispatcher,
 		logger,
@@ -12,11 +12,6 @@ func New() (*di.Container, error) {
 		handlers,
 		profilesDi,
 		server,
-		signer,
+		securityDiOptions,
 	)
-	if err != nil {
-		return nil, err
-	}
-
-	return container, nil
 }
diff --git a/internal/di/signer.go b/internal/di/security.go
similarity index 56%
rename from internal/di/signer.go
rename to internal/di/security.go
index 2dfcc1a..bec4856 100644
--- a/internal/di/signer.go
+++ b/internal/di/security.go
@@ -1,29 +1,36 @@
 package di
 
 import (
+	"crypto/rand"
+	"crypto/rsa"
 	"crypto/x509"
 	"encoding/base64"
 	"encoding/pem"
-	"errors"
 	"strings"
 
 	"ely.by/chrly/internal/http"
-	. "ely.by/chrly/internal/signer"
+	"ely.by/chrly/internal/security"
 
 	"github.com/defval/di"
 	"github.com/spf13/viper"
 )
 
-var signer = di.Options(
+var securityDiOptions = di.Options(
 	di.Provide(newTexturesSigner,
 		di.As(new(http.TexturesSigner)),
 	),
 )
 
-func newTexturesSigner(config *viper.Viper) (*Signer, error) {
+func newTexturesSigner(config *viper.Viper) (*security.Signer, error) {
 	keyStr := config.GetString("chrly.signing.key")
 	if keyStr == "" {
-		return nil, errors.New("chrly.signing.key must be set in order to sign textures")
+		// TODO: log a message about the generated signing key and the way to specify it permanently
+		privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
+		if err != nil {
+			return nil, err
+		}
+
+		return security.NewSigner(privateKey), nil
 	}
 
 	var keyBytes []byte
@@ -40,10 +47,10 @@ func newTexturesSigner(config *viper.Viper) (*Signer, error) {
 	}
 
 	rawPem, _ := pem.Decode(keyBytes)
-	key, err := x509.ParsePKCS1PrivateKey(rawPem.Bytes)
+	privateKey, err := x509.ParsePKCS1PrivateKey(rawPem.Bytes)
 	if err != nil {
 		return nil, err
 	}
 
-	return &Signer{Key: key}, nil
+	return security.NewSigner(privateKey), nil
 }
diff --git a/internal/di/server.go b/internal/di/server.go
index 435c9d8..6fa8521 100644
--- a/internal/di/server.go
+++ b/internal/di/server.go
@@ -12,6 +12,7 @@ import (
 	"github.com/spf13/viper"
 
 	. "ely.by/chrly/internal/http"
+	"ely.by/chrly/internal/security"
 )
 
 var server = di.Options(
@@ -19,16 +20,13 @@ var server = di.Options(
 	di.Provide(newServer),
 )
 
-func newAuthenticator(config *viper.Viper, emitter Emitter) (*JwtAuth, error) {
+func newAuthenticator(config *viper.Viper) (*security.Jwt, error) {
 	key := config.GetString("chrly.secret")
 	if key == "" {
 		return nil, errors.New("chrly.secret must be set in order to use authenticator")
 	}
 
-	return &JwtAuth{
-		Key:     []byte(key),
-		Emitter: emitter,
-	}, nil
+	return security.NewJwt([]byte(key)), nil
 }
 
 type serverParams struct {
diff --git a/internal/http/http.go b/internal/http/http.go
index cc1de21..9f32ed9 100644
--- a/internal/http/http.go
+++ b/internal/http/http.go
@@ -86,6 +86,8 @@ type Authenticator interface {
 	Authenticate(req *http.Request) error
 }
 
+// The current middleware implementation doesn't check the scope assigned to the token.
+// For now there is only one scope and at this moment I don't want to spend time on it
 func CreateAuthenticationMiddleware(checker Authenticator) mux.MiddlewareFunc {
 	return func(handler http.Handler) http.Handler {
 		return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
@@ -137,12 +139,3 @@ func apiForbidden(resp http.ResponseWriter, reason string) {
 	})
 	_, _ = resp.Write(result)
 }
-
-func apiNotFound(resp http.ResponseWriter, reason string) {
-	resp.WriteHeader(http.StatusNotFound)
-	resp.Header().Set("Content-Type", "application/json")
-	result, _ := json.Marshal([]interface{}{
-		reason,
-	})
-	_, _ = resp.Write(result)
-}
diff --git a/internal/http/jwt.go b/internal/http/jwt.go
deleted file mode 100644
index 94f196b..0000000
--- a/internal/http/jwt.go
+++ /dev/null
@@ -1,78 +0,0 @@
-package http
-
-import (
-	"errors"
-	"net/http"
-	"strings"
-	"time"
-
-	"github.com/SermoDigital/jose/crypto"
-	"github.com/SermoDigital/jose/jws"
-)
-
-var hashAlg = crypto.SigningMethodHS256
-
-const scopesClaim = "scopes"
-
-type Scope string
-
-var (
-	SkinScope = Scope("skin")
-)
-
-type JwtAuth struct {
-	Emitter
-	Key []byte
-}
-
-func (t *JwtAuth) NewToken(scopes ...Scope) ([]byte, error) {
-	if len(t.Key) == 0 {
-		return nil, errors.New("signing key not available")
-	}
-
-	claims := jws.Claims{}
-	claims.Set(scopesClaim, scopes)
-	claims.SetIssuedAt(time.Now())
-	encoder := jws.NewJWT(claims, hashAlg)
-	token, err := encoder.Serialize(t.Key)
-	if err != nil {
-		return nil, err
-	}
-
-	return token, nil
-}
-
-func (t *JwtAuth) Authenticate(req *http.Request) error {
-	if len(t.Key) == 0 {
-		return t.emitErr(errors.New("Signing key not set"))
-	}
-
-	bearerToken := req.Header.Get("Authorization")
-	if bearerToken == "" {
-		return t.emitErr(errors.New("Authentication header not presented"))
-	}
-
-	if !strings.EqualFold(bearerToken[0:7], "BEARER ") {
-		return t.emitErr(errors.New("Cannot recognize JWT token in passed value"))
-	}
-
-	tokenStr := bearerToken[7:]
-	token, err := jws.ParseJWT([]byte(tokenStr))
-	if err != nil {
-		return t.emitErr(errors.New("Cannot parse passed JWT token"))
-	}
-
-	err = token.Validate(t.Key, hashAlg)
-	if err != nil {
-		return t.emitErr(errors.New("JWT token have invalid signature. It may be corrupted or expired"))
-	}
-
-	t.Emit("authentication:success")
-
-	return nil
-}
-
-func (t *JwtAuth) emitErr(err error) error {
-	t.Emit("authentication:error", err)
-	return err
-}
diff --git a/internal/http/jwt_test.go b/internal/http/jwt_test.go
deleted file mode 100644
index 7e710b6..0000000
--- a/internal/http/jwt_test.go
+++ /dev/null
@@ -1,127 +0,0 @@
-package http
-
-import (
-	"net/http/httptest"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/mock"
-)
-
-const jwt = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxNTE2NjU4MTkzIiwic2NvcGVzIjoic2tpbiJ9.agbBS0qdyYMBaVfTZJAZcTTRgW1Y0kZty4H3N2JHBO8"
-
-func TestJwtAuth_NewToken(t *testing.T) {
-	t.Run("success", func(t *testing.T) {
-		jwt := &JwtAuth{Key: []byte("secret")}
-		token, err := jwt.NewToken(SkinScope)
-		assert.Nil(t, err)
-		assert.NotNil(t, token)
-	})
-
-	t.Run("key not provided", func(t *testing.T) {
-		jwt := &JwtAuth{}
-		token, err := jwt.NewToken(SkinScope)
-		assert.Error(t, err, "signing key not available")
-		assert.Nil(t, token)
-	})
-}
-
-func TestJwtAuth_Authenticate(t *testing.T) {
-	t.Run("success", func(t *testing.T) {
-		emitter := &emitterMock{}
-		emitter.On("Emit", "authentication:success")
-
-		req := httptest.NewRequest("POST", "http://localhost", nil)
-		req.Header.Add("Authorization", "Bearer "+jwt)
-		jwt := &JwtAuth{Key: []byte("secret"), Emitter: emitter}
-
-		err := jwt.Authenticate(req)
-		assert.Nil(t, err)
-
-		emitter.AssertExpectations(t)
-	})
-
-	t.Run("request without auth header", func(t *testing.T) {
-		emitter := &emitterMock{}
-		emitter.On("Emit", "authentication:error", mock.MatchedBy(func(err error) bool {
-			assert.Error(t, err, "Authentication header not presented")
-			return true
-		}))
-
-		req := httptest.NewRequest("POST", "http://localhost", nil)
-		jwt := &JwtAuth{Key: []byte("secret"), Emitter: emitter}
-
-		err := jwt.Authenticate(req)
-		assert.Error(t, err, "Authentication header not presented")
-
-		emitter.AssertExpectations(t)
-	})
-
-	t.Run("no bearer token prefix", func(t *testing.T) {
-		emitter := &emitterMock{}
-		emitter.On("Emit", "authentication:error", mock.MatchedBy(func(err error) bool {
-			assert.Error(t, err, "Cannot recognize JWT token in passed value")
-			return true
-		}))
-
-		req := httptest.NewRequest("POST", "http://localhost", nil)
-		req.Header.Add("Authorization", "this is not jwt")
-		jwt := &JwtAuth{Key: []byte("secret"), Emitter: emitter}
-
-		err := jwt.Authenticate(req)
-		assert.Error(t, err, "Cannot recognize JWT token in passed value")
-
-		emitter.AssertExpectations(t)
-	})
-
-	t.Run("bearer token but not jwt", func(t *testing.T) {
-		emitter := &emitterMock{}
-		emitter.On("Emit", "authentication:error", mock.MatchedBy(func(err error) bool {
-			assert.Error(t, err, "Cannot parse passed JWT token")
-			return true
-		}))
-
-		req := httptest.NewRequest("POST", "http://localhost", nil)
-		req.Header.Add("Authorization", "Bearer thisIs.Not.Jwt")
-		jwt := &JwtAuth{Key: []byte("secret"), Emitter: emitter}
-
-		err := jwt.Authenticate(req)
-		assert.Error(t, err, "Cannot parse passed JWT token")
-
-		emitter.AssertExpectations(t)
-	})
-
-	t.Run("when secret is not set", func(t *testing.T) {
-		emitter := &emitterMock{}
-		emitter.On("Emit", "authentication:error", mock.MatchedBy(func(err error) bool {
-			assert.Error(t, err, "Signing key not set")
-			return true
-		}))
-
-		req := httptest.NewRequest("POST", "http://localhost", nil)
-		req.Header.Add("Authorization", "Bearer "+jwt)
-		jwt := &JwtAuth{Emitter: emitter}
-
-		err := jwt.Authenticate(req)
-		assert.Error(t, err, "Signing key not set")
-
-		emitter.AssertExpectations(t)
-	})
-
-	t.Run("invalid signature", func(t *testing.T) {
-		emitter := &emitterMock{}
-		emitter.On("Emit", "authentication:error", mock.MatchedBy(func(err error) bool {
-			assert.Error(t, err, "JWT token have invalid signature. It may be corrupted or expired")
-			return true
-		}))
-
-		req := httptest.NewRequest("POST", "http://localhost", nil)
-		req.Header.Add("Authorization", "Bearer "+jwt)
-		jwt := &JwtAuth{Key: []byte("this is another secret"), Emitter: emitter}
-
-		err := jwt.Authenticate(req)
-		assert.Error(t, err, "JWT token have invalid signature. It may be corrupted or expired")
-
-		emitter.AssertExpectations(t)
-	})
-}
diff --git a/internal/security/jwt.go b/internal/security/jwt.go
new file mode 100644
index 0000000..878958c
--- /dev/null
+++ b/internal/security/jwt.go
@@ -0,0 +1,82 @@
+package security
+
+import (
+	"errors"
+	"fmt"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/golang-jwt/jwt/v5"
+
+	"ely.by/chrly/internal/version"
+)
+
+var now = time.Now
+var signingMethod = jwt.SigningMethodHS256
+
+const scopesClaim = "scopes"
+
+type Scope string
+
+const (
+	ProfileScope Scope = "profiles"
+)
+
+func NewJwt(key []byte) *Jwt {
+	return &Jwt{
+		Key: key,
+	}
+}
+
+type Jwt struct {
+	Key []byte
+}
+
+func (t *Jwt) NewToken(scopes ...Scope) (string, error) {
+	if len(scopes) == 0 {
+		return "", errors.New("you must specify at least one scope")
+	}
+
+	token := jwt.NewWithClaims(signingMethod, jwt.MapClaims{
+		"iss":       "chrly",
+		"iat":       now().Unix(),
+		scopesClaim: scopes,
+	})
+	token.Header["v"] = version.MajorVersion
+
+	return token.SignedString(t.Key)
+}
+
+// Keep those names generic in order to reuse them in future for alternative authentication methods
+var MissingAuthenticationError = errors.New("authentication value not provided")
+var InvalidTokenError = errors.New("passed authentication value is invalid")
+
+func (t *Jwt) Authenticate(req *http.Request) error {
+	bearerToken := req.Header.Get("Authorization")
+	if bearerToken == "" {
+		return MissingAuthenticationError
+	}
+
+	if !strings.HasPrefix(strings.ToLower(bearerToken), "bearer ") {
+		return InvalidTokenError
+	}
+
+	tokenStr := bearerToken[7:]
+	token, err := jwt.Parse(tokenStr, func(token *jwt.Token) (interface{}, error) {
+		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
+			return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
+		}
+
+		return t.Key, nil
+	})
+	if err != nil {
+		return errors.Join(InvalidTokenError, err)
+	}
+
+	if _, vHeaderExists := token.Header["v"]; !vHeaderExists {
+		return errors.Join(InvalidTokenError, errors.New("missing v header"))
+	}
+
+	return nil
+}
diff --git a/internal/security/jwt_test.go b/internal/security/jwt_test.go
new file mode 100644
index 0000000..40b53ea
--- /dev/null
+++ b/internal/security/jwt_test.go
@@ -0,0 +1,75 @@
+package security
+
+import (
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+const jwtString = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCIsInYiOjV9.eyJpYXQiOjE3MDY3ODY3NzUsImlzcyI6ImNocmx5Iiwic2NvcGVzIjpbInByb2ZpbGVzIl19.LrXrKo5iRFFHCDlMsVDhmJJheZqxbxuEVXB4XswHFKY"
+
+func TestJwtAuth_NewToken(t *testing.T) {
+	jwt := NewJwt([]byte("secret"))
+	now = func() time.Time {
+		return time.Date(2024, 2, 1, 11, 26, 15, 0, time.UTC)
+	}
+
+	t.Run("with scope", func(t *testing.T) {
+		token, err := jwt.NewToken(ProfileScope, "custom-scope")
+		require.NoError(t, err)
+		require.Equal(t, "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCIsInYiOjV9.eyJpYXQiOjE3MDY3ODY3NzUsImlzcyI6ImNocmx5Iiwic2NvcGVzIjpbInByb2ZpbGVzIiwiY3VzdG9tLXNjb3BlIl19.Iq673YyWWkJZjIkBmKYRN8Lx9qoD39S_e-MegG0aORM", token)
+	})
+
+	t.Run("no scopes", func(t *testing.T) {
+		token, err := jwt.NewToken()
+		require.Error(t, err)
+		require.Empty(t, token)
+	})
+}
+
+func TestJwtAuth_Authenticate(t *testing.T) {
+	jwt := NewJwt([]byte("secret"))
+	t.Run("success", func(t *testing.T) {
+		req := httptest.NewRequest("POST", "http://localhost", nil)
+		req.Header.Add("Authorization", "Bearer "+jwtString)
+		err := jwt.Authenticate(req)
+		require.NoError(t, err)
+	})
+
+	t.Run("request without auth header", func(t *testing.T) {
+		req := httptest.NewRequest("POST", "http://localhost", nil)
+		err := jwt.Authenticate(req)
+		require.ErrorIs(t, err, MissingAuthenticationError)
+	})
+
+	t.Run("no bearer token prefix", func(t *testing.T) {
+		req := httptest.NewRequest("POST", "http://localhost", nil)
+		req.Header.Add("Authorization", "trash")
+		err := jwt.Authenticate(req)
+		require.ErrorIs(t, err, InvalidTokenError)
+	})
+
+	t.Run("bearer token but not jwt", func(t *testing.T) {
+		req := httptest.NewRequest("POST", "http://localhost", nil)
+		req.Header.Add("Authorization", "Bearer seems.like.jwt")
+		err := jwt.Authenticate(req)
+		require.ErrorIs(t, err, InvalidTokenError)
+	})
+
+	t.Run("invalid signature", func(t *testing.T) {
+		req := httptest.NewRequest("POST", "http://localhost", nil)
+		req.Header.Add("Authorization", "Bearer "+jwtString+"123")
+		err := jwt.Authenticate(req)
+		require.ErrorIs(t, err, InvalidTokenError)
+	})
+
+	t.Run("missing v header", func(t *testing.T) {
+		req := httptest.NewRequest("POST", "http://localhost", nil)
+		req.Header.Add("Authorization", "Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpYXQiOjE3MDY3ODY3NzUsImlzcyI6ImNocmx5Iiwic2NvcGVzIjpbInByb2ZpbGVzIl19.zOX2ZKyU37kjwt1p9uCHxALxWQD2UC0wWcAcNvBXGq0")
+		err := jwt.Authenticate(req)
+		require.ErrorIs(t, err, InvalidTokenError)
+		require.ErrorContains(t, err, "missing v header")
+	})
+}
diff --git a/internal/signer/signer.go b/internal/security/signer.go
similarity index 74%
rename from internal/signer/signer.go
rename to internal/security/signer.go
index 963a241..991118c 100644
--- a/internal/signer/signer.go
+++ b/internal/security/signer.go
@@ -1,4 +1,4 @@
-package signer
+package security
 
 import (
 	"crypto"
@@ -6,37 +6,35 @@ import (
 	"crypto/rsa"
 	"crypto/sha1"
 	"encoding/base64"
-	"errors"
 )
 
 var randomReader = rand.Reader
 
+func NewSigner(key *rsa.PrivateKey) *Signer {
+	return &Signer{Key: key}
+}
+
 type Signer struct {
 	Key *rsa.PrivateKey
 }
 
 func (s *Signer) SignTextures(textures string) (string, error) {
-	if s.Key == nil {
-		return "", errors.New("Key is empty")
-	}
-
 	message := []byte(textures)
 	messageHash := sha1.New()
-	_, _ = messageHash.Write(message)
-	messageHashSum := messageHash.Sum(nil)
+	_, err := messageHash.Write(message)
+	if err != nil {
+		return "", err
+	}
 
+	messageHashSum := messageHash.Sum(nil)
 	signature, err := rsa.SignPKCS1v15(randomReader, s.Key, crypto.SHA1, messageHashSum)
 	if err != nil {
-		panic(err)
+		return "", err
 	}
 
 	return base64.StdEncoding.EncodeToString(signature), nil
 }
 
 func (s *Signer) GetPublicKey() (*rsa.PublicKey, error) {
-	if s.Key == nil {
-		return nil, errors.New("Key is empty")
-	}
-
 	return &s.Key.PublicKey, nil
 }
diff --git a/internal/security/signer_test.go b/internal/security/signer_test.go
new file mode 100644
index 0000000..e6891f7
--- /dev/null
+++ b/internal/security/signer_test.go
@@ -0,0 +1,43 @@
+package security
+
+import (
+	"crypto/rsa"
+	"crypto/x509"
+	"encoding/pem"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+type ConstantReader struct {
+}
+
+func (c *ConstantReader) Read(p []byte) (int, error) {
+	return 1, nil
+}
+
+func TestSigner_SignTextures(t *testing.T) {
+	randomReader = &ConstantReader{}
+
+	rawKey, _ := pem.Decode([]byte("-----BEGIN RSA PRIVATE KEY-----\nMIIBOwIBAAJBANbUpVCZkMKpfvYZ08W3lumdAaYxLBnmUDlzHBQH3DpYef5WCO32\nTDU6feIJ58A0lAywgtZ4wwi2dGHOz/1hAvcCAwEAAQJAItaxSHTe6PKbyEU/9pxj\nONdhYRYwVLLo56gnMYhkyoEqaaMsfov8hhoepkYZBMvZFB2bDOsQ2SaJ+E2eiBO4\nAQIhAPssS0+BR9w0bOdmjGqmdE9NrN5UJQcOW13s29+6QzUBAiEA2vWOepA5Apiu\npEA3pwoGdkVCrNSnnKjDQzDXBnpd3/cCIEFNd9sY4qUG4FWdXN6RnmXL7Sj0uZfH\nDMwzu8rEM5sBAiEAhvdoDNqLmbMdq3c+FsPSOeL1d21Zp/JK8kbPtFmHNf8CIQDV\n6FSZDwvWfuxaM7BsycQONkjDBTPNu+lqctJBGnBv3A==\n-----END RSA PRIVATE KEY-----\n"))
+	key, _ := x509.ParsePKCS1PrivateKey(rawKey.Bytes)
+
+	signer := NewSigner(key)
+
+	signature, err := signer.SignTextures("eyJ0aW1lc3RhbXAiOjE2MTQzMDcxMzQsInByb2ZpbGVJZCI6ImZmYzhmZGM5NTgyNDUwOWU4YTU3Yzk5Yjk0MGZiOTk2IiwicHJvZmlsZU5hbWUiOiJFcmlja1NrcmF1Y2giLCJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly9lbHkuYnkvc3RvcmFnZS9za2lucy82OWM2NzQwZDI5OTNlNWQ2ZjZhN2ZjOTI0MjBlZmMyOS5wbmcifX0sImVseSI6dHJ1ZX0")
+	require.NoError(t, err)
+	require.Equal(t, "IyHCxTP5ITquEXTHcwCtLd08jWWy16JwlQeWg8naxhoAVQecHGRdzHRscuxtdq/446kmeox7h4EfRN2A2ZLL+A==", signature)
+}
+
+func TestSigner_GetPublicKey(t *testing.T) {
+	randomReader = &ConstantReader{}
+
+	rawKey, _ := pem.Decode([]byte("-----BEGIN RSA PRIVATE KEY-----\nMIIBOwIBAAJBANbUpVCZkMKpfvYZ08W3lumdAaYxLBnmUDlzHBQH3DpYef5WCO32\nTDU6feIJ58A0lAywgtZ4wwi2dGHOz/1hAvcCAwEAAQJAItaxSHTe6PKbyEU/9pxj\nONdhYRYwVLLo56gnMYhkyoEqaaMsfov8hhoepkYZBMvZFB2bDOsQ2SaJ+E2eiBO4\nAQIhAPssS0+BR9w0bOdmjGqmdE9NrN5UJQcOW13s29+6QzUBAiEA2vWOepA5Apiu\npEA3pwoGdkVCrNSnnKjDQzDXBnpd3/cCIEFNd9sY4qUG4FWdXN6RnmXL7Sj0uZfH\nDMwzu8rEM5sBAiEAhvdoDNqLmbMdq3c+FsPSOeL1d21Zp/JK8kbPtFmHNf8CIQDV\n6FSZDwvWfuxaM7BsycQONkjDBTPNu+lqctJBGnBv3A==\n-----END RSA PRIVATE KEY-----\n"))
+	key, _ := x509.ParsePKCS1PrivateKey(rawKey.Bytes)
+
+	signer := NewSigner(key)
+
+	publicKey, err := signer.GetPublicKey()
+	require.NoError(t, err)
+	require.IsType(t, &rsa.PublicKey{}, publicKey)
+}
diff --git a/internal/signer/signer_test.go b/internal/signer/signer_test.go
deleted file mode 100644
index 6fc8fea..0000000
--- a/internal/signer/signer_test.go
+++ /dev/null
@@ -1,64 +0,0 @@
-package signer
-
-import (
-	"crypto/rsa"
-	"crypto/x509"
-	"encoding/pem"
-
-	"testing"
-
-	assert "github.com/stretchr/testify/require"
-)
-
-type ConstantReader struct {
-}
-
-func (c *ConstantReader) Read(p []byte) (int, error) {
-	return 1, nil
-}
-
-func TestSigner_SignTextures(t *testing.T) {
-	randomReader = &ConstantReader{}
-
-	t.Run("sign textures", func(t *testing.T) {
-		rawKey, _ := pem.Decode([]byte("-----BEGIN RSA PRIVATE KEY-----\nMIIBOwIBAAJBANbUpVCZkMKpfvYZ08W3lumdAaYxLBnmUDlzHBQH3DpYef5WCO32\nTDU6feIJ58A0lAywgtZ4wwi2dGHOz/1hAvcCAwEAAQJAItaxSHTe6PKbyEU/9pxj\nONdhYRYwVLLo56gnMYhkyoEqaaMsfov8hhoepkYZBMvZFB2bDOsQ2SaJ+E2eiBO4\nAQIhAPssS0+BR9w0bOdmjGqmdE9NrN5UJQcOW13s29+6QzUBAiEA2vWOepA5Apiu\npEA3pwoGdkVCrNSnnKjDQzDXBnpd3/cCIEFNd9sY4qUG4FWdXN6RnmXL7Sj0uZfH\nDMwzu8rEM5sBAiEAhvdoDNqLmbMdq3c+FsPSOeL1d21Zp/JK8kbPtFmHNf8CIQDV\n6FSZDwvWfuxaM7BsycQONkjDBTPNu+lqctJBGnBv3A==\n-----END RSA PRIVATE KEY-----\n"))
-		key, _ := x509.ParsePKCS1PrivateKey(rawKey.Bytes)
-
-		signer := &Signer{key}
-
-		signature, err := signer.SignTextures("eyJ0aW1lc3RhbXAiOjE2MTQzMDcxMzQsInByb2ZpbGVJZCI6ImZmYzhmZGM5NTgyNDUwOWU4YTU3Yzk5Yjk0MGZiOTk2IiwicHJvZmlsZU5hbWUiOiJFcmlja1NrcmF1Y2giLCJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly9lbHkuYnkvc3RvcmFnZS9za2lucy82OWM2NzQwZDI5OTNlNWQ2ZjZhN2ZjOTI0MjBlZmMyOS5wbmcifX0sImVseSI6dHJ1ZX0")
-		assert.NoError(t, err)
-		assert.Equal(t, "IyHCxTP5ITquEXTHcwCtLd08jWWy16JwlQeWg8naxhoAVQecHGRdzHRscuxtdq/446kmeox7h4EfRN2A2ZLL+A==", signature)
-	})
-
-	t.Run("empty key", func(t *testing.T) {
-		signer := &Signer{}
-
-		signature, err := signer.SignTextures("hello world")
-		assert.Error(t, err, "Key is empty")
-		assert.Empty(t, signature)
-	})
-}
-
-func TestSigner_GetPublicKey(t *testing.T) {
-	randomReader = &ConstantReader{}
-
-	t.Run("get public key", func(t *testing.T) {
-		rawKey, _ := pem.Decode([]byte("-----BEGIN RSA PRIVATE KEY-----\nMIIBOwIBAAJBANbUpVCZkMKpfvYZ08W3lumdAaYxLBnmUDlzHBQH3DpYef5WCO32\nTDU6feIJ58A0lAywgtZ4wwi2dGHOz/1hAvcCAwEAAQJAItaxSHTe6PKbyEU/9pxj\nONdhYRYwVLLo56gnMYhkyoEqaaMsfov8hhoepkYZBMvZFB2bDOsQ2SaJ+E2eiBO4\nAQIhAPssS0+BR9w0bOdmjGqmdE9NrN5UJQcOW13s29+6QzUBAiEA2vWOepA5Apiu\npEA3pwoGdkVCrNSnnKjDQzDXBnpd3/cCIEFNd9sY4qUG4FWdXN6RnmXL7Sj0uZfH\nDMwzu8rEM5sBAiEAhvdoDNqLmbMdq3c+FsPSOeL1d21Zp/JK8kbPtFmHNf8CIQDV\n6FSZDwvWfuxaM7BsycQONkjDBTPNu+lqctJBGnBv3A==\n-----END RSA PRIVATE KEY-----\n"))
-		key, _ := x509.ParsePKCS1PrivateKey(rawKey.Bytes)
-
-		signer := &Signer{key}
-
-		publicKey, err := signer.GetPublicKey()
-		assert.NoError(t, err)
-		assert.IsType(t, &rsa.PublicKey{}, publicKey)
-	})
-
-	t.Run("empty key", func(t *testing.T) {
-		signer := &Signer{}
-
-		publicKey, err := signer.GetPublicKey()
-		assert.Error(t, err, "Key is empty")
-		assert.Nil(t, publicKey)
-	})
-}
diff --git a/internal/version/version.go b/internal/version/version.go
index 7fc7cff..ca7bc20 100644
--- a/internal/version/version.go
+++ b/internal/version/version.go
@@ -1,5 +1,7 @@
 package version
 
+const MajorVersion = 5
+
 var (
 	version = "undefined"
 	commit  = "unknown"