JWT middleware has been changed from github.com/dgrijalva/jwt-go to github.com/golang-jwt/jwt` due former library being unmaintained and having security

issues.
NOTE: `golang-jwt/jwt` now only supports last 2 Go releases. So 1.15+
For detailed information please read #1940

Author: aldas

go.mod

@@ -3,7 +3,7 @@ module github.com/labstack/echo/v4
 go 1.15
 
 require (
-	github.com/dgrijalva/jwt-go v3.2.0+incompatible
+	github.com/golang-jwt/jwt v3.2.2+incompatible
 	github.com/labstack/gommon v0.3.0
 	github.com/mattn/go-colorable v0.1.8 // indirect
 	github.com/stretchr/testify v1.4.0

go.sum

@@ -1,7 +1,7 @@
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumCAMpl/TFQ4/5kLM=
-github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
+github.com/golang-jwt/jwt v3.2.2+incompatible h1:IfV12K8xAKAnZqdXVzCZ+TOjboZ2keLg81eXfW3O+oY=
+github.com/golang-jwt/jwt v3.2.2+incompatible/go.mod h1:8pz2t5EyA70fFQQSrl6XZXzqecmYZeUEB8OUGHkxJ+I=
 github.com/labstack/gommon v0.3.0 h1:JEeO0bvc78PKdyHxloTKiF8BD5iGrH8T6MSeGvSgob0=
 github.com/labstack/gommon v0.3.0/go.mod h1:MULnywXg0yavhxWKc+lOruYdAhDwPK9wf0OL7NoOu+k=
 github.com/mattn/go-colorable v0.1.2/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=

middleware/jwt.go

@@ -1,3 +1,5 @@
+// +build go1.15
+
 package middleware
 
 import (
@@ -7,7 +9,7 @@ import (
 	"reflect"
 	"strings"
 
-	"github.com/dgrijalva/jwt-go"
+	"github.com/golang-jwt/jwt"
 	"github.com/labstack/echo/v4"
 )
 
@@ -88,7 +90,7 @@ type (
 
 		// ParseTokenFunc defines a user-defined function that parses token from given auth. Returns an error when token
 		// parsing fails or parsed token is invalid.
-		// Defaults to implementation using `github.com/dgrijalva/jwt-go` as JWT implementation library
+		// Defaults to implementation using `github.com/golang-jwt/jwt` as JWT implementation library
 		ParseTokenFunc func(auth string, c echo.Context) (interface{}, error)
 	}
 

middleware/jwt_test.go

@@ -1,3 +1,5 @@
+// +build go1.15
+
 package middleware
 
 import (
@@ -9,7 +11,7 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/dgrijalva/jwt-go"
+	"github.com/golang-jwt/jwt"
 	"github.com/labstack/echo/v4"
 	"github.com/stretchr/testify/assert"
 )
@@ -562,7 +564,7 @@ func TestJWTConfig_custom_ParseTokenFunc_Keyfunc(t *testing.T) {
 		return c.String(http.StatusTeapot, "test")
 	})
 
-	// example of minimal custom ParseTokenFunc implementation. Allows you to use different versions of `github.com/dgrijalva/jwt-go`
+	// example of minimal custom ParseTokenFunc implementation. Allows you to use different versions of `github.com/golang-jwt/jwt`
 	// with current JWT middleware
 	signingKey := []byte("secret")