diff --git a/api-reference/apis/admin-api/authentication-and-security.md b/api-reference/apis/admin-api/authentication-and-security.md
index 35920e6..c4c878b 100644
--- a/api-reference/apis/admin-api/authentication-and-security.md
+++ b/api-reference/apis/admin-api/authentication-and-security.md
@@ -33,10 +33,10 @@ import (
 	"os"
 	"time"
 
-	"github.com/lestrrat-go/jwx/v2/jwa"
-	"github.com/lestrrat-go/jwx/v2/jwk"
-	"github.com/lestrrat-go/jwx/v2/jws"
-	"github.com/lestrrat-go/jwx/v2/jwt"
+	"github.com/lestrrat-go/jwx/v3/jwa"
+	"github.com/lestrrat-go/jwx/v3/jwk"
+	"github.com/lestrrat-go/jwx/v3/jws"
+	"github.com/lestrrat-go/jwx/v3/jwt"
 )
 
 // Replace "myapp" with your project ID here.
@@ -68,7 +68,7 @@ func main() {
 	_ = payload.Set(jwt.ExpirationKey, now.Add(5*time.Minute).Unix())
 
 	// The alg MUST be RS256.
-	alg := jwa.RS256
+	alg := jwa.RS256()
 	hdr := jws.NewHeaders()
 	hdr.Set("typ", "JWT")
 
diff --git a/authentication-and-access/authentication/reauthentication.md b/authentication-and-access/authentication/reauthentication.md
index 4738779..3a24c7f 100644
--- a/authentication-and-access/authentication/reauthentication.md
+++ b/authentication-and-access/authentication/reauthentication.md
@@ -503,8 +503,8 @@ import (
     "net/http"
     "time"
 
-    "github.com/lestrrat-go/jwx/jwk"
-    "github.com/lestrrat-go/jwx/jwt"
+    "github.com/lestrrat-go/jwx/v3/jwk"
+    "github.com/lestrrat-go/jwx/v3/jwt"
 )
 
 var (
@@ -558,7 +558,13 @@ func CheckIDToken(idToken string) error {
     }
 
     // parse jwt token
-    token, err := jwt.ParseString(idToken, jwt.WithKeySet(set))
+    token, err := jwt.ParseString(
+        idToken, 
+        // This may not work out of the box depending on the jwk.Set.
+        // Please read about requirements for "kid" and "alg" (and possibly
+        // "WithDefaultKey") when using jwk.Set in the jwt.WithKeySet documentation.
+        jwt.WithKeySet(set),
+    )
     if err != nil {
         return fmt.Errorf("invalid token: %s", err)
     }
@@ -574,14 +580,9 @@ func CheckIDToken(idToken string) error {
         return fmt.Errorf("invalid token: %s", err)
     }
 
-    authTimeAny, ok := token.Get("auth_time")
-    if !ok {
-        return fmt.Errorf("no auth_time")
-    }
-
-    authTimeUnix, ok := authTimeAny.(float64)
-    if !ok {
-        return fmt.Errorf("auth_time is not number")
+    var authTimeUnix float64
+    if err := token.Get("auth_time", &authTimeUnix); err != nil {
+        return fmt.Errorf("no auth_time: %w", err)
     }
 
     authTime := time.Unix(int64(authTimeUnix), 0)
diff --git a/get-started/backend-api/jwt.md b/get-started/backend-api/jwt.md
index f1cbf6e..d56b957 100644
--- a/get-started/backend-api/jwt.md
+++ b/get-started/backend-api/jwt.md
@@ -273,8 +273,8 @@ import (
     "regexp"
     "time"
 
-    "github.com/lestrrat-go/jwx/jwk"
-    "github.com/lestrrat-go/jwx/jwt"
+    "github.com/lestrrat-go/jwx/v3/jwk"
+    "github.com/lestrrat-go/jwx/v3/jwt"
 )
 
 
@@ -322,25 +322,24 @@ func FetchJWK(baseAddress string) (jwk.Set, error) {
 }
 
 // DecodeUser parse request Authorization header and obtain user id and claims
-func DecodeUser(r *http.Request) (string, map[string]interface{}, error) {
+func DecodeUser(r *http.Request) (string, bool, bool, error)
     // fetch jwks_uri from Authgear
-    // you can cache the value of jwks to have better performance
+    // you can cache the value of jwks using jwk.Cache to have better performance
     set, err := FetchJWK(baseAddress)
     if err != nil {
-        return "", nil, fmt.Errorf("failed to fetch JWK: %s", err)
-    }
-
-    // get jwt token from Authorization header
-    authzHeader := r.Header.Get("Authorization")
-    match := authzHeaderRegexp.FindStringSubmatch(authzHeader)
-    if len(match) != 2 {
-        return "", nil, fmt.Errorf("no token")
+        return "", false, false, fmt.Errorf("failed to fetch JWK: %s", err)
     }
 
     // parse jwt token
-    token, err := jwt.ParseString(match[1], jwt.WithKeySet(set))
+    token, err := jwt.ParseRequest(
+        r, 
+        // This may not work out of the box depending on the jwk.Set.
+        // Please read about requirements for "kid" and "alg" (and possibly
+        // "WithDefaultKey") when using jwk.Set in the jwt.WithKeySet documentation.
+        jwt.WithKeySet(set),
+    )
     if err != nil {
-        return "", nil, fmt.Errorf("invalid token: %s", err)
+        return "", false, false, fmt.Errorf("invalid token: %s", err)
     }
 
     // validate jwt token
@@ -351,19 +350,21 @@ func DecodeUser(r *http.Request) (string, map[string]interface{}, error) {
         jwt.WithAudience(baseAddress),
     )
     if err != nil {
-        return "", nil, fmt.Errorf("invalid token: %s", err)
+        return "", false, false, fmt.Errorf("invalid token: %s", err)
     }
 
-    return token.Subject(), token.PrivateClaims(), nil
+    var verified bool
+    var anonymous bool
+    // ignore errors -- if the the claim does not exist, it doesn't matter
+    _ = token.Get("https://authgear.com/claims/user/is_verified", &verified)
+    _ = token.Get("https://authgear.com/claims/user/is_anonymous", &anonymous)
+
+    return token.Subject(), verified, anonymous, nil
 }
 
 func handler(w http.ResponseWriter, r *http.Request) {
     // decode user example
-    userid, claims, err := DecodeUser(r)
-    isUserVerified, _ :=
-        claims["https://authgear.com/claims/user/is_verified"].(bool)
-    isAnonymousUser, _ :=
-        claims["https://authgear.com/claims/user/is_anonymous"].(bool)
+    userid, isUserVerified, isAnonymousUser, err := DecodeUser(r)
 
     // ... your handler logic
 }