diff --git a/api/middleware.go b/api/middleware.go
index 76ba44b..82ede60 100644
--- a/api/middleware.go
+++ b/api/middleware.go
@@ -17,6 +17,7 @@ import (
 	"net/http"
 	"strconv"
 	"strings"
+	"time"
 )
 
 const AUTHED_CONTEXT_KEY = "authed"
@@ -25,11 +26,27 @@ const WEBHOOK_CONTEXT_KEY = "webhook"
 
 const AuthCookieName = "auth-token"
 
+var _ = jwt.Claims(&standardClaims{})
+
 type standardClaims struct {
-	Issuer any `json:"iss,omitempty"`
+	Issuer    any `json:"iss,omitempty"`
+	ExpiresAt any `json:"exp,omitempty"`
 	jwt.StandardClaims
 }
 
+func (s *standardClaims) Valid() error {
+	if timeStr, ok := s.ExpiresAt.(string); ok {
+		t, err := time.Parse(time.RFC3339Nano, timeStr)
+		if err != nil {
+			return err
+		}
+
+		unixTimestamp := t.Unix()
+		s.ExpiresAt = unixTimestamp
+	}
+	return s.StandardClaims.Valid()
+}
+
 func findAuthToken(r *http.Request) string {
 	authHeader := parseAuthTokenHeader(r.Header)