diff --git a/internal/captcha/handler.go b/internal/captcha/handler.go
index c9117f3..b829172 100644
--- a/internal/captcha/handler.go
+++ b/internal/captcha/handler.go
@@ -4,10 +4,8 @@ import (
 	"bufio"
 	"bytes"
 	"encoding/base64"
-	"encoding/json"
 	"fmt"
 	"image"
-	"image/color"
 	"math"
 	"net/http"
 	"os"