diff --git a/go.mod b/go.mod
index b217808..37671fa 100644
--- a/go.mod
+++ b/go.mod
@@ -5,7 +5,6 @@ go 1.17
 require (
 	github.com/fogleman/gg v1.3.0
 	github.com/julienschmidt/httprouter v1.3.0
-	github.com/pkg/errors v0.9.1
 )
 
 require (
diff --git a/go.sum b/go.sum
index dc5dcf5..e42de81 100644
--- a/go.sum
+++ b/go.sum
@@ -4,8 +4,6 @@ github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF0
 github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
 github.com/julienschmidt/httprouter v1.3.0 h1:U0609e9tgbseu3rBINet9P48AI/D3oJs4dN7jwJOQ1U=
 github.com/julienschmidt/httprouter v1.3.0/go.mod h1:JR6WtHb+2LUe8TCKY3cZOxFyyO8IZAc4RVcycCCAKdM=
-github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
-github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 golang.org/x/image v0.0.0-20220617043117-41969df76e82 h1:KpZB5pUSBvrHltNEdK/tw0xlPeD13M6M6aGP32gKqiw=
 golang.org/x/image v0.0.0-20220617043117-41969df76e82/go.mod h1:doUCurBvlfPMKfmIpRIywoHmhN3VyhnoFDbvIEWF4hY=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
diff --git a/internal/captcha/captcha.go b/internal/captcha/captcha.go
index 886dbdd..9df4794 100644
--- a/internal/captcha/captcha.go
+++ b/internal/captcha/captcha.go
@@ -2,11 +2,10 @@ package captcha
 
 import (
 	"crypto/rand"
+	"errors"
 	"image"
 	"math/big"
 	"time"
-
-	"github.com/pkg/errors"
 )
 
 const (