diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 9b28452..fa0bb03 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -12,9 +12,9 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-go@v2
         with:
-          go-version: ^1.17
+          go-version: ^1.18
       - name: golangci-lint
-        uses: golangci/golangci-lint-action@v2
+        uses: golangci/golangci-lint-action@v3
         with:
           # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.
           version: latest
diff --git a/.github/workflows/vulns.yml b/.github/workflows/vulns.yml
index a96d6e3..19b2036 100644
--- a/.github/workflows/vulns.yml
+++ b/.github/workflows/vulns.yml
@@ -12,14 +12,9 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-go@v2
         with:
-          go-version: ^1.17
+          go-version: ^1.18
       - name: install depm
-        run: |
-          pushd $RUNNER_TEMP
-          curl -Lfs -o depm.tar.gz https://github.com/spiegel-im-spiegel/depm/releases/download/v0.4.4/depm_0.4.4_Linux_64bit.tar.gz
-          sudo tar -xzf depm.tar.gz
-          sudo mv depm /usr/local/bin/depm
-          popd
+        run: go install github.com/goark/depm@latest
       - name: WriteGoList
         run: depm list --json > go.list
       - name: Nancy
diff --git a/README.md b/README.md
index fd63a88..dad62fd 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,11 @@
 # [koyomi] -- 日本のこよみ
 
-[![check vulns](https://github.com/spiegel-im-spiegel/koyomi/workflows/vulns/badge.svg)](https://github.com/spiegel-im-spiegel/koyomi/actions)
-[![lint status](https://github.com/spiegel-im-spiegel/koyomi/workflows/lint/badge.svg)](https://github.com/spiegel-im-spiegel/koyomi/actions)
-[![GitHub license](https://img.shields.io/badge/license-Apache%202-blue.svg)](https://raw.githubusercontent.com/spiegel-im-spiegel/koyomi/master/LICENSE)
-[![GitHub release](https://img.shields.io/github/release/spiegel-im-spiegel/koyomi.svg)](https://github.com/spiegel-im-spiegel/koyomi/releases/latest)
+[![check vulns](https://github.com/goark/koyomi/workflows/vulns/badge.svg)](https://github.com/goark/koyomi/actions)
+[![lint status](https://github.com/goark/koyomi/workflows/lint/badge.svg)](https://github.com/goark/koyomi/actions)
+[![GitHub license](https://img.shields.io/badge/license-Apache%202-blue.svg)](https://raw.githubusercontent.com/goark/koyomi/master/LICENSE)
+[![GitHub release](https://img.shields.io/github/release/goark/koyomi.svg)](https://github.com/goark/koyomi/releases/latest)
+
+**Migrated repository to [github.com/goark/koyomi][koyomi]**
 
 「[国立天文台 天文情報センター 暦計算室](http://eco.mtk.nao.ac.jp/koyomi/)」より日本の暦情報を取得する [Go 言語]用パッケージです。 Google Calendar を経由して取得しています。
 
@@ -62,4 +64,4 @@ io.Copy(os.Stdout, bytes.NewReader(csv))
 - [日本の暦情報を取得するパッケージを作ってみた — リリース情報 | text.Baldanders.info](https://text.baldanders.info/release/2020/05/koyomi/)
 
 [Go 言語]: https://golang.org/ "The Go Programming Language"
-[koyomi]: https://github.com/spiegel-im-spiegel/koyomi "spiegel-im-spiegel/koyomi: 日本のこよみ"
+[koyomi]: https://github.com/goark/koyomi "goark/koyomi: 日本のこよみ"
diff --git a/Taskfile.yml b/Taskfile.yml
index 116721e..84b8e69 100644
--- a/Taskfile.yml
+++ b/Taskfile.yml
@@ -13,7 +13,7 @@ tasks:
     cmds:
       - go mod verify
       - go test -shuffle on ./...
-      - docker run --rm -v $(pwd):/app -w /app golangci/golangci-lint:v1.42.0 golangci-lint run --enable gosec --timeout 3m0s ./...
+      - docker run --rm -v $(pwd):/app -w /app golangci/golangci-lint:v1.45.0 golangci-lint run --enable gosec --timeout 3m0s ./...
     sources:
       - ./go.mod
       - '**/*.go'
@@ -21,7 +21,7 @@ tasks:
   nancy:
     desc: Check vulnerability of external packages with Nancy.
     cmds:
-      - depm list -j | docker run --rm -i sonatypecommunity/nancy:latest sleuth -n
+      - depm list -j | nancy sleuth -n
     sources:
       - ./go.mod
       - '**/*.go'
@@ -32,7 +32,7 @@ tasks:
       - rm -f ./go.sum
       - go clean -cache
       - go clean -modcache
-      - go mod tidy -v -go=1.17
+      - go mod tidy -v -go=1.18
 
   graph:
     desc: Make grapth of dependency modules.
diff --git a/date.go b/date.go
index a3781aa..d800205 100644
--- a/date.go
+++ b/date.go
@@ -5,7 +5,7 @@ import (
 	"strings"
 	"time"
 
-	"github.com/spiegel-im-spiegel/errs"
+	"github.com/goark/errs"
 )
 
 var (
diff --git a/dependency.png b/dependency.png
index ba621d3..bbfc863 100644
Binary files a/dependency.png and b/dependency.png differ
diff --git a/ecode/ecode.go b/ecode/ecode.go
index d3139d8..2d2e14e 100644
--- a/ecode/ecode.go
+++ b/ecode/ecode.go
@@ -1,30 +1,14 @@
 package ecode
 
-import "fmt"
+import "errors"
 
-//ECode is error codes for books-data
-type ECode int
-
-const (
-	ErrNullPointer ECode = iota + 1
-	ErrNoData
-	ErrInvalidRecord
+var (
+	ErrNullPointer   = errors.New("Null reference instance")
+	ErrNoData        = errors.New("No data")
+	ErrInvalidRecord = errors.New("Invalid record")
 )
 
-var errMessages = map[ECode]string{
-	ErrNullPointer:   "Null reference instance",
-	ErrNoData:        "No data",
-	ErrInvalidRecord: "Invalid record",
-}
-
-func (e ECode) Error() string {
-	if s, ok := errMessages[e]; ok {
-		return s
-	}
-	return fmt.Sprintf("unknown error (%d)", int(e))
-}
-
-/* Copyright 2020 Spiegel
+/* Copyright 2020-2022 Spiegel
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
diff --git a/ecode/ecode_test.go b/ecode/ecode_test.go
deleted file mode 100644
index fc9b1a1..0000000
--- a/ecode/ecode_test.go
+++ /dev/null
@@ -1,42 +0,0 @@
-package ecode
-
-import (
-	"fmt"
-	"testing"
-)
-
-func TestECodeError(t *testing.T) {
-	testCases := []struct {
-		err error
-		str string
-	}{
-		{err: ECode(0), str: "unknown error (0)"},
-		{err: ErrNullPointer, str: "Null reference instance"},
-		{err: ErrNoData, str: "No data"},
-		{err: ErrInvalidRecord, str: "Invalid record"},
-		{err: ECode(4), str: "unknown error (4)"},
-	}
-
-	for _, tc := range testCases {
-		errStr := tc.err.Error()
-		if errStr != tc.str {
-			t.Errorf("\"%v\" != \"%v\"", errStr, tc.str)
-		}
-		fmt.Printf("Info(TestECodeError): %+v\n", tc.err)
-	}
-}
-
-/* Copyright 2020 Spiegel
-*
-* Licensed under the Apache License, Version 2.0 (the "License");
-* you may not use this file except in compliance with the License.
-* You may obtain a copy of the License at
-*
-* 	http://www.apache.org/licenses/LICENSE-2.0
-*
-* Unless required by applicable law or agreed to in writing, software
-* distributed under the License is distributed on an "AS IS" BASIS,
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-* See the License for the specific language governing permissions and
-* limitations under the License.
- */
diff --git a/events.go b/events.go
index c6bbb98..9d337d6 100644
--- a/events.go
+++ b/events.go
@@ -7,8 +7,8 @@ import (
 	"sort"
 	"strconv"
 
-	"github.com/spiegel-im-spiegel/errs"
-	"github.com/spiegel-im-spiegel/koyomi/ecode"
+	"github.com/goark/errs"
+	"github.com/goark/koyomi/ecode"
 )
 
 //Event is koyomi event data
diff --git a/example_test.go b/example_test.go
index e7113c8..d13d49e 100644
--- a/example_test.go
+++ b/example_test.go
@@ -7,7 +7,7 @@ import (
 	"os"
 	"time"
 
-	"github.com/spiegel-im-spiegel/koyomi"
+	"github.com/goark/koyomi"
 )
 
 func ExampleKoyomi() {
diff --git a/go.mod b/go.mod
index 6b8add6..e46ffc2 100644
--- a/go.mod
+++ b/go.mod
@@ -1,13 +1,13 @@
-module github.com/spiegel-im-spiegel/koyomi
+module github.com/goark/koyomi
 
-go 1.17
+go 1.18
 
 require (
 	github.com/PuloV/ics-golang v0.0.0-20190808201353-a3394d3bcade
-	github.com/spiegel-im-spiegel/errs v1.0.5
+	github.com/goark/errs v1.1.0
 )
 
 require (
 	github.com/channelmeter/iso8601duration v0.0.0-20150204201828-8da3af7a2a61 // indirect
-	github.com/stretchr/testify v1.7.0 // indirect
+	github.com/stretchr/testify v1.7.1 // indirect
 )
diff --git a/go.sum b/go.sum
index 8d9d53a..1110653 100644
--- a/go.sum
+++ b/go.sum
@@ -4,13 +4,13 @@ github.com/channelmeter/iso8601duration v0.0.0-20150204201828-8da3af7a2a61 h1:o6
 github.com/channelmeter/iso8601duration v0.0.0-20150204201828-8da3af7a2a61/go.mod h1:Rp8e0DCtEKwXFOC6JPJQVTz8tuGoGvw6Xfexggh/ed0=
 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/goark/errs v1.1.0 h1:FKnyw4LVyRADIjM8Nj0Up6r0/y5cfADvZAd1E+tthXE=
+github.com/goark/errs v1.1.0/go.mod h1:TtaPEoadm2mzqzfXdkkfpN2xuniCFm2q4JH+c1qzaqw=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/spiegel-im-spiegel/errs v1.0.5 h1:5qAUEXPZgF4ZIUmw2vpe7OgDP0C8DIV67BKwjfLidJI=
-github.com/spiegel-im-spiegel/errs v1.0.5/go.mod h1:mOsWcUc9hpRXjwdgJqJ3E2n6ibkYFvhNck1QD0ZVGOM=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
-github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.7.1 h1:5TQK59W5E3v0r2duFAb7P95B6hEeOyEnHRa8MjYSMTY=
+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/source.go b/source.go
index fc4abee..8353c93 100644
--- a/source.go
+++ b/source.go
@@ -2,8 +2,8 @@ package koyomi
 
 import (
 	ics "github.com/PuloV/ics-golang"
-	"github.com/spiegel-im-spiegel/errs"
-	"github.com/spiegel-im-spiegel/koyomi/ecode"
+	"github.com/goark/errs"
+	"github.com/goark/koyomi/ecode"
 )
 
 //Source is information of data source for koyomi