diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..65e1ec0
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,3 @@
+{
+    "makefile.extensionOutputFolder": "./.vscode"
+}
\ No newline at end of file
diff --git a/Godeps/Godeps.json b/Godeps/Godeps.json
deleted file mode 100644
index b17aa5c..0000000
--- a/Godeps/Godeps.json
+++ /dev/null
@@ -1,54 +0,0 @@
-{
-	"ImportPath": "github.com/yudai/gotty",
-	"GoVersion": "go1.9",
-	"GodepVersion": "v79",
-	"Deps": [
-		{
-			"ImportPath": "github.com/NYTimes/gziphandler",
-			"Rev": "967539e5e271a2bc9b3dcb1285078a1b1df105ae"
-		},
-		{
-			"ImportPath": "github.com/codegangsta/cli",
-			"Comment": "v1.19.1",
-			"Rev": "0bdeddeeb0f650497d603c4ad7b20cfe685682f6"
-		},
-		{
-			"ImportPath": "github.com/elazarl/go-bindata-assetfs",
-			"Rev": "d5cac425555ca5cf00694df246e04f05e6a55150"
-		},
-		{
-			"ImportPath": "github.com/fatih/structs",
-			"Rev": "a9f7daa9c2729e97450c2da2feda19130a367d8f"
-		},
-		{
-			"ImportPath": "github.com/gorilla/websocket",
-			"Rev": "b6ab76f1fe9803ee1d59e7e5b2a797c1fe897ce5"
-		},
-		{
-			"ImportPath": "github.com/hashicorp/go-multierror",
-			"Rev": "56912fb08d85084aa318edcf2bba735b97cf35c5"
-		},
-		{
-			"ImportPath": "github.com/kr/pty",
-			"Comment": "release.r56-28-g5cf931e",
-			"Rev": "5cf931ef8f76dccd0910001d74a58a7fca84a83d"
-		},
-		{
-			"ImportPath": "github.com/pkg/errors",
-			"Comment": "v0.8.0-2-g248dadf",
-			"Rev": "248dadf4e9068a0b3e79f02ed0a610d935de5302"
-		},
-		{
-			"ImportPath": "github.com/yudai/hcl",
-			"Rev": "5fa2393b3552119bf33a69adb1402a1160cba23d"
-		},
-		{
-			"ImportPath": "github.com/yudai/hcl/hcl",
-			"Rev": "5fa2393b3552119bf33a69adb1402a1160cba23d"
-		},
-		{
-			"ImportPath": "github.com/yudai/hcl/json",
-			"Rev": "5fa2393b3552119bf33a69adb1402a1160cba23d"
-		}
-	]
-}
diff --git a/Godeps/Readme b/Godeps/Readme
deleted file mode 100644
index 4cdaa53..0000000
--- a/Godeps/Readme
+++ /dev/null
@@ -1,5 +0,0 @@
-This directory tree is generated automatically by godep.
-
-Please do not edit.
-
-See https://github.com/tools/godep for more information.
diff --git a/Makefile b/Makefile
index 0326580..b7225f2 100644
--- a/Makefile
+++ b/Makefile
@@ -3,8 +3,8 @@ GIT_COMMIT = `git rev-parse HEAD | cut -c1-7`
 VERSION = 2.0.0-alpha.3
 BUILD_OPTIONS = -ldflags "-X main.Version=$(VERSION) -X main.CommitID=$(GIT_COMMIT)"
 
-gotty: main.go server/*.go webtty/*.go backend/*.go Makefile
-	godep go build ${BUILD_OPTIONS}
+gotty: main.go server/*.go webtty/*.go backend/*.go Makefile go.sum
+	go build ${BUILD_OPTIONS}
 
 .PHONY: asset
 asset: bindata/static/js/gotty-bundle.js bindata/static/index.html bindata/static/favicon.png bindata/static/css/index.css bindata/static/css/xterm.css bindata/static/css/xterm_customize.css
diff --git a/backend/localcommand/factory.go b/backend/localcommand/factory.go
index 11810ed..820b6a9 100644
--- a/backend/localcommand/factory.go
+++ b/backend/localcommand/factory.go
@@ -4,7 +4,7 @@ import (
 	"syscall"
 	"time"
 
-	"github.com/yudai/gotty/server"
+	"gotty/server"
 )
 
 type Options struct {
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..25b72e7
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,24 @@
+module gotty
+
+go 1.18
+
+require (
+	github.com/NYTimes/gziphandler v1.1.1
+	github.com/elazarl/go-bindata-assetfs v1.0.1
+	github.com/fatih/structs v1.1.0
+	github.com/gorilla/websocket v1.5.0
+	github.com/hashicorp/go-multierror v1.1.1
+	github.com/kr/pty v1.1.8
+	github.com/pkg/errors v0.9.1
+	github.com/urfave/cli v1.22.9
+	github.com/yudai/hcl v0.0.0-20151013225006-5fa2393b3552
+)
+
+require (
+	github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
+	github.com/creack/pty v1.1.18 // indirect
+	github.com/hashicorp/errwrap v1.0.0 // indirect
+	github.com/russross/blackfriday/v2 v2.1.0 // indirect
+	github.com/shurcooL/sanitized_anchor_name v1.0.0 // indirect
+	golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..08fb5dc
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,52 @@
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/NYTimes/gziphandler v0.0.0-20170804200234-967539e5e271/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
+github.com/NYTimes/gziphandler v1.1.1 h1:ZUDjpQae29j0ryrS0u/B8HZfJBtBQHjqw2rQ2cqUQ3I=
+github.com/NYTimes/gziphandler v1.1.1/go.mod h1:n/CVRwUEOgIxrgPvAQhUUr9oeUtvrhMomdKFjzJNB0c=
+github.com/codegangsta/cli v1.19.1/go.mod h1:/qJNoX69yVSKu5o4jLyXAENLRyk1uhi7zkbQ3slBdOA=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d h1:U+s90UTSYgptZMwQh2aRr3LuazLJIa+Pg3Kc1ylSYVY=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
+github.com/cpuguy83/go-md2man/v2 v2.0.2 h1:p1EgwI/C7NhT0JmVkwCD2ZBK8j4aeHQX2pMHHBfMQ6w=
+github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/creack/pty v1.1.7 h1:6pwm8kMQKCmgUg0ZHTm5+/YvRK0s3THD/28+T6/kk4A=
+github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY=
+github.com/creack/pty v1.1.18 h1:n56/Zwd5o6whRC5PMGretI4IdRLlmBXYNjScPaBgsbY=
+github.com/creack/pty v1.1.18/go.mod h1:MOBLtS5ELjhRRrroQr9kyvTxUAFNvYEK993ew/Vr4O4=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/elazarl/go-bindata-assetfs v0.0.0-20150813044622-d5cac425555c/go.mod h1:v+YaWX3bdea5J/mo8dSETolEo7R71Vk1u8bnjau5yw4=
+github.com/elazarl/go-bindata-assetfs v1.0.1 h1:m0kkaHRKEu7tUIUFVwhGGGYClXvyl4RE03qmvRTNfbw=
+github.com/elazarl/go-bindata-assetfs v1.0.1/go.mod h1:v+YaWX3bdea5J/mo8dSETolEo7R71Vk1u8bnjau5yw4=
+github.com/fatih/structs v0.0.0-20150526064352-a9f7daa9c272/go.mod h1:9NiDSp5zOcgEDl+j00MP/WkGVPOlPRLejGD8Ga6PJ7M=
+github.com/fatih/structs v1.1.0 h1:Q7juDM0QtcnhCpeyLGQKyg4TOIghuNXrkL32pHAUMxo=
+github.com/fatih/structs v1.1.0/go.mod h1:9NiDSp5zOcgEDl+j00MP/WkGVPOlPRLejGD8Ga6PJ7M=
+github.com/gorilla/websocket v0.0.0-20150811171432-b6ab76f1fe98/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=
+github.com/gorilla/websocket v1.5.0 h1:PPwGk2jz7EePpoHN/+ClbZu8SPxiqlu12wZP/3sWmnc=
+github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
+github.com/hashicorp/errwrap v1.0.0 h1:hLrqtEDnRye3+sgx6z4qVLNuviH3MR5aQ0ykNJa/UYA=
+github.com/hashicorp/errwrap v1.0.0/go.mod h1:YH+1FKiLXxHSkmPseP+kNlulaMuP3n2brvKWEqk/Jc4=
+github.com/hashicorp/go-multierror v0.0.0-20150608033521-56912fb08d85 h1:cUIqw6AGGDeIa1KYdG1mLl/bX+WGDbvZJ+dhb2tprxo=
+github.com/hashicorp/go-multierror v0.0.0-20150608033521-56912fb08d85/go.mod h1:JMRHfdO9jKNzS/+BTlxCjKNQHg/jZAft8U7LloJvN7I=
+github.com/hashicorp/go-multierror v1.1.1 h1:H5DkEtf6CXdFp0N0Em5UCwQpXMWke8IA0+lD48awMYo=
+github.com/hashicorp/go-multierror v1.1.1/go.mod h1:iw975J/qwKPdAO1clOe2L8331t/9/fmwbPZ6JB6eMoM=
+github.com/kr/pty v0.0.0-20150511174710-5cf931ef8f76/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/pty v1.1.8 h1:AkaSdXYQOWeaO3neb8EM634ahkXXe3jYbVh/F9lq+GI=
+github.com/kr/pty v1.1.8/go.mod h1:O1sed60cT9XZ5uDucP5qwvh+TE3NnUj51EiZO/lmSfw=
+github.com/pkg/errors v0.8.1-0.20161029093637-248dadf4e906/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/russross/blackfriday/v2 v2.0.1 h1:lPqVAte+HuHNfhJ/0LC98ESWRz8afy9tM/0RK8m9o+Q=
+github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf35Ld67mk=
+github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/shurcooL/sanitized_anchor_name v1.0.0 h1:PdmoCO6wvbs+7yrJyMORt4/BmY5IYyJwS/kOiWx8mHo=
+github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/urfave/cli v1.22.9 h1:cv3/KhXGBGjEXLC4bH0sLuJ9BewaAbpk5oyMOveu4pw=
+github.com/urfave/cli v1.22.9/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
+github.com/yudai/hcl v0.0.0-20151013225006-5fa2393b3552 h1:tjsK9T2IA3d2FFNxzDP7AJf+EXhyuPd7PB4Z2HrtAoc=
+github.com/yudai/hcl v0.0.0-20151013225006-5fa2393b3552/go.mod h1:hg0ZaCmQL3rze1cH8Fh2g0a9q8vQs0uN8ESpePEwSEw=
+golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f h1:v4INt8xihDGvnrfjMDVXGxw9wrfxYyCjk0KbXjhR55s=
+golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
diff --git a/main.go b/main.go
index b6290be..755c1e2 100644
--- a/main.go
+++ b/main.go
@@ -9,12 +9,12 @@ import (
 	"strings"
 	"syscall"
 
-	"github.com/codegangsta/cli"
+	"github.com/urfave/cli"
 
-	"github.com/yudai/gotty/backend/localcommand"
-	"github.com/yudai/gotty/pkg/homedir"
-	"github.com/yudai/gotty/server"
-	"github.com/yudai/gotty/utils"
+	"gotty/backend/localcommand"
+	"gotty/pkg/homedir"
+	"gotty/server"
+	"gotty/utils"
 )
 
 func main() {
diff --git a/server/handlers.go b/server/handlers.go
index f1a2f9b..4efb071 100644
--- a/server/handlers.go
+++ b/server/handlers.go
@@ -13,7 +13,7 @@ import (
 	"github.com/gorilla/websocket"
 	"github.com/pkg/errors"
 
-	"github.com/yudai/gotty/webtty"
+	"gotty/webtty"
 )
 
 func (server *Server) generateHandleWS(ctx context.Context, cancel context.CancelFunc, counter *counter) http.HandlerFunc {
diff --git a/server/server.go b/server/server.go
index 6411e71..64dc71b 100644
--- a/server/server.go
+++ b/server/server.go
@@ -14,13 +14,13 @@ import (
 	"time"
 
 	"github.com/NYTimes/gziphandler"
-	"github.com/elazarl/go-bindata-assetfs"
+	assetfs "github.com/elazarl/go-bindata-assetfs"
 	"github.com/gorilla/websocket"
 	"github.com/pkg/errors"
 
-	"github.com/yudai/gotty/pkg/homedir"
-	"github.com/yudai/gotty/pkg/randomstring"
-	"github.com/yudai/gotty/webtty"
+	"gotty/pkg/homedir"
+	"gotty/pkg/randomstring"
+	"gotty/webtty"
 )
 
 // Server provides a webtty HTTP endpoint.
diff --git a/server/slave.go b/server/slave.go
index 77d0973..eb60883 100644
--- a/server/slave.go
+++ b/server/slave.go
@@ -1,7 +1,7 @@
 package server
 
 import (
-	"github.com/yudai/gotty/webtty"
+	"gotty/webtty"
 )
 
 // Slave is webtty.Slave with some additional methods.
diff --git a/utils/flags.go b/utils/flags.go
index b5c66b9..48e8821 100644
--- a/utils/flags.go
+++ b/utils/flags.go
@@ -7,11 +7,11 @@ import (
 	"reflect"
 	"strings"
 
-	"github.com/codegangsta/cli"
 	"github.com/fatih/structs"
+	"github.com/urfave/cli"
 	"github.com/yudai/hcl"
 
-	"github.com/yudai/gotty/pkg/homedir"
+	"gotty/pkg/homedir"
 )
 
 func GenerateFlags(options ...interface{}) (flags []cli.Flag, mappings map[string]string, err error) {