diff --git a/config.go b/config.go
index d94dda5..1ee428a 100644
--- a/config.go
+++ b/config.go
@@ -6,7 +6,7 @@ import (
 	"strings"
 
 	"github.com/Songmu/gitconfig"
-	"github.com/google/go-github/v49/github"
+	"github.com/google/go-github/v57/github"
 )
 
 const (
diff --git a/github.go b/github.go
index cf30676..8f3fdd4 100644
--- a/github.go
+++ b/github.go
@@ -6,7 +6,7 @@ import (
 	"net/url"
 
 	"github.com/Songmu/gitconfig"
-	"github.com/google/go-github/v49/github"
+	"github.com/google/go-github/v57/github"
 	"golang.org/x/oauth2"
 )
 
diff --git a/go.mod b/go.mod
index f60a7ef..2a62ea9 100644
--- a/go.mod
+++ b/go.mod
@@ -1,13 +1,13 @@
 module github.com/Songmu/tagpr
 
-go 1.19
+go 1.21.5
 
 require (
 	github.com/Masterminds/semver/v3 v3.2.1
-	github.com/Songmu/gh2changelog v0.0.4
+	github.com/Songmu/gh2changelog v0.0.5
 	github.com/Songmu/gitconfig v0.2.0
 	github.com/Songmu/gitsemvers v0.0.3
-	github.com/google/go-github/v49 v49.1.0
+	github.com/google/go-github/v57 v57.0.0
 	github.com/saracen/walker v0.1.3
 	golang.org/x/oauth2 v0.15.0
 )
diff --git a/go.sum b/go.sum
index 4ee52bc..8b82def 100644
--- a/go.sum
+++ b/go.sum
@@ -1,11 +1,12 @@
 github.com/MakeNowJust/heredoc v1.0.0/go.mod h1:mG5amYoWBHf8vpLOuehzbGGw0EHxpZZ6lCpQ4fNJ8LE=
 github.com/Masterminds/semver/v3 v3.2.1 h1:RN9w6+7QoMeJVGyfmbcgs28Br8cvmnucEXnY0rYXWg0=
 github.com/Masterminds/semver/v3 v3.2.1/go.mod h1:qvl/7zhW3nngYb5+80sSMF+FG2BjYrf8m9wsX0PNOMQ=
-github.com/Songmu/gh2changelog v0.0.4 h1:j8Vl0mSs46Qiqv4bS2/9bjUuJxg7IzfCuA3WUdliPU8=
-github.com/Songmu/gh2changelog v0.0.4/go.mod h1:WxmumOk8iL3/qXwFKJhTROomHKeevDg9zY+pm3K8HA4=
+github.com/Songmu/gh2changelog v0.0.5 h1:YBLawkHbhRE9bMyl1d0J8RPDL7LFw/rrbk75WbOSTvc=
+github.com/Songmu/gh2changelog v0.0.5/go.mod h1:v7zsZcXH2Y9GiivTDymsRIMUwr4+f+pJ8RvjWhMGThc=
 github.com/Songmu/gitconfig v0.2.0 h1:pX2++u4KUq+K2k/ZCzGXLtkD3ceCqIdi0tDyb+IbSyo=
 github.com/Songmu/gitconfig v0.2.0/go.mod h1:cB5bYJer+pl7W8g6RHFwL/0X6aJROVrYuHlvc7PT+hE=
 github.com/Songmu/gitmock v0.0.2 h1:KF5GTll60LxGskZbt58QDd29y/GYLgdxqvkvnSU6RlY=
+github.com/Songmu/gitmock v0.0.2/go.mod h1:/ILc8CtPydh2MJ8toKCOB1opd2HCaU/6RWJjg7lmSvs=
 github.com/Songmu/gitsemvers v0.0.3 h1:pyNgp4+G0Y65zP+4ANybm/fFUyThaMl3SrUzmh50ogk=
 github.com/Songmu/gitsemvers v0.0.3/go.mod h1:WdKXiC8zjNK1N7CoZ9cM9vrw/Bg6/W4AwGrfTkkUPdM=
 github.com/cli/browser v1.1.0/go.mod h1:HKMQAt9t12kov91Mn7RfZxyJQQgWgyS/3SZswlZ5iTI=
@@ -18,6 +19,7 @@ github.com/cli/safeexec v1.0.1/go.mod h1:Z/D4tTN8Vs5gXYHDCbaM1S/anmEDnJb1iW0+EJ5
 github.com/cli/shurcooL-graphql v0.0.1/go.mod h1:U7gCSuMZP/Qy7kbqkk5PrqXEeDgtfG5K+W+u8weorps=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/fatih/color v1.10.0/go.mod h1:ELkj/draVOlAH/xkhN6mQ50Qd0MPOk5AAr3maGEBuJM=
 github.com/fatih/color v1.13.0/go.mod h1:kLAiJbzzSOZDVNGyDpeOxJ47H46qBXwg5ILebYFFOfk=
 github.com/fatih/color v1.16.0 h1:zmkK9Ngbjj+K0yRhTVONQh1p/HknKYSlNT+vZCzyokM=
@@ -38,9 +40,10 @@ github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg
 github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
 github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
-github.com/google/go-github/v49 v49.1.0 h1:LFkMgawGQ8dfzWLH/rNE0b3u1D3n6/dw7ZmrN3b+YFY=
-github.com/google/go-github/v49 v49.1.0/go.mod h1:MUUzHPrhGniB6vUKa27y37likpipzG+BXXJbG04J334=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/go-github/v57 v57.0.0 h1:L+Y3UPTY8ALM8x+TV0lg+IEBI+upibemtBD8Q9u7zHs=
+github.com/google/go-github/v57 v57.0.0/go.mod h1:s0omdnye0hvK/ecLvpsGfJMiRt85PimQh4oygmLIxHw=
 github.com/google/go-querystring v1.1.0 h1:AnCroh3fv4ZBgVIf1Iwtovgjaw/GiKJo8M8yD/fhyJ8=
 github.com/google/go-querystring v1.1.0/go.mod h1:Kcdr2DB4koayq7X8pmAG4sNG59So17icRSOU623lUBU=
 github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510/go.mod h1:pupxD2MaaD3pAXIBCelhxNneeOaAeabZDe5s4K6zSpQ=
diff --git a/tag.go b/tag.go
index e8f5938..22b921c 100644
--- a/tag.go
+++ b/tag.go
@@ -4,7 +4,7 @@ import (
 	"context"
 	"strings"
 
-	"github.com/google/go-github/v49/github"
+	"github.com/google/go-github/v57/github"
 )
 
 func (tp *tagpr) latestPullRequest(ctx context.Context) (*github.PullRequest, error) {
diff --git a/tagpr.go b/tagpr.go
index 46bde44..925cd9f 100644
--- a/tagpr.go
+++ b/tagpr.go
@@ -18,7 +18,7 @@ import (
 
 	"github.com/Songmu/gh2changelog"
 	"github.com/Songmu/gitsemvers"
-	"github.com/google/go-github/v49/github"
+	"github.com/google/go-github/v57/github"
 )
 
 const (
diff --git a/tagpr_test.go b/tagpr_test.go
index 207b6f9..ec7e67a 100644
--- a/tagpr_test.go
+++ b/tagpr_test.go
@@ -6,9 +6,8 @@ import (
 	"os"
 	"reflect"
 	"testing"
-	"time"
 
-	"github.com/google/go-github/v49/github"
+	"github.com/google/go-github/v57/github"
 )
 
 func TestBuildChunkSearchIssuesQuery(t *testing.T) {
@@ -276,9 +275,9 @@ func TestGeneratenNextLabels(t *testing.T) {
 					Labels:            tt.labels,
 					Assignee:          &github.User{},
 					Comments:          new(int),
-					ClosedAt:          &time.Time{},
-					CreatedAt:         &time.Time{},
-					UpdatedAt:         &time.Time{},
+					ClosedAt:          &github.Timestamp{},
+					CreatedAt:         &github.Timestamp{},
+					UpdatedAt:         &github.Timestamp{},
 					ClosedBy:          &github.User{},
 					URL:               new(string),
 					HTMLURL:           new(string),