diff --git a/Dockerfile b/Dockerfile
index 74eb9d74..6dfb4f6d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -13,6 +13,7 @@ RUN go mod download
 COPY main.go main.go
 COPY api/ api/
 COPY controllers/ controllers/
+COPY github/ github/
 
 # Build
 RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GO111MODULE=on go build -a -o manager main.go
diff --git a/controllers/runner_controller.go b/controllers/runner_controller.go
index 7904be83..96d4463b 100644
--- a/controllers/runner_controller.go
+++ b/controllers/runner_controller.go
@@ -20,10 +20,8 @@ import (
 	"context"
 	"fmt"
 	"reflect"
-	"time"
 
 	"github.com/go-logr/logr"
-	"github.com/google/go-github/v29/github"
 	"k8s.io/apimachinery/pkg/api/errors"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/client-go/tools/record"
@@ -34,6 +32,7 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 
 	"github.com/summerwind/actions-runner-controller/api/v1alpha1"
+	"github.com/summerwind/actions-runner-controller/github"
 )
 
 const (
@@ -41,23 +40,6 @@ const (
 	finalizerName = "runner.actions.summerwind.dev"
 )
 
-type GitHubRunnerList struct {
-	TotalCount int            `json:"total_count"`
-	Runners    []GitHubRunner `json:"runners,omitempty"`
-}
-
-type GitHubRunner struct {
-	ID     int    `json:"id"`
-	Name   string `json:"name"`
-	OS     string `json:"os"`
-	Status string `json:"status"`
-}
-
-type GitHubRegistrationToken struct {
-	Token     string `json:"token"`
-	ExpiresAt string `json:"expires_at"`
-}
-
 // RunnerReconciler reconciles a Runner object
 type RunnerReconciler struct {
 	client.Client
@@ -126,7 +108,7 @@ func (r *RunnerReconciler) Reconcile(req ctrl.Request) (ctrl.Result, error) {
 	}
 
 	if !runner.IsRegisterable() {
-		reg, err := r.newRegistration(ctx, runner.Spec.Repository)
+		rt, err := r.GitHubClient.GetRegistrationToken(ctx, runner.Spec.Repository, runner.Name)
 		if err != nil {
 			r.Recorder.Event(&runner, corev1.EventTypeWarning, "FailedUpdateRegistrationToken", "Updating registration token failed")
 			log.Error(err, "Failed to get new registration token")
@@ -134,7 +116,11 @@ func (r *RunnerReconciler) Reconcile(req ctrl.Request) (ctrl.Result, error) {
 		}
 
 		updated := runner.DeepCopy()
-		updated.Status.Registration = reg
+		updated.Status.Registration = v1alpha1.RunnerStatusRegistration{
+			Repository: runner.Spec.Repository,
+			Token:      rt.GetToken(),
+			ExpiresAt:  metav1.NewTime(rt.GetExpiresAt().Time),
+		}
 
 		if err := r.Status().Update(ctx, updated); err != nil {
 			log.Error(err, "Failed to update runner status")
@@ -226,109 +212,31 @@ func (r *RunnerReconciler) Reconcile(req ctrl.Request) (ctrl.Result, error) {
 	return ctrl.Result{}, nil
 }
 
-func (r *RunnerReconciler) newRegistration(ctx context.Context, repo string) (v1alpha1.RunnerStatusRegistration, error) {
-	var reg v1alpha1.RunnerStatusRegistration
-
-	rt, err := r.getRegistrationToken(ctx, repo)
-	if err != nil {
-		return reg, err
-	}
-
-	expiresAt, err := time.Parse(time.RFC3339, rt.ExpiresAt)
-	if err != nil {
-		return reg, err
-	}
-
-	reg.Repository = repo
-	reg.Token = rt.Token
-	reg.ExpiresAt = metav1.NewTime(expiresAt)
-
-	return reg, err
-}
-
-func (r *RunnerReconciler) getRegistrationToken(ctx context.Context, repo string) (GitHubRegistrationToken, error) {
-	var regToken GitHubRegistrationToken
-
-	req, err := r.GitHubClient.NewRequest("POST", fmt.Sprintf("/repos/%s/actions/runners/registration-token", repo), nil)
-	if err != nil {
-		return regToken, err
-	}
-
-	res, err := r.GitHubClient.Do(ctx, req, &regToken)
-	if err != nil {
-		return regToken, err
-	}
-
-	if res.StatusCode != 201 {
-		return regToken, fmt.Errorf("unexpected status: %d", res.StatusCode)
-	}
-
-	return regToken, nil
-}
-
 func (r *RunnerReconciler) unregisterRunner(ctx context.Context, repo, name string) (bool, error) {
-	runners, err := r.listRunners(ctx, repo)
+	runners, err := r.GitHubClient.ListRunners(ctx, repo)
 	if err != nil {
 		return false, err
 	}
 
-	id := 0
-	for _, runner := range runners.Runners {
-		if runner.Name == name {
-			id = runner.ID
+	id := int64(0)
+	for _, runner := range runners {
+		if runner.GetName() == name {
+			id = runner.GetID()
 			break
 		}
 	}
 
-	if id == 0 {
+	if id == int64(0) {
 		return false, nil
 	}
 
-	if err := r.removeRunner(ctx, repo, id); err != nil {
+	if err := r.GitHubClient.RemoveRunner(ctx, repo, id); err != nil {
 		return false, err
 	}
 
 	return true, nil
 }
 
-func (r *RunnerReconciler) listRunners(ctx context.Context, repo string) (GitHubRunnerList, error) {
-	runners := GitHubRunnerList{}
-
-	req, err := r.GitHubClient.NewRequest("GET", fmt.Sprintf("/repos/%s/actions/runners", repo), nil)
-	if err != nil {
-		return runners, err
-	}
-
-	res, err := r.GitHubClient.Do(ctx, req, &runners)
-	if err != nil {
-		return runners, err
-	}
-
-	if res.StatusCode != 200 {
-		return runners, fmt.Errorf("unexpected status: %d", res.StatusCode)
-	}
-
-	return runners, nil
-}
-
-func (r *RunnerReconciler) removeRunner(ctx context.Context, repo string, id int) error {
-	req, err := r.GitHubClient.NewRequest("DELETE", fmt.Sprintf("/repos/%s/actions/runners/%d", repo, id), nil)
-	if err != nil {
-		return err
-	}
-
-	res, err := r.GitHubClient.Do(ctx, req, nil)
-	if err != nil {
-		return err
-	}
-
-	if res.StatusCode != 204 {
-		return fmt.Errorf("unexpected status: %d", res.StatusCode)
-	}
-
-	return nil
-}
-
 func (r *RunnerReconciler) newPod(runner v1alpha1.Runner) (corev1.Pod, error) {
 	var (
 		privileged bool  = true
diff --git a/github/fake/fake.go b/github/fake/fake.go
new file mode 100644
index 00000000..a9ed3667
--- /dev/null
+++ b/github/fake/fake.go
@@ -0,0 +1,86 @@
+package fake
+
+import (
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"time"
+)
+
+const (
+	RegistrationToken = "fake-registration-token"
+
+	RunnersListBody = `
+{
+  "total_count": 2,
+  "runners": [
+    {"id": 1, "name": "test1", "os": "linux", "status": "online"},
+    {"id": 2, "name": "test2", "os": "linux", "status": "offline"}
+  ]
+}
+`
+)
+
+type handler struct {
+	Status int
+	Body   string
+}
+
+func (h *handler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	w.WriteHeader(h.Status)
+	fmt.Fprintf(w, h.Body)
+}
+
+func NewServer() *httptest.Server {
+	routes := map[string]handler{
+		// For CreateRegistrationToken
+		"/repos/test/valid/actions/runners/registration-token": handler{
+			Status: http.StatusCreated,
+			Body:   fmt.Sprintf("{\"token\": \"%s\", \"expires_at\": \"%s\"}", RegistrationToken, time.Now().Add(time.Hour*1).Format(time.RFC3339)),
+		},
+		"/repos/test/invalid/actions/runners/registration-token": handler{
+			Status: http.StatusOK,
+			Body:   fmt.Sprintf("{\"token\": \"%s\", \"expires_at\": \"%s\"}", RegistrationToken, time.Now().Add(time.Hour*1).Format(time.RFC3339)),
+		},
+		"/repos/test/error/actions/runners/registration-token": handler{
+			Status: http.StatusBadRequest,
+			Body:   "",
+		},
+
+		// For ListRunners
+		"/repos/test/valid/actions/runners": handler{
+			Status: http.StatusOK,
+			Body:   RunnersListBody,
+		},
+		"/repos/test/invalid/actions/runners": handler{
+			Status: http.StatusNoContent,
+			Body:   "",
+		},
+		"/repos/test/error/actions/runners": handler{
+			Status: http.StatusBadRequest,
+			Body:   "",
+		},
+
+		// For RemoveRunner
+		"/repos/test/valid/actions/runners/1": handler{
+			Status: http.StatusNoContent,
+			Body:   "",
+		},
+		"/repos/test/invalid/actions/runners/1": handler{
+			Status: http.StatusOK,
+			Body:   "",
+		},
+		"/repos/test/error/actions/runners/1": handler{
+			Status: http.StatusBadRequest,
+			Body:   "",
+		},
+	}
+
+	mux := http.NewServeMux()
+	for path, handler := range routes {
+		h := handler
+		mux.Handle(path, &h)
+	}
+
+	return httptest.NewServer(mux)
+}
diff --git a/github/github.go b/github/github.go
new file mode 100644
index 00000000..401eee4f
--- /dev/null
+++ b/github/github.go
@@ -0,0 +1,147 @@
+package github
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net/http"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/bradleyfalzon/ghinstallation"
+	"github.com/google/go-github/v31/github"
+	"golang.org/x/oauth2"
+)
+
+type Client struct {
+	*github.Client
+	regTokens map[string]*github.RegistrationToken
+	mu        sync.Mutex
+}
+
+// NewClient returns a client authenticated as a GitHub App.
+func NewClient(appID, installationID int64, privateKeyPath string) (*Client, error) {
+	tr, err := ghinstallation.NewKeyFromFile(http.DefaultTransport, appID, installationID, privateKeyPath)
+	if err != nil {
+		return nil, fmt.Errorf("authentication failed: %v", err)
+	}
+
+	return &Client{
+		Client:    github.NewClient(&http.Client{Transport: tr}),
+		regTokens: map[string]*github.RegistrationToken{},
+		mu:        sync.Mutex{},
+	}, nil
+}
+
+// NewClient returns a client authenticated with personal access token.
+func NewClientWithAccessToken(token string) (*Client, error) {
+	tc := oauth2.NewClient(context.Background(), oauth2.StaticTokenSource(
+		&oauth2.Token{AccessToken: token},
+	))
+
+	return &Client{
+		Client:    github.NewClient(tc),
+		regTokens: map[string]*github.RegistrationToken{},
+		mu:        sync.Mutex{},
+	}, nil
+}
+
+// GetRegistrationToken returns a registration token tied with the name of repository and runner.
+func (c *Client) GetRegistrationToken(ctx context.Context, repository, name string) (*github.RegistrationToken, error) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	owner, repo, err := splitOwnerAndRepo(repository)
+	if err != nil {
+		return nil, err
+	}
+
+	key := fmt.Sprintf("%s/%s", repo, name)
+	rt, ok := c.regTokens[key]
+	if ok && rt.GetExpiresAt().After(time.Now().Add(-10*time.Minute)) {
+		return rt, nil
+	}
+
+	rt, res, err := c.Client.Actions.CreateRegistrationToken(ctx, owner, repo)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create registration token: %v", err)
+	}
+
+	if res.StatusCode != 201 {
+		return nil, fmt.Errorf("unexpected status: %d", res.StatusCode)
+	}
+
+	c.regTokens[key] = rt
+	go func() {
+		c.cleanup()
+	}()
+
+	return rt, nil
+}
+
+// RemoveRunner removes a runner with specified runner ID from repocitory.
+func (c *Client) RemoveRunner(ctx context.Context, repository string, runnerID int64) error {
+	owner, repo, err := splitOwnerAndRepo(repository)
+	if err != nil {
+		return err
+	}
+
+	res, err := c.Client.Actions.RemoveRunner(ctx, owner, repo, runnerID)
+	if err != nil {
+		return fmt.Errorf("failed to remove runner: %v", err)
+	}
+
+	if res.StatusCode != 204 {
+		return fmt.Errorf("unexpected status: %d", res.StatusCode)
+	}
+
+	return nil
+}
+
+// ListRunners returns a list of runners of specified repository name.
+func (c *Client) ListRunners(ctx context.Context, repository string) ([]*github.Runner, error) {
+	var runners []*github.Runner
+
+	owner, repo, err := splitOwnerAndRepo(repository)
+	if err != nil {
+		return runners, err
+	}
+
+	opts := github.ListOptions{PerPage: 10}
+	for {
+		list, res, err := c.Client.Actions.ListRunners(ctx, owner, repo, &opts)
+		if err != nil {
+			return runners, fmt.Errorf("failed to remove runner: %v", err)
+		}
+
+		runners = append(runners, list.Runners...)
+		if res.NextPage == 0 {
+			break
+		}
+		opts.Page = res.NextPage
+	}
+
+	return runners, nil
+}
+
+// cleanup removes expired registration tokens.
+func (c *Client) cleanup() {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	for key, rt := range c.regTokens {
+		if rt.GetExpiresAt().Before(time.Now()) {
+			delete(c.regTokens, key)
+		}
+	}
+}
+
+// splitOwnerAndRepo splits specified repository name to the owner and repo name.
+func splitOwnerAndRepo(repo string) (string, string, error) {
+	chunk := strings.Split(repo, "/")
+	if len(chunk) != 2 {
+		return "", "", errors.New("invalid repository name")
+	}
+	return chunk[0], chunk[1], nil
+}
diff --git a/github/github_test.go b/github/github_test.go
new file mode 100644
index 00000000..bd048efa
--- /dev/null
+++ b/github/github_test.go
@@ -0,0 +1,124 @@
+package github
+
+import (
+	"context"
+	"net/http/httptest"
+	"net/url"
+	"testing"
+	"time"
+
+	"github.com/google/go-github/v31/github"
+	"github.com/summerwind/actions-runner-controller/github/fake"
+)
+
+var server *httptest.Server
+
+func newTestClient() *Client {
+	client, err := NewClientWithAccessToken("token")
+	if err != nil {
+		panic(err)
+	}
+
+	baseURL, err := url.Parse(server.URL + "/")
+	if err != nil {
+		panic(err)
+	}
+	client.Client.BaseURL = baseURL
+
+	return client
+}
+
+func TestMain(m *testing.M) {
+	server = fake.NewServer()
+	defer server.Close()
+	m.Run()
+}
+
+func TestGetRegistrationToken(t *testing.T) {
+	tests := []struct {
+		repo  string
+		token string
+		err   bool
+	}{
+		{repo: "test/valid", token: fake.RegistrationToken, err: false},
+		{repo: "test/invalid", token: "", err: true},
+		{repo: "test/error", token: "", err: true},
+	}
+
+	client := newTestClient()
+	for i, tt := range tests {
+		rt, err := client.GetRegistrationToken(context.Background(), tt.repo, "test")
+		if !tt.err && err != nil {
+			t.Errorf("[%d] unexpected error: %v", i, err)
+		}
+		if tt.token != rt.GetToken() {
+			t.Errorf("[%d] unexpected token: %v", i, rt.GetToken())
+		}
+	}
+}
+
+func TestListRunners(t *testing.T) {
+	tests := []struct {
+		repo   string
+		length int
+		err    bool
+	}{
+		{repo: "test/valid", length: 2, err: false},
+		{repo: "test/invalid", length: 0, err: true},
+		{repo: "test/error", length: 0, err: true},
+	}
+
+	client := newTestClient()
+	for i, tt := range tests {
+		runners, err := client.ListRunners(context.Background(), tt.repo)
+		if !tt.err && err != nil {
+			t.Errorf("[%d] unexpected error: %v", i, err)
+		}
+		if tt.length != len(runners) {
+			t.Errorf("[%d] unexpected runners list: %v", i, runners)
+		}
+	}
+}
+
+func TestRemoveRunner(t *testing.T) {
+	tests := []struct {
+		repo string
+		err  bool
+	}{
+		{repo: "test/valid", err: false},
+		{repo: "test/invalid", err: true},
+		{repo: "test/error", err: true},
+	}
+
+	client := newTestClient()
+	for i, tt := range tests {
+		err := client.RemoveRunner(context.Background(), tt.repo, int64(1))
+		if !tt.err && err != nil {
+			t.Errorf("[%d] unexpected error: %v", i, err)
+		}
+	}
+}
+
+func TestCleanup(t *testing.T) {
+	token := "token"
+
+	client := newTestClient()
+	client.regTokens = map[string]*github.RegistrationToken{
+		"active": &github.RegistrationToken{
+			Token:     &token,
+			ExpiresAt: &github.Timestamp{Time: time.Now().Add(time.Hour * 1)},
+		},
+		"expired": &github.RegistrationToken{
+			Token:     &token,
+			ExpiresAt: &github.Timestamp{Time: time.Now().Add(-time.Hour * 1)},
+		},
+	}
+
+	client.cleanup()
+	if _, ok := client.regTokens["active"]; !ok {
+		t.Errorf("active token was accidentally removed")
+	}
+	if _, ok := client.regTokens["expired"]; ok {
+		t.Errorf("expired token still exists")
+	}
+}
diff --git a/go.mod b/go.mod
index 62843417..342f99a2 100644
--- a/go.mod
+++ b/go.mod
@@ -3,18 +3,14 @@ module github.com/summerwind/actions-runner-controller
 go 1.13
 
 require (
-	github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 // indirect
-	github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d // indirect
 	github.com/bradleyfalzon/ghinstallation v1.1.1
 	github.com/davecgh/go-spew v1.1.1
 	github.com/go-logr/logr v0.1.0
-	github.com/google/go-github v17.0.0+incompatible
-	github.com/google/go-github/v29 v29.0.3
+	github.com/google/go-github/v31 v31.0.0
 	github.com/onsi/ginkgo v1.8.0
 	github.com/onsi/gomega v1.5.0
-	github.com/prometheus/common v0.0.0-20181126121408-4724e9255275
+	github.com/stretchr/testify v1.4.0 // indirect
 	golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45
-	gopkg.in/alecthomas/kingpin.v2 v2.2.6 // indirect
 	k8s.io/api v0.0.0-20190918155943-95b840bb6a1f
 	k8s.io/apimachinery v0.0.0-20190913080033-27d36303b655
 	k8s.io/client-go v0.0.0-20190918160344-1fbdaa4c8d90
diff --git a/go.sum b/go.sum
index 4f99be54..9c79b86d 100644
--- a/go.sum
+++ b/go.sum
@@ -18,10 +18,6 @@ github.com/PuerkitoBio/purell v1.1.0/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbt
 github.com/PuerkitoBio/purell v1.1.1/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
 github.com/PuerkitoBio/urlesc v0.0.0-20160726150825-5bd2802263f2/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
 github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
-github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 h1:JYp7IbQjafoB+tBA3gMyHYHrpOtNuDiK/uB5uXxq5wM=
-github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
-github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d h1:UQZhZ2O0vMHr2cI+DC1Mbh0TJxzA3RcLoMsFw+aXw7E=
-github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
 github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
 github.com/asaskevich/govalidator v0.0.0-20180720115003-f9ffefc3facf/go.mod h1:lB+ZfQJz7igIIfQNfa7Ml4HSf2uFQQRzpGGRXenZAgY=
 github.com/asaskevich/govalidator v0.0.0-20190424111038-f61b66f89f4a/go.mod h1:lB+ZfQJz7igIIfQNfa7Ml4HSf2uFQQRzpGGRXenZAgY=
@@ -120,12 +116,10 @@ github.com/google/go-cmp v0.3.0 h1:crn/baboCvb5fXaQ0IJ1SGTsTVrWpDsCWC8EGETZijY=
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.3.1 h1:Xye71clBPdm5HgqGwUkwhbynsUJZhDbS20FvLhQ2izg=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
-github.com/google/go-github v17.0.0+incompatible h1:N0LgJ1j65A7kfXrZnUDaYCs/Sf4rEjNlfyDHW9dolSY=
-github.com/google/go-github v17.0.0+incompatible/go.mod h1:zLgOLi98H3fifZn+44m+umXrS52loVEgC2AApnigrVQ=
 github.com/google/go-github/v29 v29.0.2 h1:opYN6Wc7DOz7Ku3Oh4l7prmkOMwEcQxpFtxdU8N8Pts=
 github.com/google/go-github/v29 v29.0.2/go.mod h1:CHKiKKPHJ0REzfwc14QMklvtHwCveD0PxlMjLlzAM5E=
-github.com/google/go-github/v29 v29.0.3 h1:IktKCTwU//aFHnpA+2SLIi7Oo9uhAzgsdZNbcAqhgdc=
-github.com/google/go-github/v29 v29.0.3/go.mod h1:CHKiKKPHJ0REzfwc14QMklvtHwCveD0PxlMjLlzAM5E=
+github.com/google/go-github/v31 v31.0.0 h1:JJUxlP9lFK+ziXKimTCprajMApV1ecWD4NB6CCb0plo=
+github.com/google/go-github/v31 v31.0.0/go.mod h1:NQPZol8/1sMoWYGN2yaALIBytu17gAWfhbweiEed3pM=
 github.com/google/go-querystring v1.0.0 h1:Xkwi/a1rcvNg1PPYe5vI8GbeBY/jrVuDX5ASuANWTrk=
 github.com/google/go-querystring v1.0.0/go.mod h1:odCYkC5MyYFN7vkCjXpyrEuKhc/BUO6wN/zVPAxq5ck=
 github.com/google/gofuzz v0.0.0-20161122191042-44d81051d367/go.mod h1:HP5RmnzzSNb993RKQDq4+1A4ia9nllfqcQFTQJedwGI=
@@ -237,6 +231,7 @@ github.com/stretchr/testify v0.0.0-20151208002404-e3a8ff8ce365/go.mod h1:a8OnRci
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
 github.com/tmc/grpc-websocket-proxy v0.0.0-20170815181823-89b8d40f7ca8/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
 github.com/ugorji/go/codec v0.0.0-20181204163529-d75b2dcb6bc8/go.mod h1:VFNgLljTbGfSG7qAOspJ7OScBnGdDN/yBr0sguwnwf0=
@@ -343,8 +338,6 @@ google.golang.org/genproto v0.0.0-20190418145605-e7d98fc518a7/go.mod h1:VzzqZJRn
 google.golang.org/genproto v0.0.0-20190502173448-54afdca5d873/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
-gopkg.in/alecthomas/kingpin.v2 v2.2.6 h1:jMFz6MfLP0/4fUyZle81rXUoxOBFi19VUFKVDOQfozc=
-gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
diff --git a/main.go b/main.go
index d4ba7647..8a58de3d 100644
--- a/main.go
+++ b/main.go
@@ -17,18 +17,14 @@ limitations under the License.
 package main
 
 import (
-	"context"
 	"flag"
 	"fmt"
-	"net/http"
 	"os"
 	"strconv"
 
-	"github.com/bradleyfalzon/ghinstallation"
-	"github.com/google/go-github/v29/github"
 	actionsv1alpha1 "github.com/summerwind/actions-runner-controller/api/v1alpha1"
 	"github.com/summerwind/actions-runner-controller/controllers"
-	"golang.org/x/oauth2"
+	"github.com/summerwind/actions-runner-controller/github"
 	"k8s.io/apimachinery/pkg/runtime"
 	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
 	_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
@@ -56,6 +52,9 @@ func init() {
 
 func main() {
 	var (
+		err      error
+		ghClient *github.Client
+
 		metricsAddr          string
 		enableLeaderElection bool
 
@@ -66,8 +65,6 @@ func main() {
 		ghAppID             int64
 		ghAppInstallationID int64
 		ghAppPrivateKey     string
-
-		ghClient *github.Client
 	)
 
 	flag.StringVar(&metricsAddr, "metrics-addr", ":8080", "The address the metric endpoint binds to.")
@@ -111,17 +108,17 @@ func main() {
 			os.Exit(1)
 		}
 
-		tr, err := ghinstallation.NewKeyFromFile(http.DefaultTransport, ghAppID, ghAppInstallationID, ghAppPrivateKey)
+		ghClient, err = github.NewClient(ghAppID, ghAppInstallationID, ghAppPrivateKey)
 		if err != nil {
-			fmt.Fprintf(os.Stderr, "Error: Invalid GitHub App credentials: %v\n", err)
+			fmt.Fprintf(os.Stderr, "Error: Failed to create GitHub client: %v\n", err)
 			os.Exit(1)
 		}
-		ghClient = github.NewClient(&http.Client{Transport: tr})
 	} else if ghToken != "" {
-		tc := oauth2.NewClient(context.Background(), oauth2.StaticTokenSource(
-			&oauth2.Token{AccessToken: ghToken},
-		))
-		ghClient = github.NewClient(tc)
+		ghClient, err = github.NewClientWithAccessToken(ghToken)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Error: Failed to create GitHub client: %v\n", err)
+			os.Exit(1)
+		}
 	} else {
 		fmt.Fprintln(os.Stderr, "Error: GitHub App credentials or personal access token must be specified.")
 		os.Exit(1)