diff --git a/internal/client/repository/http/http_client_test.go b/internal/client/repository/http/http_client_test.go
index 1bbbded..5594d7e 100644
--- a/internal/client/repository/http/http_client_test.go
+++ b/internal/client/repository/http/http_client_test.go
@@ -39,7 +39,7 @@ func TestGet(t *testing.T) {
 	httpClient, _, cleanup := httptest.New(t, testHandler(t, client))
 	t.Cleanup(cleanup)
 
-	result, err := repository.NewHTTPClientRepository(httpClient).Get(context.TODO(), client.ID)
+	result, err := repository.NewHTTPClientRepository(httpClient).Get(context.Background(), client.ID)
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/internal/client/repository/memory/memory_client_test.go b/internal/client/repository/memory/memory_client_test.go
index 9bb8a06..698904e 100644
--- a/internal/client/repository/memory/memory_client_test.go
+++ b/internal/client/repository/memory/memory_client_test.go
@@ -20,7 +20,7 @@ func TestGet(t *testing.T) {
 	store.Store(path.Join(repository.DefaultPathPrefix, client.ID.String()), client)
 
 	result, err := repository.NewMemoryClientRepository(store).
-		Get(context.TODO(), client.ID)
+		Get(context.Background(), client.ID)
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/internal/client/usecase/client_ucase_test.go b/internal/client/usecase/client_ucase_test.go
index 345c664..386fffb 100644
--- a/internal/client/usecase/client_ucase_test.go
+++ b/internal/client/usecase/client_ucase_test.go
@@ -21,7 +21,7 @@ func TestDiscovery(t *testing.T) {
 	store.Store(path.Join(repository.DefaultPathPrefix, client.ID.String()), client)
 
 	result, err := usecase.NewClientUseCase(repository.NewMemoryClientRepository(store)).
-		Discovery(context.TODO(), client.ID)
+		Discovery(context.Background(), client.ID)
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/internal/session/repository/sqlite3/sqlite3_session_test.go b/internal/session/repository/sqlite3/sqlite3_session_test.go
index 72b2d64..b2f2604 100644
--- a/internal/session/repository/sqlite3/sqlite3_session_test.go
+++ b/internal/session/repository/sqlite3/sqlite3_session_test.go
@@ -39,7 +39,7 @@ func TestCreate(t *testing.T) {
 		WillReturnResult(sqlmock.NewResult(1, 1))
 
 	if err := repository.NewSQLite3SessionRepository(db).
-		Create(context.TODO(), session); err != nil {
+		Create(context.Background(), session); err != nil {
 		t.Error(err)
 	}
 }
@@ -69,7 +69,7 @@ func TestGet(t *testing.T) {
 			))
 
 	result, err := repository.NewSQLite3SessionRepository(db).
-		Get(context.TODO(), session.Code)
+		Get(context.Background(), session.Code)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -109,7 +109,7 @@ func TestGetAndDelete(t *testing.T) {
 	mock.ExpectCommit()
 
 	result, err := repository.NewSQLite3SessionRepository(db).
-		GetAndDelete(context.TODO(), session.Code)
+		GetAndDelete(context.Background(), session.Code)
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/internal/ticket/repository/memory/memory_ticket_test.go b/internal/ticket/repository/memory/memory_ticket_test.go
index a2e384b..2f017f0 100644
--- a/internal/ticket/repository/memory/memory_ticket_test.go
+++ b/internal/ticket/repository/memory/memory_ticket_test.go
@@ -19,7 +19,7 @@ func TestCreate(t *testing.T) {
 	ticket := domain.TestTicket(t)
 
 	if err := repository.NewMemoryTicketRepository(store, domain.TestConfig(t)).
-		Create(context.TODO(), ticket); err != nil {
+		Create(context.Background(), ticket); err != nil {
 		t.Fatal(err)
 	}
 
@@ -47,7 +47,7 @@ func TestGetAndDelete(t *testing.T) {
 	})
 
 	result, err := repository.NewMemoryTicketRepository(store, domain.TestConfig(t)).
-		GetAndDelete(context.TODO(), ticket.Ticket)
+		GetAndDelete(context.Background(), ticket.Ticket)
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/internal/ticket/repository/sqlite3/sqlite3_ticket_test.go b/internal/ticket/repository/sqlite3/sqlite3_ticket_test.go
index 2341e2e..3e640a1 100644
--- a/internal/ticket/repository/sqlite3/sqlite3_ticket_test.go
+++ b/internal/ticket/repository/sqlite3/sqlite3_ticket_test.go
@@ -34,7 +34,7 @@ func TestCreate(t *testing.T) {
 		WillReturnResult(sqlmock.NewResult(1, 1))
 
 	if err := repository.NewSQLite3TicketRepository(db, domain.TestConfig(t)).
-		Create(context.TODO(), ticket); err != nil {
+		Create(context.Background(), ticket); err != nil {
 		t.Error(err)
 	}
 }
@@ -64,7 +64,7 @@ func TestGetAndDelete(t *testing.T) {
 	mock.ExpectCommit()
 
 	result, err := repository.NewSQLite3TicketRepository(db, domain.TestConfig(t)).
-		GetAndDelete(context.TODO(), ticket.Ticket)
+		GetAndDelete(context.Background(), ticket.Ticket)
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/internal/ticket/usecase/ticket_ucase_test.go b/internal/ticket/usecase/ticket_ucase_test.go
index 7bf1d0d..61411ed 100644
--- a/internal/ticket/usecase/ticket_ucase_test.go
+++ b/internal/ticket/usecase/ticket_ucase_test.go
@@ -38,7 +38,7 @@ func TestRedeem(t *testing.T) {
 	t.Cleanup(cleanup)
 
 	result, err := ucase.NewTicketUseCase(nil, client, domain.TestConfig(t)).
-		Redeem(context.TODO(), ticket)
+		Redeem(context.Background(), ticket)
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/internal/token/delivery/http/token_http_test.go b/internal/token/delivery/http/token_http_test.go
index 00cc148..f075d7c 100644
--- a/internal/token/delivery/http/token_http_test.go
+++ b/internal/token/delivery/http/token_http_test.go
@@ -122,7 +122,7 @@ func TestRevocation(t *testing.T) {
 		t.Errorf("POST %s = %s, want %s", requestURL, result, expBody)
 	}
 
-	result, err := deps.tokens.Get(context.TODO(), deps.token.AccessToken)
+	result, err := deps.tokens.Get(context.Background(), deps.token.AccessToken)
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/internal/token/repository/memory/memory_token_test.go b/internal/token/repository/memory/memory_token_test.go
index f455706..991f993 100644
--- a/internal/token/repository/memory/memory_token_test.go
+++ b/internal/token/repository/memory/memory_token_test.go
@@ -20,7 +20,7 @@ func TestCreate(t *testing.T) {
 	accessToken := domain.TestToken(t)
 
 	repo := repository.NewMemoryTokenRepository(store)
-	if err := repo.Create(context.TODO(), accessToken); err != nil {
+	if err := repo.Create(context.Background(), accessToken); err != nil {
 		t.Fatal(err)
 	}
 
@@ -28,7 +28,7 @@ func TestCreate(t *testing.T) {
 	assert.True(t, ok)
 	assert.Equal(t, accessToken, result)
 
-	assert.ErrorIs(t, repo.Create(context.TODO(), accessToken), token.ErrExist)
+	assert.ErrorIs(t, repo.Create(context.Background(), accessToken), token.ErrExist)
 }
 
 func TestGet(t *testing.T) {
@@ -39,7 +39,7 @@ func TestGet(t *testing.T) {
 
 	store.Store(path.Join(repository.DefaultPathPrefix, accessToken.AccessToken), accessToken)
 
-	result, err := repository.NewMemoryTokenRepository(store).Get(context.TODO(), accessToken.AccessToken)
+	result, err := repository.NewMemoryTokenRepository(store).Get(context.Background(), accessToken.AccessToken)
 	assert.NoError(t, err)
 	assert.Equal(t, accessToken, result)
 }
diff --git a/internal/token/repository/sqlite3/sqlite3_token_test.go b/internal/token/repository/sqlite3/sqlite3_token_test.go
index da208f7..863eeb9 100644
--- a/internal/token/repository/sqlite3/sqlite3_token_test.go
+++ b/internal/token/repository/sqlite3/sqlite3_token_test.go
@@ -35,7 +35,7 @@ func TestCreate(t *testing.T) {
 		).
 		WillReturnResult(sqlmock.NewResult(1, 1))
 
-	if err := repository.NewSQLite3TokenRepository(db).Create(context.TODO(), token); err != nil {
+	if err := repository.NewSQLite3TokenRepository(db).Create(context.Background(), token); err != nil {
 		t.Error(err)
 	}
 }
@@ -61,7 +61,7 @@ func TestGet(t *testing.T) {
 				model.Scope,
 			))
 
-	result, err := repository.NewSQLite3TokenRepository(db).Get(context.TODO(), token.AccessToken)
+	result, err := repository.NewSQLite3TokenRepository(db).Get(context.Background(), token.AccessToken)
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/internal/user/repository/http/http_user_test.go b/internal/user/repository/http/http_user_test.go
index 91922ce..328e237 100644
--- a/internal/user/repository/http/http_user_test.go
+++ b/internal/user/repository/http/http_user_test.go
@@ -43,7 +43,7 @@ func TestGet(t *testing.T) {
 	client, _, cleanup := httptest.New(t, testHandler(t, user))
 	t.Cleanup(cleanup)
 
-	result, err := repository.NewHTTPUserRepository(client).Get(context.TODO(), user.Me)
+	result, err := repository.NewHTTPUserRepository(client).Get(context.Background(), user.Me)
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/internal/user/repository/memory/memory_user_test.go b/internal/user/repository/memory/memory_user_test.go
index 1183b68..397a464 100644
--- a/internal/user/repository/memory/memory_user_test.go
+++ b/internal/user/repository/memory/memory_user_test.go
@@ -19,7 +19,7 @@ func TestGet(t *testing.T) {
 	store := new(sync.Map)
 	store.Store(path.Join(repository.DefaultPathPrefix, user.Me.String()), user)
 
-	result, err := repository.NewMemoryUserRepository(store).Get(context.TODO(), user.Me)
+	result, err := repository.NewMemoryUserRepository(store).Get(context.Background(), user.Me)
 	if err != nil {
 		t.Error(err)
 	}
diff --git a/internal/user/usecase/user_ucase_test.go b/internal/user/usecase/user_ucase_test.go
index f35f184..836d50c 100644
--- a/internal/user/usecase/user_ucase_test.go
+++ b/internal/user/usecase/user_ucase_test.go
@@ -22,7 +22,7 @@ func TestFetch(t *testing.T) {
 	store.Store(path.Join(repository.DefaultPathPrefix, me.String()), user)
 
 	result, err := ucase.NewUserUseCase(repository.NewMemoryUserRepository(store)).
-		Fetch(context.TODO(), me)
+		Fetch(context.Background(), me)
 	if err != nil {
 		t.Error(err)
 	}