diff --git a/internal/models/participant.go b/internal/models/participant.go
index a5e8fb3..9960ba7 100644
--- a/internal/models/participant.go
+++ b/internal/models/participant.go
@@ -19,3 +19,7 @@ type ParticipantsListItem struct {
 	CreatedAt time.Time `db:"created_at"`
 	UpdatedAt time.Time `db:"updated_at"`
 }
+
+type ParticipantUpdate struct {
+	Name *string `json:"name"`
+}
diff --git a/internal/tester/delivery.go b/internal/tester/delivery.go
index c2fbb69..f16d4cc 100644
--- a/internal/tester/delivery.go
+++ b/internal/tester/delivery.go
@@ -21,4 +21,5 @@ type Handlers interface {
 	ListParticipants(c *fiber.Ctx, params testerv1.ListParticipantsParams) error
 	UpdateProblem(c *fiber.Ctx, id int32) error
 	UpdateContest(c *fiber.Ctx, id int32) error
+	UpdateParticipant(c *fiber.Ctx, params testerv1.UpdateParticipantParams) error
 }
diff --git a/internal/tester/delivery/rest/handlers.go b/internal/tester/delivery/rest/handlers.go
index 3c13004..1bbcdbc 100644
--- a/internal/tester/delivery/rest/handlers.go
+++ b/internal/tester/delivery/rest/handlers.go
@@ -307,3 +307,20 @@ func (h *TesterHandlers) UpdateContest(c *fiber.Ctx, id int32) error {
 
 	return c.SendStatus(fiber.StatusOK)
 }
+
+func (h *TesterHandlers) UpdateParticipant(c *fiber.Ctx, params testerv1.UpdateParticipantParams) error {
+	var req testerv1.UpdateParticipantRequest
+	err := c.BodyParser(&req)
+	if err != nil {
+		return err
+	}
+
+	err = h.contestsUC.UpdateParticipant(c.Context(), params.ParticipantId, models.ParticipantUpdate{
+		Name: req.Name,
+	})
+	if err != nil {
+		return c.SendStatus(pkg.ToREST(err))
+	}
+
+	return c.SendStatus(fiber.StatusOK)
+}
diff --git a/internal/tester/pg_repository.go b/internal/tester/pg_repository.go
index 77e502f..806185e 100644
--- a/internal/tester/pg_repository.go
+++ b/internal/tester/pg_repository.go
@@ -43,4 +43,5 @@ type ContestRepository interface {
 	ListContests(ctx context.Context, page int32, pageSize int32) ([]*models.ContestsListItem, int32, error)
 	ListParticipants(ctx context.Context, contestId int32, page int32, pageSize int32) ([]*models.ParticipantsListItem, int32, error)
 	UpdateContest(ctx context.Context, id int32, contestUpdate models.ContestUpdate) error
+	UpdateParticipant(ctx context.Context, id int32, participantUpdate models.ParticipantUpdate) error
 }
diff --git a/internal/tester/repository/pg_contests_repository.go b/internal/tester/repository/pg_contests_repository.go
index 96ba888..be6038b 100644
--- a/internal/tester/repository/pg_contests_repository.go
+++ b/internal/tester/repository/pg_contests_repository.go
@@ -228,3 +228,19 @@ func (r *ContestRepository) UpdateContest(ctx context.Context, id int32, contest
 
 	return nil
 }
+
+const (
+	updateParticipantQuery = "UPDATE participants SET name = COALESCE(?, name) WHERE id = ?"
+)
+
+func (r *ContestRepository) UpdateParticipant(ctx context.Context, id int32, participantUpdate models.ParticipantUpdate) error {
+	const op = "ContestRepository.UpdateParticipant"
+
+	query := r.db.Rebind(updateParticipantQuery)
+	_, err := r.db.ExecContext(ctx, query, participantUpdate.Name, id)
+	if err != nil {
+		return handlePgErr(err, op)
+	}
+
+	return nil
+}
diff --git a/internal/tester/usecase.go b/internal/tester/usecase.go
index 3685c70..1c615fe 100644
--- a/internal/tester/usecase.go
+++ b/internal/tester/usecase.go
@@ -25,4 +25,5 @@ type ContestUseCase interface {
 	ListContests(ctx context.Context, page int32, pageSize int32) ([]*models.ContestsListItem, int32, error)
 	ListParticipants(ctx context.Context, contestId int32, page int32, pageSize int32) ([]*models.ParticipantsListItem, int32, error)
 	UpdateContest(ctx context.Context, id int32, contestUpdate models.ContestUpdate) error
+	UpdateParticipant(ctx context.Context, id int32, participantUpdate models.ParticipantUpdate) error
 }
diff --git a/internal/tester/usecase/contests_usecase.go b/internal/tester/usecase/contests_usecase.go
index b901af7..73afd78 100644
--- a/internal/tester/usecase/contests_usecase.go
+++ b/internal/tester/usecase/contests_usecase.go
@@ -61,3 +61,7 @@ func (uc *ContestUseCase) ListParticipants(ctx context.Context, contestId int32,
 func (uc *ContestUseCase) UpdateContest(ctx context.Context, id int32, contestUpdate models.ContestUpdate) error {
 	return uc.contestRepo.UpdateContest(ctx, id, contestUpdate)
 }
+
+func (uc *ContestUseCase) UpdateParticipant(ctx context.Context, id int32, participantUpdate models.ParticipantUpdate) error {
+	return uc.contestRepo.UpdateParticipant(ctx, id, participantUpdate)
+}
diff --git a/proto b/proto
index 9be6a6c..d021cf2 160000
--- a/proto
+++ b/proto
@@ -1 +1 @@
-Subproject commit 9be6a6ca9859e44d4b4502b89c071bc8587491b6
+Subproject commit d021cf202fde8ba13409b9031d01e8b068b82ca9