diff --git a/cmd/evening_detective_server/main.go b/cmd/evening_detective_server/main.go
index df902ce..f6b5b71 100644
--- a/cmd/evening_detective_server/main.go
+++ b/cmd/evening_detective_server/main.go
@@ -294,7 +294,9 @@ func main() {
 	mainMux.Handle("/docs/", docsHandler)
 	mainMux.HandleFunc("/swagger/doc.json", func(w http.ResponseWriter, r *http.Request) {
 		w.Header().Set("Content-Type", "application/json")
-		w.Write(swaggerJSON)
+		if _, err := w.Write(swaggerJSON); err != nil {
+			log.Printf("write swagger document: %v", err)
+		}
 	})
 	// MaxBytesReader на HTTP-слое: gateway буферизует тело целиком, без лимита
 	// проверки в хендлере не спасут от OOM. Лимиты по маршрутам: файлы —
diff --git a/internal/modules/email_sender/sender.go b/internal/modules/email_sender/sender.go
index 5f4d48a..ac6f8f9 100644
--- a/internal/modules/email_sender/sender.go
+++ b/internal/modules/email_sender/sender.go
@@ -76,7 +76,7 @@ func (s *sender) Send(ctx context.Context, message Message) error {
 	if err != nil {
 		return fmt.Errorf("email: smtp dial %s: %w", addr, err)
 	}
-	defer rawConn.Close()
+	defer func() { _ = rawConn.Close() }()
 
 	conn := tls.Client(rawConn, s.tlsConfig)
 	if deadline, ok := ctx.Deadline(); ok {
diff --git a/internal/modules/scenario_archive/archive.go b/internal/modules/scenario_archive/archive.go
index 0fd72ec..73df55c 100644
--- a/internal/modules/scenario_archive/archive.go
+++ b/internal/modules/scenario_archive/archive.go
@@ -261,7 +261,9 @@ func (a *scenarioArchive) Unpack(data []byte) (*Bundle, error) {
 			return nil, fmt.Errorf("не удалось открыть запись %q: %w", name, err)
 		}
 		content, err := readEntry(rc)
-		rc.Close()
+		if closeErr := rc.Close(); err == nil {
+			err = closeErr
+		}
 		if err != nil {
 			return nil, fmt.Errorf("запись %q: %w", name, err)
 		}
diff --git a/internal/repos/tickets_repo/repo.go b/internal/repos/tickets_repo/repo.go
index 73237b1..0cbf901 100644
--- a/internal/repos/tickets_repo/repo.go
+++ b/internal/repos/tickets_repo/repo.go
@@ -39,7 +39,7 @@ func (r *Repo) CreateBatch(ctx context.Context, gameID int, tokenHashes [][]byte
 	if err != nil {
 		return nil, err
 	}
-	defer tx.Rollback(ctx)
+	defer func() { _ = tx.Rollback(ctx) }()
 
 	ids := make([]int, 0, len(tokenHashes))
 	for _, tokenHash := range tokenHashes {
diff --git a/internal/services/participation_service/service.go b/internal/services/participation_service/service.go
index 2a023a1..77ad51a 100644
--- a/internal/services/participation_service/service.go
+++ b/internal/services/participation_service/service.go
@@ -58,7 +58,7 @@ func mapParticipationError(err error) error {
 // рабочими процессами и перезапусками.
 func participationToken(secret string, id int) string {
 	mac := hmac.New(sha256.New, []byte(secret))
-	fmt.Fprintf(mac, "team-participation:v1:%d", id)
+	_, _ = fmt.Fprintf(mac, "team-participation:v1:%d", id)
 	return hex.EncodeToString(mac.Sum(nil))
 }