diff --git a/spsvalidator/pyproject.toml b/spsvalidator/pyproject.toml
index f854db9..fd11e6a 100644
--- a/spsvalidator/pyproject.toml
+++ b/spsvalidator/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "spsvalidator"
-version = "0.2.0"
+version = "0.3.0"
 description = "Standalone SPS package validator desktop webapp"
 readme = "README.md"
 requires-python = ">=3.11"
@@ -12,7 +12,7 @@ dependencies = [
   "Flask>=3.0.0",
   "Flask-Babel>=4.0.0",
   "lxml>=5.0.0",
-  "packtools @ git+https://git@github.com/scieloorg/packtools@4.16.7",
+  "packtools @ git+https://git@github.com/scieloorg/packtools@4.16.9",
   "pywebview>=5.1",
   "setuptools>=68,<82",
   "requests>=2.31.0",
diff --git a/spsvalidator/src/spsvalidator/app.py b/spsvalidator/src/spsvalidator/app.py
index 341acaa..b9a2903 100644
--- a/spsvalidator/src/spsvalidator/app.py
+++ b/spsvalidator/src/spsvalidator/app.py
@@ -4,6 +4,7 @@
 
 from flask import Flask, current_app, request
 from flask_babel import Babel, get_locale
+from packtools.sps import i18n as packtools_i18n
 
 from spsvalidator.build_metadata import get_footer_build_label
 from spsvalidator.db.repository import init_db
@@ -11,6 +12,15 @@
 from spsvalidator.web import i18n
 from spsvalidator.web.routes import web_blueprint
 
+# Mapeia os codigos de idioma do spsvalidator (web/i18n.SUPPORTED_LANGUAGES)
+# pros nomes de diretorio de catalogo do packtools (packtools/sps/locale/*).
+# Nota: ate o packtools corrigir scieloorg/packtools#1267 (release nao inclui
+# os .mo compilados quando instalado via git), set_locale() aqui fica sem
+# efeito pratico - as mensagens de validacao continuam em ingles mesmo com o
+# locale certo selecionado. O wiring fica pronto pra quando isso for corrigido
+# no packtools.
+_PACKTOOLS_LOCALE_MAP = {"pt": "pt_BR", "en": "en", "es": "es"}
+
 
 def select_locale():
     if current_app.config["EXECUTION_MODE"] == "desktop":
@@ -39,6 +49,10 @@ def create_app(
 
     Babel(app, locale_selector=select_locale)
 
+    @app.before_request
+    def sync_packtools_locale():
+        packtools_i18n.set_locale(_PACKTOOLS_LOCALE_MAP.get(str(get_locale()), "en"))
+
     @app.context_processor
     def inject_app_info():
         return {
diff --git a/spsvalidator/tests/test_packtools_locale_sync.py b/spsvalidator/tests/test_packtools_locale_sync.py
new file mode 100644
index 0000000..53e7176
--- /dev/null
+++ b/spsvalidator/tests/test_packtools_locale_sync.py
@@ -0,0 +1,44 @@
+import pytest
+
+from spsvalidator import app as app_module
+from spsvalidator.app import create_app
+
+
+@pytest.mark.parametrize(
+    ("accept_language", "expected_packtools_locale"),
+    [
+        ("pt-BR,pt;q=0.9", "pt_BR"),
+        ("en-US,en;q=0.9", "en"),
+        ("es-AR,es;q=0.9", "es"),
+    ],
+)
+def test_before_request_sets_packtools_locale_from_accept_language(
+    tmp_path, monkeypatch, accept_language, expected_packtools_locale
+):
+    calls = []
+    monkeypatch.setattr(app_module.packtools_i18n, "set_locale", calls.append)
+
+    app = create_app(str(tmp_path), execution_mode="browser")
+    app.test_client().get("/", headers={"Accept-Language": accept_language})
+
+    assert calls == [expected_packtools_locale]
+
+
+def test_before_request_sets_packtools_locale_from_system_language(tmp_path, monkeypatch):
+    calls = []
+    monkeypatch.setattr(app_module.packtools_i18n, "set_locale", calls.append)
+
+    app = create_app(str(tmp_path), execution_mode="desktop", system_language="es_AR")
+    app.test_client().get("/", headers={"Accept-Language": "en-US"})
+
+    assert calls == ["es"]
+
+
+def test_unsupported_locale_falls_back_to_packtools_portuguese(tmp_path, monkeypatch):
+    calls = []
+    monkeypatch.setattr(app_module.packtools_i18n, "set_locale", calls.append)
+
+    app = create_app(str(tmp_path), execution_mode="browser")
+    app.test_client().get("/", headers={"Accept-Language": "de-DE"})
+
+    assert calls == ["pt_BR"]
\ No newline at end of file
diff --git a/spsvalidator/tests/test_packtools_validations.py b/spsvalidator/tests/test_packtools_validations.py
index 46e1102..c81edf2 100644
--- a/spsvalidator/tests/test_packtools_validations.py
+++ b/spsvalidator/tests/test_packtools_validations.py
@@ -331,10 +331,10 @@ def test_abstract_sem_lang_reporta_issue(tmp_path):
 
 
 def test_packtools_version():
-    """packtools 4.16.7 deve estar instalada."""
+    """packtools 4.16.9 deve estar instalada."""
     import packtools
 
-    assert packtools.__version__ == "4.16.7"
+    assert packtools.__version__ == "4.16.9"
 
 
 # ---------------------------------------------------------------------------