diff --git a/scripts/tests/test_validate_min_versions_in_sync.py b/scripts/tests/test_validate_min_versions_in_sync.py
index b6e339c13889f..523e231423311 100644
--- a/scripts/tests/test_validate_min_versions_in_sync.py
+++ b/scripts/tests/test_validate_min_versions_in_sync.py
@@ -47,7 +47,7 @@
     ],
 )
 def test_pin_min_versions_to_yaml_file(src_toml, src_yaml, expected_yaml) -> None:
-    with open(src_toml, "rb") as toml_f:
+    with open(src_toml, "rb", encoding="utf-8") as toml_f:
         toml_map = tomllib.load(toml_f)
     with open(src_yaml, encoding="utf-8") as yaml_f:
         yaml_file_data = yaml_f.read()
diff --git a/scripts/validate_min_versions_in_sync.py b/scripts/validate_min_versions_in_sync.py
index a45791f6c05cd..17634ff6f42bc 100755
--- a/scripts/validate_min_versions_in_sync.py
+++ b/scripts/validate_min_versions_in_sync.py
@@ -237,7 +237,7 @@ def get_versions_from_toml() -> dict[str, str]:
     """Min versions in pyproject.toml for pip install pandas[extra]."""
     install_map = _optional.INSTALL_MAPPING
     optional_dependencies = {}
-    with open(SETUP_PATH, "rb") as pyproject_f:
+    with open(SETUP_PATH, "rb", encoding="utf-8") as pyproject_f:
         pyproject_toml = tomllib.load(pyproject_f)
         opt_deps = pyproject_toml["project"]["optional-dependencies"]
         dependencies = set(opt_deps["all"])