diff --git a/src/pgpro_pytest_html_merger/__main__.py b/src/pgpro_pytest_html_merger/__main__.py
index 3845497..e146eac 100644
--- a/src/pgpro_pytest_html_merger/__main__.py
+++ b/src/pgpro_pytest_html_merger/__main__.py
@@ -600,7 +600,7 @@ def _process_test(self, test: typing.Dict[str, typing.Any]) -> None:
     def process_report(self, report_path):
         self._report_count += 1
 
-        with open(report_path, "r") as f:
+        with open(report_path, "r", encoding="utf-8") as f:
             soup = bs4.BeautifulSoup(f, features="html.parser")
 
         assert isinstance(soup, bs4.BeautifulSoup)