diff --git a/os_api_ref/tests/test_basic_example.py b/os_api_ref/tests/test_basic_example.py
index d746100..48af559 100644
--- a/os_api_ref/tests/test_basic_example.py
+++ b/os_api_ref/tests/test_basic_example.py
@@ -38,7 +38,7 @@ class TestBasicExample(base.TestCase):
         self.status = status
         self.warning = warning
         self.app.build()
-        self.html = (app.outdir / 'index.html').read_text()
+        self.html = (app.outdir / 'index.html').read_text(encoding='utf-8')
         self.soup = BeautifulSoup(self.html, 'html.parser')
         self.content = str(self.soup)
 
diff --git a/os_api_ref/tests/test_microversions.py b/os_api_ref/tests/test_microversions.py
index a18fb24..b58f6a6 100644
--- a/os_api_ref/tests/test_microversions.py
+++ b/os_api_ref/tests/test_microversions.py
@@ -38,7 +38,7 @@ class TestMicroversions(base.TestCase):
         self.app.build()
         self.status = status.getvalue()
         self.warning = warning.getvalue()
-        self.html = (app.outdir / 'index.html').read_text()
+        self.html = (app.outdir / 'index.html').read_text(encoding='utf-8')
         self.soup = BeautifulSoup(self.html, 'html.parser')
         self.content = str(self.soup)
 
diff --git a/os_api_ref/tests/test_warnings.py b/os_api_ref/tests/test_warnings.py
index 7c3a5f2..0b62818 100644
--- a/os_api_ref/tests/test_warnings.py
+++ b/os_api_ref/tests/test_warnings.py
@@ -38,7 +38,7 @@ class TestWarnings(base.TestCase):
         self.app.build()
         self.status = status.getvalue()
         self.warning = warning.getvalue()
-        self.html = (app.outdir / 'index.html').read_text()
+        self.html = (app.outdir / 'index.html').read_text(encoding='utf-8')
         self.soup = BeautifulSoup(self.html, 'html.parser')
         self.content = str(self.soup)