5 files changed, 8 insertions, 7 deletions
diff --git a/tests/roots/test-ext-autodoc/target/__init__.py b/tests/roots/test-ext-autodoc/target/__init__.py
index 0f8d555e8..908411c22 100644
--- a/tests/roots/test-ext-autodoc/target/__init__.py
+++ b/tests/roots/test-ext-autodoc/target/__init__.py
@@ -1,8 +1,7 @@
 # -*- coding: utf-8 -*-
 
 import enum
-
-from six import StringIO
+from io import StringIO
 
 from sphinx.util import save_traceback  # NOQA
 
diff --git a/tests/roots/test-root/autodoc_target.py b/tests/roots/test-root/autodoc_target.py
index c18e093ee..6aaf9ee16 100644
--- a/tests/roots/test-root/autodoc_target.py
+++ b/tests/roots/test-root/autodoc_target.py
@@ -1,8 +1,7 @@
 # -*- coding: utf-8 -*-
 
 import enum
-
-from six import StringIO
+from io import StringIO
 
 
 __all__ = ['Class']
diff --git a/tests/test_ext_autosummary.py b/tests/test_ext_autosummary.py
index e75fb71fd..069fdb722 100644
--- a/tests/test_ext_autosummary.py
+++ b/tests/test_ext_autosummary.py
@@ -9,8 +9,9 @@
     :license: BSD, see LICENSE for details.
 """
 
+from io import StringIO
+
 import pytest
-from six import StringIO
 
 from sphinx.ext.autosummary import mangle_signature, import_by_name, extract_summary
 from sphinx.testing.util import etree_parse
diff --git a/tests/test_io.py b/tests/test_io.py
index 1c8fee86b..2e81035dc 100644
--- a/tests/test_io.py
+++ b/tests/test_io.py
@@ -9,8 +9,9 @@
     :license: BSD, see LICENSE for details.
 """
 
+from io import StringIO
+
 import pytest
-from six import StringIO
 
 from sphinx.io import SphinxRSTFileInput
 
diff --git a/tests/test_quickstart.py b/tests/test_quickstart.py
index 31533cff0..248b91d64 100644
--- a/tests/test_quickstart.py
+++ b/tests/test_quickstart.py
@@ -11,9 +11,10 @@
 
 import sys
 import time
+from io import StringIO
 
 import pytest
-from six import text_type, StringIO
+from six import text_type
 
 from sphinx import application
 from sphinx.cmd import quickstart as qs