diff --git a/docs/conf.py b/docs/conf.py
index aa897ef..62b5202 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -50,8 +50,8 @@
 # built documents.
 #
 # The full version, including alpha/beta/rc tags.
-init_py = open(os.path.join(os.path.dirname(__file__),
-                            '..', 'cssselect', '__init__.py')).read()
+with open(os.path.join(os.path.dirname(__file__), '..', 'cssselect', '__init__.py')) as init_file:
+    init_py = init_file.read()
 release = re.search("VERSION = '([^']+)'", init_py).group(1)
 # The short X.Y version.
 version = release.rstrip('dev')
diff --git a/setup.py b/setup.py
index bddda2e..3a0bea0 100644
--- a/setup.py
+++ b/setup.py
@@ -14,8 +14,10 @@
 
 
 ROOT = os.path.dirname(__file__)
-README = open(os.path.join(ROOT, "README.rst")).read()
-INIT_PY = open(os.path.join(ROOT, "cssselect", "__init__.py")).read()
+with open(os.path.join(ROOT, "README.rst")) as readme_file:
+    README = readme_file.read()
+with open(os.path.join(ROOT, "cssselect", "__init__.py")) as init_file:
+    INIT_PY = init_file.read()
 VERSION = re.search("VERSION = '([^']+)'", INIT_PY).group(1)
 
 
diff --git a/tox.ini b/tox.ini
index f260626..372ecb9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -26,7 +26,7 @@ commands =
 [testenv:pylint]
 deps =
     {[testenv]deps}
-    pylint==2.8.3
+    pylint==2.9.5
 commands =
     pylint {posargs: cssselect setup.py tests docs}