diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 102888d..6b1fc3d 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -24,7 +24,7 @@ jobs:
         shell: bash -l {0}
     steps:
     - uses: actions/checkout@v2
-    - uses: conda-incubator/setup-miniconda@v2
+    - uses: conda-incubator/setup-miniconda@v3
       with:
         mamba-version: "*"
         channels: conda-forge
@@ -58,7 +58,7 @@ jobs:
     name: Build and publish Python distributions to PyPI and TestPyPI
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - uses: conda-incubator/setup-miniconda@v2
       with:
         mamba-version: "*"
diff --git a/cppimport/__init__.py b/cppimport/__init__.py
index 34f91f5..f1bb6fc 100644
--- a/cppimport/__init__.py
+++ b/cppimport/__init__.py
@@ -18,7 +18,7 @@
     force_rebuild=False,  # `force_rebuild` with multiple processes is not supported
     file_exts=[".cpp", ".c"],
     rtld_flags=ctypes.RTLD_LOCAL,
-    use_filelock=True,    # Use filelocking if multiple processes try to build simultaneously 
+    use_filelock=True,  # Filelock if multiple processes try to build simultaneously
     lock_suffix=".lock",
     lock_timeout=10 * 60,
     remove_strict_prototypes=True,
diff --git a/cppimport/build_module.py b/cppimport/build_module.py
index 9585c9b..bec390e 100644
--- a/cppimport/build_module.py
+++ b/cppimport/build_module.py
@@ -98,7 +98,7 @@ def _handle_strict_prototypes():
 
     cfg_vars = distutils.sysconfig.get_config_vars()
     for key, value in cfg_vars.items():
-        if type(value) == str:
+        if value is str:
             cfg_vars[key] = value.replace("-Wstrict-prototypes", "")
 
 
@@ -144,7 +144,6 @@ def _parallel_compile(
     extra_postargs=None,
     depends=None,
 ):
-
     # these lines are copied directly from distutils.ccompiler.CCompiler
     macros, objects, extra_postargs, pp_opts, build = self._setup_compile(
         output_dir, macros, include_dirs, sources, depends, extra_postargs
diff --git a/cppimport/importer.py b/cppimport/importer.py
index cd74953..e5ca91d 100644
--- a/cppimport/importer.py
+++ b/cppimport/importer.py
@@ -43,7 +43,7 @@ def build_completed():
 
     t = time()
 
-    if cppimport.settings['use_filelock']:
+    if cppimport.settings["use_filelock"]:
         # Race to obtain the lock and build. Other processes can wait
         while not build_completed() and time() - t < cppimport.settings["lock_timeout"]:
             try:
diff --git a/tests/conftest.py b/tests/conftest.py
index 05b4d6a..627e092 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,3 +1,8 @@
 def pytest_addoption(parser):
-    parser.addoption('--multiprocessing', action='store_true', dest="multiprocessing",
-                 default=False, help="enable multiprocessing tests with filelock")
\ No newline at end of file
+    parser.addoption(
+        "--multiprocessing",
+        action="store_true",
+        dest="multiprocessing",
+        default=False,
+        help="enable multiprocessing tests with filelock",
+    )
diff --git a/tests/test_cppimport.py b/tests/test_cppimport.py
index 7fad207..a21942d 100644
--- a/tests/test_cppimport.py
+++ b/tests/test_cppimport.py
@@ -5,17 +5,17 @@
 import shutil
 import subprocess
 import sys
-import pytest
 from multiprocessing import Process
 from tempfile import TemporaryDirectory
 
+import pytest
+
 import cppimport
 import cppimport.build_module
 import cppimport.templating
 from cppimport.find import find_module_cpppath
 
-cppimport.settings["use_filelock"] = False  # No need for filelock except for
-                                            # multiprocessing test.
+cppimport.settings["use_filelock"] = False  # Filelock only enabled for multiprocessing
 multiprocessing_enable = pytest.mark.skipif("not config.getoption('multiprocessing')")
 
 root_logger = logging.getLogger()
@@ -27,6 +27,7 @@
 handler.setFormatter(formatter)
 root_logger.addHandler(handler)
 
+
 @contextlib.contextmanager
 def appended(filename, text):
     with open(filename, "r") as f:
@@ -131,8 +132,8 @@ def test_with_file_in_syspath():
 def test_rebuild_after_failed_compile():
     cppimport.imp("mymodule")
     test_code = """
-import cppimport; 
-cppimport.settings["use_filelock"] = False; 
+import cppimport;
+cppimport.settings["use_filelock"] = False;
 mymodule = cppimport.imp("mymodule");
 assert(mymodule.add(1,2) == 3)
     """
@@ -156,7 +157,7 @@ def test_no_rebuild_if_no_deps_change():
     cppimport.imp("mymodule")
     test_code = """
 import cppimport;
-cppimport.settings["use_filelock"] = False; 
+cppimport.settings["use_filelock"] = False;
 mymodule = cppimport.imp("mymodule");
 assert(not hasattr(mymodule, 'Thing'))
 """
@@ -168,7 +169,7 @@ def test_rebuild_header_after_change():
     cppimport.imp("mymodule")
     test_code = """
 import cppimport;
-cppimport.settings["use_filelock"] = False; 
+cppimport.settings["use_filelock"] = False;
 mymodule = cppimport.imp("mymodule");
 mymodule.Thing().cheer()
 """
@@ -223,12 +224,13 @@ def test_relative_import():
     print(f())
     assert f() == 3
 
+
 @multiprocessing_enable
 def test_multiple_processes():
-    '''
+    """
     Only runs if the flag --multiprocessing is passed to
-    pytest. This function requires file locking enabled. 
-    '''
+    pytest. This function requires file locking enabled.
+    """
     with tmp_dir(["tests/hook_test.cpp"]) as tmp_path:
         test_code = f"""
 import os;