diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 790a0784..48ffd2b8 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -48,8 +48,10 @@ jobs:
       run: pip install build flit
     - name: Test with pytest
       run: |
-        coverage run -m pytest -W always
+        coverage run -m pytest
         coverage xml
+      env:
+        PYTHONWARNDEFAULTENCODING: 1
     - name: Send coverage data to Codecov
       uses: codecov/codecov-action@v3
       with:
diff --git a/pyproject.toml b/pyproject.toml
index b58ec6b4..14704f0c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -74,7 +74,15 @@ extend-exclude = '''
 '''
 
 [tool.pytest.ini_options]
-testpaths = "tests"
+minversion = "6.0"
+addopts = ["-ra", "--showlocals", "--strict-markers", "--strict-config"]
+xfail_strict = true
+filterwarnings = [
+    "error",
+    "ignore::Warning:_pytest.*",
+]
+log_cli_level = "info"
+testpaths = ["test"]
 
 [tool.coverage.run]
 source = ["wheel"]
@@ -112,8 +120,10 @@ skip_missing_interpreters = true
 
 [testenv]
 depends = lint
-commands = {envpython} -b -m pytest -W always {posargs}
+commands = {envpython} -b -m pytest {posargs}
 extras = test
+set_env =
+  PYTHONWARNDEFAULTENCODING = 1
 
 [testenv:lint]
 depends =
diff --git a/src/wheel/bdist_wheel.py b/src/wheel/bdist_wheel.py
index c059ddc2..28a9050b 100644
--- a/src/wheel/bdist_wheel.py
+++ b/src/wheel/bdist_wheel.py
@@ -547,7 +547,7 @@ def adios(p):
 
             # delete dependency_links if it is only whitespace
             dependency_links_path = os.path.join(distinfo_path, "dependency_links.txt")
-            with open(dependency_links_path) as dependency_links_file:
+            with open(dependency_links_path, encoding="utf-8") as dependency_links_file:
                 dependency_links = dependency_links_file.read().strip()
             if not dependency_links:
                 adios(dependency_links_path)
diff --git a/src/wheel/metadata.py b/src/wheel/metadata.py
index 61c0e4e3..b391c962 100644
--- a/src/wheel/metadata.py
+++ b/src/wheel/metadata.py
@@ -152,7 +152,7 @@ def pkginfo_to_metadata(egg_info_path: str, pkginfo_path: str) -> Message:
     del pkg_info["Requires-Dist"]
     requires_path = os.path.join(egg_info_path, "requires.txt")
     if os.path.exists(requires_path):
-        with open(requires_path) as requires_file:
+        with open(requires_path, encoding="utf-8") as requires_file:
             requires = requires_file.read()
 
         parsed_requirements = sorted(split_sections(requires), key=lambda x: x[0] or "")
diff --git a/tests/cli/test_convert.py b/tests/cli/test_convert.py
index 87ca6f6e..4f26b237 100644
--- a/tests/cli/test_convert.py
+++ b/tests/cli/test_convert.py
@@ -10,7 +10,7 @@
 def test_egg_re():
     """Make sure egg_info_re matches."""
     egg_names_path = os.path.join(os.path.dirname(__file__), "eggnames.txt")
-    with open(egg_names_path) as egg_names:
+    with open(egg_names_path, encoding="utf-8") as egg_names:
         for line in egg_names:
             line = line.strip()
             if line: