requests/certs.py      |  8 +++++++-
 setup.py               |  1 -
 tests/test_lowlevel.py | 18 ++++++++++++++++++
 tests/test_requests.py | 10 +++++++++-
 4 files changed, 34 insertions(+), 3 deletions(-)

diff --git a/requests/certs.py b/requests/certs.py
index be422c3e..54c73aaa 100644
--- a/requests/certs.py
+++ b/requests/certs.py
@@ -10,8 +10,14 @@ only one — the one from the certifi package.
 If you are packaging Requests, e.g., for a Linux distribution or a managed
 environment, you can change the definition of where() to return a separately
 packaged CA bundle.
+
+This Fedora-patched package returns "/etc/pki/tls/certs/ca-bundle.crt" provided
+by the ca-certificates RPM package.
 """
-from certifi import where
+def where():
+    """Return the absolute path to the system CA bundle."""
+    return '/etc/pki/tls/certs/ca-bundle.crt'
+
 
 if __name__ == "__main__":
     print(where())
diff --git a/setup.py b/setup.py
index 01235457..ec3fd1d2 100755
--- a/setup.py
+++ b/setup.py
@@ -62,7 +62,6 @@ requires = [
     "charset_normalizer>=2,<4",
     "idna>=2.5,<4",
     "urllib3>=1.21.1,<3",
-    "certifi>=2017.4.17",
 ]
 test_requirements = [
     "pytest-httpbin==2.0.0",
diff --git a/tests/test_lowlevel.py b/tests/test_lowlevel.py
index 859d07e8..808a6b85 100644
--- a/tests/test_lowlevel.py
+++ b/tests/test_lowlevel.py
@@ -286,7 +286,25 @@ for prefix, schemes in _schemes_by_var_prefix:
 _proxy_combos += [(var.upper(), scheme) for var, scheme in _proxy_combos]
 
 
+def has_eventlet():
+    try:
+        import eventlet
+    except ImportError:
+        pass
+    else:
+        return True
+    return False
+
+
 @pytest.mark.parametrize("var,scheme", _proxy_combos)
+@pytest.mark.xfail(
+    has_eventlet(),
+    reason=(
+        "eventlet conflicts with pysocks: "
+        "https://github.com/eventlet/eventlet/issues/616"
+    ),
+    strict=True,
+)
 def test_use_proxy_from_environment(httpbin, var, scheme):
     url = f"{scheme}://httpbin.org"
     fake_proxy = Server()  # do nothing with the requests; just close the socket
diff --git a/tests/test_requests.py b/tests/test_requests.py
index b420c44d..0e962321 100644
--- a/tests/test_requests.py
+++ b/tests/test_requests.py
@@ -985,7 +985,7 @@ class TestRequests:
     )
     def test_env_cert_bundles(self, httpbin, mocker, env, expected):
         s = requests.Session()
-        mocker.patch("os.environ", env)
+        mocker.patch("requests.sessions.os.environ", env)
         settings = s.merge_environment_settings(
             url=httpbin("get"), proxies={}, stream=False, verify=True, cert=None
         )
@@ -2478,6 +2478,10 @@ class TestTimeout:
     @pytest.mark.parametrize(
         "timeout", ((0.1, None), Urllib3Timeout(connect=0.1, read=None))
     )
+    @pytest.mark.skipif(
+        os.environ.get("NO_INTERNET") is not None,
+        reason="Requires configured network",
+    )
     def test_connect_timeout(self, timeout):
         try:
             requests.get(TARPIT, timeout=timeout)
@@ -2489,6 +2493,10 @@ class TestTimeout:
     @pytest.mark.parametrize(
         "timeout", ((0.1, 0.1), Urllib3Timeout(connect=0.1, read=0.1))
     )
+    @pytest.mark.skipif(
+        os.environ.get("NO_INTERNET") is not None,
+        reason="Requires configured network",
+    )
     def test_total_timeout_connect(self, timeout):
         try:
             requests.get(TARPIT, timeout=timeout)