diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 42a6f1c..6c0ce29 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -25,8 +25,6 @@ jobs:
         check_lint: ['0']
         extra_name: ['']
         include:
-          - python: '2.7'
-            extra_name: ', build only'
           - python: '3.9'
             check_lint: '1'
             extra_name: ', check lint'
diff --git a/ci.sh b/ci.sh
index 0284cdc..d836d17 100755
--- a/ci.sh
+++ b/ci.sh
@@ -13,12 +13,6 @@ python setup.py sdist --formats=zip
 pip uninstall -y cython
 pip install dist/*.zip
 
-if python --version 2>&1 | fgrep -q "Python 2.7"; then
-    # The testsuite doesn't run on 2.7, so do just a basic smoke test.
-    unshare -Urn python -c "from netfilterqueue import NetfilterQueue as NFQ; NFQ()"
-    exit $?
-fi
-
 pip install -Ur test-requirements.txt
 
 if [ "$CHECK_LINT" = "1" ]; then
diff --git a/setup.py b/setup.py
index 33d23f7..eca1bab 100644
--- a/setup.py
+++ b/setup.py
@@ -20,7 +20,9 @@ except ImportError:
         # We're being run by pip to figure out what we need. Request cython in
         # setup_requires below.
         setup_requires = ["cython"]
-    elif not os.path.exists(os.path.join(os.path.dirname(__file__), "netfilterqueue.c")):
+    elif not os.path.exists(
+        os.path.join(os.path.dirname(__file__), "netfilterqueue.c")
+    ):
         sys.stderr.write(
             "You must have Cython installed (`pip install cython`) to build this "
             "package from source.\nIf you're receiving this error when installing from "
@@ -35,6 +37,7 @@ except ImportError:
 setup(
     ext_modules=ext_modules,
     setup_requires=setup_requires,
+    python_requires=">=3.6",
     name="NetfilterQueue",
     version=VERSION,
     license="MIT",
diff --git a/tests/test_basic.py b/tests/test_basic.py
index 6998afe..ff71479 100644
--- a/tests/test_basic.py
+++ b/tests/test_basic.py
@@ -103,11 +103,15 @@ async def test_errors(harness):
 
 async def test_unretained(harness):
     # Capture packets without retaining -> can't access payload
-    async with harness.capture_packets_to(2, trio.MemorySendChannel.send_nowait) as chan:
+    async with harness.capture_packets_to(
+        2, trio.MemorySendChannel.send_nowait
+    ) as chan:
         await harness.send(2, b"one", b"two")
         accept = True
         async for p in chan:
-            with pytest.raises(RuntimeError, match="Payload data is no longer available"):
+            with pytest.raises(
+                RuntimeError, match="Payload data is no longer available"
+            ):
                 p.get_payload()
             # Can still issue verdicts though
             if accept:
@@ -166,7 +170,7 @@ async def test_cb_exception_during_unbind(harness, capsys):
 
         @contextmanager
         def catch_unraisable_exception():
-            pass
+            yield
 
     with catch_unraisable_exception() as unraise, trio.CancelScope() as cscope:
         async with harness.capture_packets_to(2, cb):
@@ -188,7 +192,9 @@ async def test_cb_exception_during_unbind(harness, capsys):
             assert str(unraise.unraisable.exc_value) == "test"
 
     if not unraise:
-        assert "Exception ignored in: 'netfilterqueue callback" in capsys.readouterr().err
+        assert (
+            "Exception ignored in: 'netfilterqueue callback" in capsys.readouterr().err
+        )
 
     with pytest.raises(RuntimeError, match="Payload data is no longer available"):
         pkt.get_payload()