diff --git a/nibabel/gifti/tests/test_parse_gifti_fast.py b/nibabel/gifti/tests/test_parse_gifti_fast.py
index 8cb7c9679..6ca54df03 100644
--- a/nibabel/gifti/tests/test_parse_gifti_fast.py
+++ b/nibabel/gifti/tests/test_parse_gifti_fast.py
@@ -241,7 +241,7 @@ def test_load_dataarray1():
         me = img.darrays[0].meta
         assert 'AnatomicalStructurePrimary' in me
         assert 'AnatomicalStructureSecondary' in me
-        me['AnatomicalStructurePrimary'] == 'CortexLeft'
+        assert me['AnatomicalStructurePrimary'] == 'CortexLeft'
         assert_array_almost_equal(img.darrays[0].coordsys.xform, np.eye(4, 4))
         assert xform_codes.niistring[img.darrays[0].coordsys.dataspace] == 'NIFTI_XFORM_TALAIRACH'
         assert xform_codes.niistring[img.darrays[0].coordsys.xformspace] == 'NIFTI_XFORM_TALAIRACH'
@@ -279,7 +279,7 @@ def test_load_dataarray4():
 def test_dataarray5():
     img5 = load(DATA_FILE5)
     for da in img5.darrays:
-        gifti_endian_codes.byteorder[da.endian] == 'little'
+        assert gifti_endian_codes.byteorder[da.endian] == 'little'
     assert_array_almost_equal(img5.darrays[0].data, DATA_FILE5_darr1)
     assert_array_almost_equal(img5.darrays[1].data, DATA_FILE5_darr2)
     # Round trip tested below
diff --git a/nibabel/tests/conftest.py b/nibabel/tests/conftest.py
index 3cf54a34c..fb1370845 100644
--- a/nibabel/tests/conftest.py
+++ b/nibabel/tests/conftest.py
@@ -6,7 +6,7 @@
 # Generate dynamic fixtures
 def pytest_generate_tests(metafunc):
     if 'supported_dtype' in metafunc.fixturenames:
-        if metafunc.cls is None or not getattr(metafunc.cls, 'image_class'):
+        if metafunc.cls is None or not metafunc.cls.image_class:
             raise pytest.UsageError(
                 'Attempting to use supported_dtype fixture outside an image test case'
             )
diff --git a/nibabel/tests/test_openers.py b/nibabel/tests/test_openers.py
index 15290d5ef..0b5879433 100644
--- a/nibabel/tests/test_openers.py
+++ b/nibabel/tests/test_openers.py
@@ -431,17 +431,17 @@ def test_DeterministicGzipFile_fileobj():
         with open('test.gz', 'wb') as fobj:
             with DeterministicGzipFile(filename='', mode='wb', fileobj=fobj) as gzobj:
                 gzobj.write(msg)
-        md5sum('test.gz') == ref_chksum
+        assert md5sum('test.gz') == ref_chksum
 
         with open('test.gz', 'wb') as fobj:
             with DeterministicGzipFile(fileobj=fobj, mode='wb') as gzobj:
                 gzobj.write(msg)
-        md5sum('test.gz') == ref_chksum
+        assert md5sum('test.gz') == ref_chksum
 
         with open('test.gz', 'wb') as fobj:
             with DeterministicGzipFile(filename='test.gz', mode='wb', fileobj=fobj) as gzobj:
                 gzobj.write(msg)
-        md5sum('test.gz') == ref_chksum
+        assert md5sum('test.gz') == ref_chksum
 
 
 def test_bitwise_determinism():
diff --git a/nibabel/viewers.py b/nibabel/viewers.py
index 0dc2f0daf..4dd8a1c25 100644
--- a/nibabel/viewers.py
+++ b/nibabel/viewers.py
@@ -447,7 +447,7 @@ def _set_position(self, x, y, z, notify=True):
     # Matplotlib handlers ####################################################
     def _in_axis(self, event):
         """Return axis index if within one of our axes, else None"""
-        if getattr(event, 'inaxes') is None:
+        if event.inaxes is None:
             return None
         for ii, ax in enumerate(self._axes):
             if event.inaxes is ax:
diff --git a/pyproject.toml b/pyproject.toml
index 2840119c4..ead2782b2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -116,12 +116,23 @@ exclude = ["doc", "nibabel/externals", "tools", "version.py", "versioneer.py"]
 
 [tool.ruff.lint]
 select = [
+    "B",
     "F",
     "I",
     "Q",
     "UP",
 ]
 ignore = [
+    "B006",  # TODO: enable
+    "B008",  # TODO: enable
+    "B007",
+    "B011",
+    "B017",  # TODO: enable
+    "B018",
+    "B020",
+    "B023",  # TODO: enable
+    "B028",
+    "B904",
     # https://docs.astral.sh/ruff/formatter/#conflicting-lint-rules
     "W191",
     "E111",