diff --git a/.github/workflows/wheels.yml b/.github/workflows/wheels.yml
index e884545..5e82960 100644
--- a/.github/workflows/wheels.yml
+++ b/.github/workflows/wheels.yml
@@ -170,7 +170,7 @@ jobs:
     steps:
       - name: Setup QEMU
         if: ${{ matrix.os == 'ubuntu' }}
-        uses: docker/setup-qemu-action@v2
+        uses: docker/setup-qemu-action@v3
         with:
           platforms: all
       - name: Checkout
@@ -182,7 +182,7 @@ jobs:
         with:
           python-version: "3.x"
       - name: Build wheels
-        uses: pypa/cibuildwheel@v2.14.1
+        uses: pypa/cibuildwheel@v2.16.2
         env:
           CIBW_BUILD: ${{ matrix.build }}
           CIBW_ARCHS: ${{ matrix.arch }}
@@ -237,7 +237,7 @@ jobs:
         run: |
           ls -al dist/
       - name: Publish to PyPI
-        uses: pypa/gh-action-pypi-publish@v1.8.8
+        uses: pypa/gh-action-pypi-publish@v1.8.11
         if: startsWith(github.ref, 'refs/tags/')
         with:
           user: __token__
diff --git a/cytoolz/tests/test_functoolz.py b/cytoolz/tests/test_functoolz.py
index 47484f6..a459dad 100644
--- a/cytoolz/tests/test_functoolz.py
+++ b/cytoolz/tests/test_functoolz.py
@@ -1,4 +1,5 @@
 import inspect
+import sys
 import cytoolz
 from cytoolz.functoolz import (thread_first, thread_last, memoize, curry,
                              compose, compose_left, pipe, complement, do, juxt,
@@ -7,6 +8,12 @@
 from cytoolz.utils import raises
 from functools import partial
 
+IS_PYPY_GE_39 = (
+    sys.implementation.name == "pypy"
+    and sys.version_info.major == 3
+    and sys.version_info.minor >= 9
+)
+
 
 def iseven(x):
     return x % 2 == 0
@@ -253,7 +260,8 @@ def f(x, y):
         return x
 
     g = curry(f)
-    assert g.__doc__ == f.__doc__
+    if not IS_PYPY_GE_39:  # pypy >=3.9 doesn't like __doc__ property
+        assert g.__doc__ == f.__doc__
     assert str(g) == str(f)
     assert f(1, 2) == g(1, 2)
 
@@ -582,14 +590,16 @@ def g(a):
 
     composed = compose(f, g)
     assert composed.__name__ == 'f_of_g'
-    assert composed.__doc__ == 'lambda *args, **kwargs: f(g(*args, **kwargs))'
+    if not IS_PYPY_GE_39:  # pypy >=3.9 doesn't like __doc__ property
+        assert composed.__doc__ == 'lambda *args, **kwargs: f(g(*args, **kwargs))'
 
     # Create an object with no __name__.
     h = object()
 
     composed = compose(f, h)
     assert composed.__name__ == 'Compose'
-    assert composed.__doc__ == 'A composition of functions'
+    if not IS_PYPY_GE_39:  # pypy >=3.9 doesn't like __doc__ property
+        assert composed.__doc__ == 'A composition of functions'
 
     assert repr(composed) == 'Compose({!r}, {!r})'.format(f, h)
 
@@ -760,9 +770,10 @@ def handler(e):
     assert excepting(3) == -1
 
     assert excepting.__name__ == 'idx_excepting_ValueError'
-    assert 'idx docstring' in excepting.__doc__
-    assert 'ValueError' in excepting.__doc__
-    assert 'handler docstring' in excepting.__doc__
+    if not IS_PYPY_GE_39:  # pypy >=3.9 doesn't like __doc__ property
+        assert 'idx docstring' in excepting.__doc__
+        assert 'ValueError' in excepting.__doc__
+        assert 'handler docstring' in excepting.__doc__
 
     def getzero(a):
         """getzero docstring
@@ -776,9 +787,10 @@ def getzero(a):
     assert excepting({0: 1}) == 1
 
     assert excepting.__name__ == 'getzero_excepting_IndexError_or_KeyError'
-    assert 'getzero docstring' in excepting.__doc__
-    assert 'return_none' in excepting.__doc__
-    assert 'Returns None' in excepting.__doc__
+    if not IS_PYPY_GE_39:  # pypy >=3.9 doesn't like __doc__ property
+        assert 'getzero docstring' in excepting.__doc__
+        assert 'return_none' in excepting.__doc__
+        assert 'Returns None' in excepting.__doc__
 
     def raise_(a):
         """A function that raises an instance of the exception type given.
diff --git a/cytoolz/tests/test_itertoolz.py b/cytoolz/tests/test_itertoolz.py
index a9d87e1..2a41487 100644
--- a/cytoolz/tests/test_itertoolz.py
+++ b/cytoolz/tests/test_itertoolz.py
@@ -106,9 +106,34 @@ def test_unique():
 
 
 def test_isiterable():
+    # objects that have a __iter__() or __getitem__() method are iterable
+    # https://docs.python.org/3/library/functions.html#iter
+    class IterIterable:
+        def __iter__(self):
+            return iter(["a", "b", "c"])
+
+    class GetItemIterable:
+        def __getitem__(self, item):
+            return ["a", "b", "c"][item]
+
+    # "if a class sets __iter__() to None, the class is not iterable"
+    # https://docs.python.org/3/reference/datamodel.html#special-method-names
+    class NotIterable:
+        __iter__ = None
+
+    class NotIterableEvenWithGetItem:
+        __iter__ = None
+
+        def __getitem__(self, item):
+            return ["a", "b", "c"][item]
+
     assert isiterable([1, 2, 3]) is True
     assert isiterable('abc') is True
+    assert isiterable(IterIterable()) is True
+    assert isiterable(GetItemIterable()) is True
     assert isiterable(5) is False
+    assert isiterable(NotIterable()) is False
+    assert isiterable(NotIterableEvenWithGetItem()) is False
 
 
 def test_isdistinct():