diff --git a/.github/workflows/test_and_build.yml b/.github/workflows/test_and_build.yml
index 807123889..7bb55cf83 100644
--- a/.github/workflows/test_and_build.yml
+++ b/.github/workflows/test_and_build.yml
@@ -145,22 +145,22 @@ jobs:
           sparsever=$(python -c 'import random ; print(random.choice(["=0.12", "=0.13", "=0.14", ""]))')
           fmmver=$(python -c 'import random ; print(random.choice(["=1.4", ""]))')
           if [[ ${{ steps.pyver.outputs.selected }} == "3.8" ]]; then
-            npver=$(python -c 'import random ; print(random.choice(["=1.21", "=1.22", "=1.23", ""]))')
+            npver=$(python -c 'import random ; print(random.choice(["=1.21", "=1.22", "=1.23", "=1.24", ""]))')
             spver=$(python -c 'import random ; print(random.choice(["=1.8", "=1.9", "=1.10", ""]))')
             pdver=$(python -c 'import random ; print(random.choice(["=1.2", "=1.3", "=1.4", "=1.5", ""]))')
             akver=$(python -c 'import random ; print(random.choice(["=1.9", "=1.10", "=2.0", "=2.1", ""]))')
           elif [[ ${{ steps.pyver.outputs.selected }} == "3.9" ]]; then
-            npver=$(python -c 'import random ; print(random.choice(["=1.21", "=1.22", "=1.23", ""]))')
+            npver=$(python -c 'import random ; print(random.choice(["=1.21", "=1.22", "=1.23", "=1.24", ""]))')
             spver=$(python -c 'import random ; print(random.choice(["=1.8", "=1.9", "=1.10", ""]))')
             pdver=$(python -c 'import random ; print(random.choice(["=1.2", "=1.3", "=1.4", "=1.5", ""]))')
             akver=$(python -c 'import random ; print(random.choice(["=1.9", "=1.10", "=2.0", "=2.1", ""]))')
           elif [[ ${{ steps.pyver.outputs.selected }} == "3.10" ]]; then
-            npver=$(python -c 'import random ; print(random.choice(["=1.21", "=1.22", "=1.23", ""]))')
+            npver=$(python -c 'import random ; print(random.choice(["=1.21", "=1.22", "=1.23", "=1.24", ""]))')
             spver=$(python -c 'import random ; print(random.choice(["=1.8", "=1.9", "=1.10", ""]))')
             pdver=$(python -c 'import random ; print(random.choice(["=1.3", "=1.4", "=1.5", ""]))')
             akver=$(python -c 'import random ; print(random.choice(["=1.9", "=1.10", "=2.0", "=2.1", ""]))')
           else  # Python 3.11
-            npver=$(python -c 'import random ; print(random.choice(["=1.23", ""]))')
+            npver=$(python -c 'import random ; print(random.choice(["=1.23", "=1.24", ""]))')
             spver=$(python -c 'import random ; print(random.choice(["=1.9", "=1.10", ""]))')
             pdver=$(python -c 'import random ; print(random.choice(["=1.5", ""]))')
             akver=$(python -c 'import random ; print(random.choice(["=1.10", "=2.0", "=2.1", ""]))')
@@ -181,14 +181,17 @@ jobs:
             psgver=""
           fi
           if [[ $npver == "=1.21" ]] ; then
-            numbaver=$(python -c 'import random ; print(random.choice(["=0.55", "=0.56", ""]))')
+            numbaver=$(python -c 'import random ; print(random.choice(["=0.55", "=0.56", "=0.57", ""]))')
+          elif [[ $npver == "=1.24" ]] ; then
+            numbaver="=0.57"
           else
-            numbaver=$(python -c 'import random ; print(random.choice(["=0.56", ""]))')
+            numbaver=$(python -c 'import random ; print(random.choice(["=0.56", "=0.57", ""]))')
           fi
+          numbaver="=0.57"  # XXX: override
           echo "versions: np${npver} sp${spver} pd${pdver} ak${akver} nx${nxver} numba${numbaver} yaml${yamlver} sparse${sparsever} psgver${psgver}"
 
           # Once we have wheels for all OSes, we can delete the last two lines.
-          mamba install packaging pytest coverage coveralls=3.3.1 pytest-randomly cffi donfig tomli pyyaml${yamlver} sparse${sparsever} \
+          mamba install -c numba/label/ci packaging pytest coverage coveralls=3.3.1 pytest-randomly cffi donfig tomli pyyaml${yamlver} sparse${sparsever} \
             pandas${pdver} scipy${spver} numpy${npver} awkward${akver} networkx${nxver} numba${numbaver} fast_matrix_market${fmmver} \
             ${{ matrix.slowtask == 'pytest_bizarro' && 'black' || '' }} \
             ${{ matrix.slowtask == 'notebooks' && 'matplotlib nbconvert jupyter "ipython>=7"' || '' }} \
diff --git a/graphblas/tests/test_numpyops.py b/graphblas/tests/test_numpyops.py
index c528d4051..5b7e797f3 100644
--- a/graphblas/tests/test_numpyops.py
+++ b/graphblas/tests/test_numpyops.py
@@ -168,7 +168,10 @@ def test_npbinary():
                         compare_op = isclose
                     else:
                         np_result = getattr(np, binary_name)(np_left, np_right)
-                        compare_op = npbinary.equal
+                        if binary_name in {"arctan2"}:
+                            compare_op = isclose
+                        else:
+                            compare_op = npbinary.equal
                 except Exception:  # pragma: no cover (debug)
                     print(f"Error computing numpy result for {binary_name}")
                     print(f"dtypes: ({gb_left.dtype}, {gb_right.dtype}) -> {gb_result.dtype}")
@@ -184,11 +187,13 @@ def test_npbinary():
                 match(accum=gb.binary.lor) << gb_result.apply(npunary.isinf)
             compare = match.reduce(gb.monoid.land).new()
             if not compare:  # pragma: no cover (debug)
+                print(compare_op)
                 print(binary_name)
                 print(compute(gb_left))
                 print(compute(gb_right))
                 print(compute(gb_result))
                 print(np_result)
+                print((np_result - compute(gb_result)).new().to_coo()[1])
             assert compare
 
 
diff --git a/pyproject.toml b/pyproject.toml
index 47cf1e67f..5f001e7a4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,6 +47,7 @@ classifiers = [
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3 :: Only",
     "Intended Audience :: Developers",
     "Intended Audience :: Other Audience",