diff --git a/.github/workflows/test_and_build.yml b/.github/workflows/test_and_build.yml
index bfc17834b..af7525928 100644
--- a/.github/workflows/test_and_build.yml
+++ b/.github/workflows/test_and_build.yml
@@ -217,24 +217,24 @@ jobs:
             fi
           elif [[ ${{ startsWith(steps.pyver.outputs.selected, '3.13') }} == true ]] ; then
             if [[ ${{ steps.sourcetype.outputs.selected}} == "conda-forge" ]] ; then
-              psgver=$(python -c 'import random ; print(random.choice(["=9.3.1.0", ""]))')
+              psgver=$(python -c 'import random ; print(random.choice(["=9.3.1.0", "=9.4.5.0", ""]))')
               psg=python-suitesparse-graphblas${psgver}
             else
-              psgver=$(python -c 'import random ; print(random.choice(["==9.3.1.0", ""]))')
+              psgver=$(python -c 'import random ; print(random.choice(["==9.3.1.0", "==9.4.5.0", ""]))')
             fi
           elif [[ ${{ startsWith(steps.pyver.outputs.selected, '3.12') }} == true ]] ; then
             if [[ ${{ steps.sourcetype.outputs.selected}} == "conda-forge" ]] ; then
               if [[ $npver == =1.* ]] ; then
                 psgver=$(python -c 'import random ; print(random.choice(["=8.2.0.1", "=8.2.1.0"]))')
               else
-                psgver=$(python -c 'import random ; print(random.choice(["=9.3.1.0", ""]))')
+                psgver=$(python -c 'import random ; print(random.choice(["=9.3.1.0", "=9.4.5.0", ""]))')
               fi
               psg=python-suitesparse-graphblas${psgver}
             else
               if [[ $npver == =1.* ]] ; then
                 psgver=$(python -c 'import random ; print(random.choice(["==8.2.0.1", "==8.2.1.0"]))')
               else
-                psgver=$(python -c 'import random ; print(random.choice(["==9.3.1.0", ""]))')
+                psgver=$(python -c 'import random ; print(random.choice(["==9.3.1.0", "==9.4.5.0", ""]))')
               fi
             fi
           # python-suitsparse-graphblas support is the same for Python 3.10 and 3.11
@@ -242,21 +242,21 @@ jobs:
             if [[ $npver == =1.* ]] ; then
               psgver=$(python -c 'import random ; print(random.choice(["=7.4.0", "=7.4.1", "=7.4.2", "=7.4.3.0", "=7.4.3.1", "=7.4.3.2", "=8.0.2.1", "=8.2.0.1", "=8.2.1.0"]))')
             else
-              psgver=$(python -c 'import random ; print(random.choice(["=9.3.1.0", ""]))')
+              psgver=$(python -c 'import random ; print(random.choice(["=9.3.1.0", "=9.4.5.0", ""]))')
             fi
             psg=python-suitesparse-graphblas${psgver}
           elif [[ ${{ steps.sourcetype.outputs.selected}} == "wheel" ]] ; then
             if [[ $npver == =1.* ]] ; then
               psgver=$(python -c 'import random ; print(random.choice(["==7.4.3.2", "==8.0.2.1", "==8.2.0.1", "==8.2.1.0"]))')
             else
-              psgver=$(python -c 'import random ; print(random.choice(["==9.3.1.0", ""]))')
+              psgver=$(python -c 'import random ; print(random.choice(["==9.3.1.0", "==9.4.5.0", ""]))')
             fi
           elif [[ ${{ steps.sourcetype.outputs.selected}} == "source" ]] ; then
             # These should be exact versions
             if [[ $npver == =1.* ]] ; then
               psgver=$(python -c 'import random ; print(random.choice(["==7.4.0.0", "==7.4.1.0", "==7.4.2.0", "==7.4.3.0", "==7.4.3.1", "==7.4.3.2", "==8.0.2.1", "==8.2.0.1", "==8.2.1.0"]))')
             else
-              psgver=$(python -c 'import random ; print(random.choice(["==9.3.1.0", ""]))')
+              psgver=$(python -c 'import random ; print(random.choice(["==9.3.1.0", "==9.4.5.0", ""]))')
             fi
           fi
 
@@ -357,7 +357,7 @@ jobs:
             ${{ matrix.slowtask == 'pytest_bizarro' && 'black' || '' }} \
             ${{ matrix.slowtask == 'notebooks' && 'matplotlib nbconvert jupyter "ipython>=7" drawsvg' || '' }} \
             ${{ steps.sourcetype.outputs.selected == 'upstream' && 'cython' || '' }} \
-            ${{ steps.sourcetype.outputs.selected != 'wheel' && '"graphblas>=7.4,<9.4"' || '' }} \
+            ${{ steps.sourcetype.outputs.selected != 'wheel' && '"graphblas>=7.4,<9.5"' || '' }} \
             ${{ contains(steps.pyver.outputs.selected, 'pypy') && 'pypy' || '' }} \
             ${{ matrix.os == 'windows-latest' && 'cmake' || 'm4' }} \
             # ${{ matrix.os != 'windows-latest' && 'pytest-forked' || '' }}  # to investigate crashes
diff --git a/graphblas/tests/test_dtype.py b/graphblas/tests/test_dtype.py
index e2478fe7b..ecbca707f 100644
--- a/graphblas/tests/test_dtype.py
+++ b/graphblas/tests/test_dtype.py
@@ -9,6 +9,7 @@
 import graphblas as gb
 from graphblas import core, dtypes
 from graphblas.core import lib
+from graphblas.core.utils import _NP2
 from graphblas.dtypes import lookup_dtype
 
 suitesparse = gb.backend == "suitesparse"
@@ -228,6 +229,9 @@ def test_dtype_to_from_string():
             # See NEP 55 about StringDtype "T". Notably, this doesn't work:
             # >>> np.dtype(np.dtype("T").str)
             continue
+        if _NP2 and c == "a":
+            # Data type alias 'a' was deprecated in NumPy 2.0. Use the 'S' alias instead.
+            continue
         try:
             dtype = np.dtype(c)
             types.append(dtype)
diff --git a/scripts/check_versions.sh b/scripts/check_versions.sh
index cd3451905..5aa88e045 100755
--- a/scripts/check_versions.sh
+++ b/scripts/check_versions.sh
@@ -7,7 +7,7 @@ conda search 'flake8-bugbear[channel=conda-forge]>=24.12.12'
 conda search 'flake8-simplify[channel=conda-forge]>=0.21.0'
 conda search 'numpy[channel=conda-forge]>=2.2.3'
 conda search 'pandas[channel=conda-forge]>=2.2.3'
-conda search 'scipy[channel=conda-forge]>=1.15.1'
+conda search 'scipy[channel=conda-forge]>=1.15.2'
 conda search 'networkx[channel=conda-forge]>=3.4.2'
 conda search 'awkward[channel=conda-forge]>=2.7.4'
 conda search 'sparse[channel=conda-forge]>=0.15.5'