diff --git a/ImageD11/sinograms/lima_segmenter.py b/ImageD11/sinograms/lima_segmenter.py
index 2421f9be..76ec102a 100755
--- a/ImageD11/sinograms/lima_segmenter.py
+++ b/ImageD11/sinograms/lima_segmenter.py
@@ -447,8 +447,8 @@ def sbatchlocal(fname, cores=None):
     for line in lines:
         if line.find('--array=')>=0:
             start, end = line.split('=')[-1].split('-')
-    commands = [ f'SLURM_ARRAY_TASK_ID={i} bash {fname} > {fname}_{i}.log' for 
-                i in range(int(start), int(end)) ]
+    commands = [ 'SLURM_ARRAY_TASK_ID=%d bash %s > %s_%d.log'%(i, fname, fname, i )
+                for i in range(int(start), int(end)) ]
     with concurrent.futures.ThreadPoolExecutor(max_workers = cores) as pool:
         for _ in pool.map( os.system, commands ):
             pass
diff --git a/appveyor.yml b/appveyor.yml
index 600d09d0..acc87bbc 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -20,7 +20,7 @@ install:
   - "set TMPDIR=C:\\tmp"
   - python -c "import sys; print(sys.executable, sys.version)"
   - python -m pip install --upgrade pip setuptools
-  - python -m pip install pytest numpy
+  - python -m pip install pytest 'numpy<2'
   - python -m pip install --ignore-installed certifi --upgrade-strategy only-if-needed --only-binary=h5py --only-binary=scipy --only-binary=hdf5plugin .
 
 
diff --git a/pyproject.toml b/pyproject.toml
index a59ec013..450bf7b9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,5 +3,16 @@ requires = ["setuptools",
             "six",
             "wheel",
             "numpy; python_version=='2.7'",
+# There is no way to compile for versions < 1.25 and up to 2.
+# See https://numpy.org/doc/2.0/dev/depending_on_numpy.html
+#
+# This gives you all versions < 2.0
             "oldest-supported-numpy; python_version>='3.0'" ]
+#
+# This gives all versions > 1.25
+#            "numpy>=2.0.0rc1; python_version>='3.0'" ]
+#
+# As usual, the dependencies are not ready.
+# pin numpy < 2 for now.
+#
 build-backend = "setuptools.build_meta"
diff --git a/setup.py b/setup.py
index fe9445a0..edb46c11 100644
--- a/setup.py
+++ b/setup.py
@@ -142,7 +142,9 @@ def build_extension(self, ext):
 
 minimal = [  # can't compile without this
     "six",
-    "numpy",
+    'numpy ; python_version < "3"',
+    # Until the dependencies are ready
+    'numpy<2 ; python_version >= "3"',
     "setuptools",
     ]