diff --git a/.ci_support/environment.yml b/.ci_support/environment.yml
index 4ac2a652c..6814d099a 100644
--- a/.ci_support/environment.yml
+++ b/.ci_support/environment.yml
@@ -9,7 +9,7 @@ dependencies:
 - matplotlib-base =3.10.1
 - nglview =3.1.4
 - notebook
-- numpy =1.26.4
+- numpy =2.3.1
 - phonopy =2.41.1
 - plotly =6.2.0
 - pymatgen =2025.3.10
@@ -19,3 +19,4 @@ dependencies:
 - scipy =1.15.2
 - spglib =2.6.0
 - sqsgenerator =0.3
+- sparse =0.17.0
diff --git a/.ci_support/environment_mini.yml b/.ci_support/environment_mini.yml
index 8041372c6..f197802a4 100644
--- a/.ci_support/environment_mini.yml
+++ b/.ci_support/environment_mini.yml
@@ -3,6 +3,6 @@ channels:
 dependencies:
 - ase =3.25.0
 - coverage
-- numpy =1.26.4
+- numpy =2.3.1
 - scipy =1.15.2
 - setuptools
diff --git a/.github/workflows/pipeline.yml b/.github/workflows/pipeline.yml
index c09fdf25c..ff431de6c 100644
--- a/.github/workflows/pipeline.yml
+++ b/.github/workflows/pipeline.yml
@@ -108,14 +108,10 @@ jobs:
           python-version: '3.11'
           label: linux-64-py-3-11
 
-        - operating-system: ubuntu-latest
-          python-version: '3.10'
-          label: linux-64-py-3-10
-
     steps:
     - uses: actions/checkout@v4
     - name: Merge conda environment
-      if:  matrix.operating-system != 'windows-latest'
+      if:  matrix.operating-system == 'ubuntu-latest'
       run: tail --lines=+4 .ci_support/environment-lammps.yml >> .ci_support/environment.yml
     - name: Conda config
       shell: bash -l {0}
diff --git a/pyproject.toml b/pyproject.toml
index 557d563bc..3aa5eab28 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,7 +25,7 @@ classifiers = [
 ]
 dependencies = [
     "ase==3.25.0",
-    "numpy==1.26.4",
+    "numpy==2.3.1",
     "scipy==1.15.2",
 ]
 dynamic = ["version"]
diff --git a/tests/test_symmetry.py b/tests/test_symmetry.py
index 1e29f5b71..4d390406c 100644
--- a/tests/test_symmetry.py
+++ b/tests/test_symmetry.py
@@ -136,10 +136,10 @@ def test_symmetrize_tensor(self):
         ).repeat(2)
         structure.symbols[0] = "Ni"
         symmetry = stk.analyse.get_symmetry(structure=structure)
-        self.assertLess(symmetry.symmetrize_tensor(np.random.randn(3)).ptp(), 1.0e-8)
+        self.assertLess(np.ptp(symmetry.symmetrize_tensor(np.random.randn(3))), 1.0e-8)
         sym_tensor = symmetry.symmetrize_tensor(np.random.randn(3, 3))
-        self.assertLess(sym_tensor.diagonal().ptp(), 1.0e-8)
-        self.assertLess(sym_tensor[np.triu_indices(3, k=1)].ptp(), 1.0e-8)
+        self.assertLess(np.ptp(sym_tensor.diagonal()), 1.0e-8)
+        self.assertLess(np.ptp(sym_tensor[np.triu_indices(3, k=1)]), 1.0e-8)
         i = np.all(structure.positions == [0.5, 0, 0.5], axis=-1)
         j = np.all(structure.positions == [0, 0.5, 0.5], axis=-1)
         s_tensor = symmetry.symmetrize_tensor(np.random.randn(len(structure)))
diff --git a/tests/test_visualize.py b/tests/test_visualize.py
index 5b8f31d7a..3360818b6 100644
--- a/tests/test_visualize.py
+++ b/tests/test_visualize.py
@@ -31,7 +31,7 @@ def test_get_frame(self):
         dx, counts = np.unique(
             np.diff(frame, axis=-2).squeeze().astype(int), axis=0, return_counts=True
         )
-        self.assertEqual(dx.ptp(), 1, msg="Frames not drawn along the nearest edges")
+        self.assertEqual(np.ptp(dx), 1, msg="Frames not drawn along the nearest edges")
         msg = (
             "There must be four lines along each direction"
             + " (4 x [1, 0, 0], 4 x [0, 1, 0] and 4 x [0, 0, 1])"