diff --git a/.ci_support/environment.yml b/.ci_support/environment.yml
index 1d6762710..b615a45e6 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 =2.2.4
 - phonopy =2.38.0
 - plotly =6.0.1
 - pymatgen =2025.3.10
diff --git a/.ci_support/environment_mini.yml b/.ci_support/environment_mini.yml
index adcc8b754..46ce0f080 100644
--- a/.ci_support/environment_mini.yml
+++ b/.ci_support/environment_mini.yml
@@ -3,6 +3,6 @@ channels:
 dependencies:
 - ase =3.24.0
 - coverage
-- numpy =1.26.4
+- numpy =2.2.4
 - scipy =1.15.2
 - setuptools
diff --git a/pyproject.toml b/pyproject.toml
index 89d5b175a..9a8926ef5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,7 +25,7 @@ classifiers = [
 ]
 dependencies = [
     "ase==3.24.0",
-    "numpy==1.26.4",
+    "numpy==2.2.4",
     "scipy==1.15.2",
 ]
 dynamic = ["version"]
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])"