diff --git a/.ci_support/environment.yml b/.ci_support/environment.yml
index 89feaec6b..9c1122603 100644
--- a/.ci_support/environment.yml
+++ b/.ci_support/environment.yml
@@ -7,7 +7,7 @@ dependencies:
 - matplotlib-base =3.8.2
 - nglview =3.1.1
 - notebook
-- numpy =1.26.3
+- numpy =1.26.4
 - phonopy =2.21.0
 - plotly =5.18.0
 - pymatgen =2024.1.27
diff --git a/.ci_support/environment_mini.yml b/.ci_support/environment_mini.yml
index ff2cb899f..0fd1486d4 100644
--- a/.ci_support/environment_mini.yml
+++ b/.ci_support/environment_mini.yml
@@ -3,5 +3,5 @@ channels:
 dependencies:
 - ase =3.22.1
 - coverage
-- numpy =1.26.3
+- numpy =1.26.4
 - scipy =1.12.0
diff --git a/pyproject.toml b/pyproject.toml
index 8d97aa129..a9c77e62b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,7 +25,7 @@ classifiers = [
 ]
 dependencies = [
     "ase==3.22.1",
-    "numpy==1.26.3",
+    "numpy==1.26.4",
     "scipy==1.12.0",
 ]
 dynamic = ["version"]