diff --git a/.ci_support/environment.yml b/.ci_support/environment.yml
index e5748506d..9b39374dc 100644
--- a/.ci_support/environment.yml
+++ b/.ci_support/environment.yml
@@ -5,7 +5,7 @@ dependencies:
 - ase =3.22.1
 - coverage
 - dscribe =2.1.1
-- matplotlib-base =3.8.4
+- matplotlib-base =3.9.0
 - nglview =3.1.2
 - notebook
 - numpy =1.26.4
diff --git a/pyproject.toml b/pyproject.toml
index 0635d01f0..a71bbc540 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,7 +43,7 @@ grainboundary = [
 ]
 pyscal = ["pyscal2==2.10.18"]
 nglview = ["nglview==3.1.2"]
-matplotlib = ["matplotlib==3.8.4"]
+matplotlib = ["matplotlib==3.9.0"]
 plotly = ["plotly==5.22.0"]
 clusters = ["scikit-learn==1.5.0"]
 symmetry = ["spglib==2.4.0"]