diff --git a/.ci_support/environment.yml b/.ci_support/environment.yml
index 7fea66ad6..56509260c 100644
--- a/.ci_support/environment.yml
+++ b/.ci_support/environment.yml
@@ -10,7 +10,7 @@ dependencies:
 - numpy =1.26.4
 - phonopy =2.21.0
 - plotly =5.18.0
-- pymatgen =2024.1.27
+- pymatgen =2024.2.8
 - pyscal =2.10.18
 - pyxtal =0.6.2
 - scikit-learn =1.4.0
diff --git a/pyproject.toml b/pyproject.toml
index ad154f167..d948c4e84 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -38,7 +38,7 @@ Repository = "https://github.com/pyiron/structuretoolkit"
 [project.optional-dependencies]
 grainboundary = [
     "aimsgb==1.1.0",
-    "pymatgen==2024.1.27",
+    "pymatgen==2024.2.8",
 ]
 pyscal = ["pyscal2==2.10.18"]
 nglview = ["nglview==3.1.1"]
@@ -48,7 +48,7 @@ clusters = ["scikit-learn==1.4.0"]
 symmetry = ["spglib==2.3.1"]
 surface = [
     "spglib==2.3.1",
-    "pymatgen==2024.1.27",
+    "pymatgen==2024.2.8",
 ]
 phonopy = [
     "phonopy==2.21.0",