diff --git a/.ci_support/environment.yml b/.ci_support/environment.yml
index d7c937b3..0d699c4b 100644
--- a/.ci_support/environment.yml
+++ b/.ci_support/environment.yml
@@ -4,7 +4,7 @@ dependencies:
 - ase =3.23.0
 - coverage
 - lxml =5.3.0
-- mendeleev =0.17.0
+- mendeleev =0.18.0
 - numpy =1.26.4
 - pandas =2.2.3
 - phonopy =2.26.6
diff --git a/pyproject.toml b/pyproject.toml
index fdcddf49..4f466d29 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -58,7 +58,7 @@ lammps_phonons = [
 ]
 experimental = [
     "lxml==5.3.0",
-    "mendeleev==0.17.0",
+    "mendeleev==0.18.0",
     "pandas==2.2.3",
     "requests==2.32.3",
 ]