diff --git a/.ci_support/environment-docs.yml b/.ci_support/environment-docs.yml
index 544d24590..4f8d86b32 100644
--- a/.ci_support/environment-docs.yml
+++ b/.ci_support/environment-docs.yml
@@ -11,7 +11,7 @@ dependencies:
 - defusedxml =0.7.1
 - h5py =3.12.1
 - matplotlib-base =3.10.0
-- mendeleev =0.19.0
+- mendeleev =0.20.1
 - mp-api =0.45.1
 - numpy =1.26.4
 - pandas =2.2.3
diff --git a/.ci_support/environment.yml b/.ci_support/environment.yml
index 1a0f7f255..15e54c743 100644
--- a/.ci_support/environment.yml
+++ b/.ci_support/environment.yml
@@ -9,7 +9,7 @@ dependencies:
 - defusedxml =0.7.1
 - h5py =3.12.1
 - matplotlib-base =3.10.0
-- mendeleev =0.19.0
+- mendeleev =0.20.1
 - mp-api =0.45.1
 - numpy =1.26.4
 - pandas =2.2.3
diff --git a/binder/environment.yml b/binder/environment.yml
index 6bd75aaf1..bedd0580f 100644
--- a/binder/environment.yml
+++ b/binder/environment.yml
@@ -7,7 +7,7 @@ dependencies:
 - defusedxml =0.7.1
 - h5py =3.12.1
 - matplotlib-base =3.10.0
-- mendeleev =0.19.0
+- mendeleev =0.20.1
 - mp-api =0.45.1
 - numpy =1.26.4
 - pandas =2.2.3
diff --git a/pyproject.toml b/pyproject.toml
index 31c49c1a9..9877c0300 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ dependencies = [
     "defusedxml==0.7.1",
     "h5py==3.12.1",
     "matplotlib==3.10.0",
-    "mendeleev==0.19.0",
+    "mendeleev==0.20.1",
     "mp-api==0.45.1",
     "numpy==1.26.4",
     "pandas==2.2.3",