diff --git a/.ci_support/environment-docs.yml b/.ci_support/environment-docs.yml
index c92ddbb15..7dc01e731 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 1e70e49e3..ec4222639 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 601335e57..7f3112219 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