diff --git a/.ci_support/environment.yml b/.ci_support/environment.yml
index db143630..8a81a286 100644
--- a/.ci_support/environment.yml
+++ b/.ci_support/environment.yml
@@ -7,5 +7,5 @@ dependencies:
 - scipy =1.11.4
 - spglib =2.1.0
 - phonopy =2.20.0
-- structuretoolkit =0.0.12
+- structuretoolkit =0.0.15
 - seekpath =2.1.0
diff --git a/pyproject.toml b/pyproject.toml
index 978bc6b9..27d40091 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,7 +41,7 @@ Repository = "https://github.com/pyiron/atomistics"
 phonopy = [
     "phonopy==2.20.0",
     "seekpath==2.1.0",
-    "structuretoolkit==0.0.12",
+    "structuretoolkit==0.0.15",
 ]
 gpaw = [
     "gpaw==23.9.1",