diff --git a/.ci_support/environment-docs.yml b/.ci_support/environment-docs.yml
index 346ee978..362caba8 100644
--- a/.ci_support/environment-docs.yml
+++ b/.ci_support/environment-docs.yml
@@ -11,7 +11,7 @@ dependencies:
 - numpy =1.26.3
 - scipy =1.12.0
 - spglib =2.2.0
-- phonopy =2.21.0
+- phonopy =2.21.2
 - structuretoolkit =0.0.21
 - seekpath =2.1.0
 - lammps =2023.11.21
diff --git a/.ci_support/environment.yml b/.ci_support/environment.yml
index 51db6214..b3b17a27 100644
--- a/.ci_support/environment.yml
+++ b/.ci_support/environment.yml
@@ -6,6 +6,6 @@ dependencies:
 - numpy =1.26.4
 - scipy =1.12.0
 - spglib =2.3.1
-- phonopy =2.21.0
+- phonopy =2.21.2
 - structuretoolkit =0.0.21
 - seekpath =2.1.0
diff --git a/binder/environment.yml b/binder/environment.yml
index f863ab1e..2b597c50 100644
--- a/binder/environment.yml
+++ b/binder/environment.yml
@@ -6,7 +6,7 @@ dependencies:
 - numpy =1.26.4
 - scipy =1.12.0
 - spglib =2.3.1
-- phonopy =2.21.0
+- phonopy =2.21.2
 - structuretoolkit =0.0.21
 - seekpath =2.1.0
 - gpaw =24.1.0
diff --git a/pyproject.toml b/pyproject.toml
index 97dbadf7..e1a80a6e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -39,7 +39,7 @@ Repository = "https://github.com/pyiron/atomistics"
 
 [project.optional-dependencies]
 phonopy = [
-    "phonopy==2.21.0",
+    "phonopy==2.21.2",
     "seekpath==2.1.0",
     "structuretoolkit==0.0.21",
 ]