diff --git a/.ci_support/environment.yml b/.ci_support/environment.yml
index 8324fa566..7732ee154 100644
--- a/.ci_support/environment.yml
+++ b/.ci_support/environment.yml
@@ -3,7 +3,7 @@ channels:
 - conda-forge
 dependencies:
 - aimsgb =1.1.1
-- ase =3.26.0
+- ase =3.27.0
 - coverage
 - dscribe =2.1.2
 - matplotlib-base =3.10.8
diff --git a/.ci_support/environment_mini.yml b/.ci_support/environment_mini.yml
index cfe7cfe15..c7678757d 100644
--- a/.ci_support/environment_mini.yml
+++ b/.ci_support/environment_mini.yml
@@ -1,7 +1,7 @@
 channels:
 - conda-forge
 dependencies:
-- ase =3.26.0
+- ase =3.27.0
 - coverage
 - numpy =2.3.5
 - scipy =1.16.3
diff --git a/pyproject.toml b/pyproject.toml
index 8a9727ee8..197e17a5b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,7 +24,7 @@ classifiers = [
     "Programming Language :: Python :: 3.13",
 ]
 dependencies = [
-    "ase==3.26.0",
+    "ase==3.27.0",
     "numpy==2.3.5",
     "scipy==1.16.3",
 ]