diff --git a/requirements.txt b/requirements.txt
index 5639a3fa0..9d6a37cc3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,4 +6,4 @@ pytest
 wkw>=0.0.6
 requests
 black
-cluster_tools==1.18
+cluster_tools>=1.18
diff --git a/setup.py b/setup.py
index 2804893fa..c07ffd875 100644
--- a/setup.py
+++ b/setup.py
@@ -3,8 +3,8 @@
 setup(
     name="wkcuber",
     packages=find_packages(exclude=("tests",)),
-    version="0.2.8",
-    install_requires=["scipy", "numpy", "pillow", "pyyaml", "wkw"],
+    version="0.2.9",
+    install_requires=["scipy", "numpy", "pillow", "pyyaml", "wkw", "cluster_tools>=1.18"],
     description="A cubing tool for webKnossos",
     author="Norman Rzepka",
     author_email="norman.rzepka@scalableminds.com",