diff --git a/pyproject.toml b/pyproject.toml
index 031c452..74f1c85 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ classifiers = [
 ]
 dependencies = [
   "click",
-  "capellambse>=0.5.64",
+  "capellambse>=0.5.64,<0.6",
 ]
 
 [project.urls]