diff --git a/laminci/_run_notebooks.py b/laminci/_run_notebooks.py
index 5bfdcb9..d72dc28 100644
--- a/laminci/_run_notebooks.py
+++ b/laminci/_run_notebooks.py
@@ -6,4 +6,6 @@
 def run_notebooks(file_or_folder: str | Path):
     import nbproject_test
 
-    nbproject_test.execute_notebooks(Path(file_or_folder), write=True)
+    path = Path(file_or_folder)
+    assert path.exists()
+    nbproject_test.execute_notebooks(path.resolve(), write=True)