diff --git a/tests/test-org-roam-node.el b/tests/test-org-roam-node.el
index 8f71c5d..31972b0 100644
--- a/tests/test-org-roam-node.el
+++ b/tests/test-org-roam-node.el
@@ -73,14 +73,16 @@
       (expect (org-roam-node-title node) :to-equal "Bruce Wayne"))))
 
 (describe "org-roam-demote-entire-buffer"
-  (after-each
-    (cd root-directory))
-
   (it "demotes an entire org buffer"
-    (find-file "tests/roam-files/demoteable.org" nil)
-    (org-roam-demote-entire-buffer)
-    (expect (buffer-substring-no-properties (point) (point-max))
-            :to-equal "* Demoteable\n:PROPERTIES:\n:ID: 97bf31cf-dfee-45d8-87a5-2ae0dabc4734\n:END:\n\n** Demoteable h1\n\n*** Demoteable child\n")))
+    ;; Use a temporary copy to avoid interfering with other tests
+    (let ((temp-file (make-temp-file "test-demoteable-" nil ".org")))
+      (copy-file "tests/roam-files/demoteable.org" temp-file t)
+      (find-file temp-file)
+      (org-roam-demote-entire-buffer)
+      (expect (buffer-substring-no-properties (point) (point-max))
+              :to-equal "* Demoteable\n:PROPERTIES:\n:ID: 97bf31cf-dfee-45d8-87a5-2ae0dabc4734\n:END:\n\n** Demoteable h1\n\n*** Demoteable child\n")
+      (kill-buffer)
+      (delete-file temp-file))))
 
 (describe "org-roam--h1-count"
   (after-each