diff --git a/src/pie_datasets/builders/brat.py b/src/pie_datasets/builders/brat.py
index 116b23c5..f6bd728e 100644
--- a/src/pie_datasets/builders/brat.py
+++ b/src/pie_datasets/builders/brat.py
@@ -297,7 +297,9 @@ class BratBuilder(GeneratorBasedBuilder):
     ]
 
     BASE_DATASET_PATH = "DFKI-SLT/brat"
-    BASE_DATASET_REVISION = "70446e79e089d5e5cd5f3426061991a2fcfbf529"
+    BASE_DATASET_REVISION = (
+        None  # it is highly recommended to set this to a commit hash in any derived builder
+    )
 
     def _generate_document(self, example, **kwargs):
         return example_to_document(