diff --git a/reno/sphinxext.py b/reno/sphinxext.py
index a6aabfd..3d4571e 100644
--- a/reno/sphinxext.py
+++ b/reno/sphinxext.py
@@ -143,6 +143,6 @@ def setup(app):
     app.add_directive('release-notes', ReleaseNotesDirective)
     metadata_dict = {
         'version': reno.__version__,
-        'parallel_read_safe': False
+        'parallel_read_safe': True
     }
     return metadata_dict