diff --git a/src/neo4j/_async/work/session.py b/src/neo4j/_async/work/session.py
index bfe4a9372..30ce958a0 100644
--- a/src/neo4j/_async/work/session.py
+++ b/src/neo4j/_async/work/session.py
@@ -353,6 +353,7 @@ async def last_bookmark(self) -> t.Optional[str]:
             return self._bookmarks[-1]
         return None
 
+    @AsyncNonConcurrentMethodChecker.non_concurrent_method
     async def last_bookmarks(self) -> Bookmarks:
         """Return most recent bookmarks of the session.
 
diff --git a/src/neo4j/_sync/work/session.py b/src/neo4j/_sync/work/session.py
index 13b283fe9..f906fa3d9 100644
--- a/src/neo4j/_sync/work/session.py
+++ b/src/neo4j/_sync/work/session.py
@@ -353,6 +353,7 @@ def last_bookmark(self) -> t.Optional[str]:
             return self._bookmarks[-1]
         return None
 
+    @NonConcurrentMethodChecker.non_concurrent_method
     def last_bookmarks(self) -> Bookmarks:
         """Return most recent bookmarks of the session.