diff --git a/rerun_py/rerun_sdk/rerun/notebook.py b/rerun_py/rerun_sdk/rerun/notebook.py
index b10356e8e5a5..6d79b6c97113 100644
--- a/rerun_py/rerun_sdk/rerun/notebook.py
+++ b/rerun_py/rerun_sdk/rerun/notebook.py
@@ -38,6 +38,9 @@ def set_default_size(*, width: int | None, height: int | None) -> None:
         _default_height = height
 
 
+_version_mismatch_checked = False
+
+
 class Viewer:
     """
     A viewer embeddable in a notebook.
@@ -80,6 +83,20 @@ def __init__(
         """
 
         try:
+            global _version_mismatch_checked
+            if not _version_mismatch_checked:
+                import importlib.metadata
+                import warnings
+
+                rerun_notebook_version = importlib.metadata.version("rerun-notebook")
+                rerun_version = importlib.metadata.version("rerun-sdk")
+                if rerun_version != rerun_notebook_version:
+                    warnings.warn(
+                        f"rerun-notebook version mismatch: rerun-sdk {rerun_version}, rerun-notebook {rerun_notebook_version}",
+                        category=ImportWarning,
+                    )
+                _version_mismatch_checked = True
+
             from rerun_notebook import Viewer as _Viewer  # type: ignore[attr-defined]
         except ImportError:
             logging.error("Could not import rerun_notebook. Please install `rerun-notebook`.")