diff --git a/Python.gitignore b/Python.gitignore
index 82f92755..4c1e8f74 100644
--- a/Python.gitignore
+++ b/Python.gitignore
@@ -78,6 +78,10 @@ target/
 # Jupyter Notebook
 .ipynb_checkpoints
 
+# marimo notebook
+#   marimo maintains a cache of binary data in __marimo__/cache/
+__marimo__/cache/
+
 # IPython
 profile_default/
 ipython_config.py