diff --git a/myst_nb/__init__.py b/myst_nb/__init__.py
index 8c439de7..b1c2a369 100644
--- a/myst_nb/__init__.py
+++ b/myst_nb/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "0.3.0"
+__version__ = "0.4.0"
 
 from docutils import nodes
 from jupyter_sphinx.ast import (  # noqa: F401