diff --git a/treetensor/config/meta.py b/treetensor/config/meta.py
index af6f7143f0a12e136e1fa470dbb87b2e094c1d30..d00763cb3fe29a3ed8ddcf4909e93cdcbd00bd4d 100644
--- a/treetensor/config/meta.py
+++ b/treetensor/config/meta.py
@@ -7,7 +7,7 @@ Overview:
 __TITLE__ = "DI-treetensor"
 
 #: Version of this project.
-__VERSION__ = "0.3.0"
+__VERSION__ = "0.4.0"
 
 #: Short description of the project, will be included in ``setup.py``.
 __DESCRIPTION__ = 'A flexible, generalized tree-based tensor structure.'