diff --git a/pyproject.toml b/pyproject.toml
index 451fee50a..c5c045a9e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "mxcubeweb"
-version = "4.20.0"
+version = "4.21.0"
 license = "LGPL-3.0-or-later"
 description = "MXCuBE Web user interface"
 authors = ["The MXCuBE collaboration <mxcube@esrf.fr>"]