diff --git a/src/bioimage_cpp/_version.py b/src/bioimage_cpp/_version.py
index 493f741..6a9beea 100644
--- a/src/bioimage_cpp/_version.py
+++ b/src/bioimage_cpp/_version.py
@@ -1 +1 @@
-__version__ = "0.3.0"
+__version__ = "0.4.0"