diff --git a/ward/_ward_version.py b/ward/_ward_version.py
index c02edaa7..fe5d18ee 100644
--- a/ward/_ward_version.py
+++ b/ward/_ward_version.py
@@ -1 +1 @@
-__version__ = "0.39.0b0"
+__version__ = "0.40.0b0"