diff --git a/src/arviz_base/_version.py b/src/arviz_base/_version.py
index bb1fbe0..924118f 100644
--- a/src/arviz_base/_version.py
+++ b/src/arviz_base/_version.py
@@ -1,3 +1,3 @@
 """Base ArviZ version."""
 
-__version__ = "0.4.0"
+__version__ = "0.5.0.dev0"