diff --git a/siuba/__init__.py b/siuba/__init__.py
index 5f3872e1..1488cab5 100644
--- a/siuba/__init__.py
+++ b/siuba/__init__.py
@@ -1,5 +1,5 @@
 # version ---------------------------------------------------------------------
-__version__ = "0.4.0rc1"
+__version__ = "0.4.0"
 
 # default imports--------------------------------------------------------------
 from .siu import _, Fx, Lam