diff --git a/pyproject.toml b/pyproject.toml
index 368d2f1..f1dd4b3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "Ambrosia"
-version = "0.3.0"
+version = "0.4.0"
 description = "A Python library for working with A/B tests."
 license = "Apache-2.0"
 authors = [
@@ -102,4 +102,4 @@ markers = [
 
 [build-system]
 requires = ["poetry>=1.0.5"]
-build-backend = "poetry.masonry.api"
\ No newline at end of file
+build-backend = "poetry.masonry.api"