diff --git a/pyproject.toml b/pyproject.toml
index aec6140a4..99f371249 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,7 +26,7 @@ name = "blending_toolkit"
 packages = [{include = "btk"}]
 readme = "README.md"
 repository = "https://github.com/LSSTDESC/BlendingToolKit"
-version = "1.0.0a2"
+version = "1.0.0a4"
 
 [tool.poetry.dependencies]
 astropy = [{version = "^4.3.1", python = "~3.7.1"}, {version = ">=5.1", python = ">=3.8"}]