diff --git a/pyproject.toml b/pyproject.toml
index 2e03b82..098ede8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "stitchee"
-version = "1.5.0a8"
+version = "1.6.0a0"
 description = "NetCDF4 Along-existing-dimension Concatenation Service"
 authors = ["Daniel Kaufman <daniel.kaufman@nasa.gov>"]
 readme = "README.md"