diff --git a/pyproject.toml b/pyproject.toml
index dac1837..1d83e3f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "ncompare"
-version = "1.12.0a10"
+version = "1.13.0a0"
 description = "Compare the structure of two NetCDF files at the command line"
 authors = ["Daniel Kaufman <daniel.kaufman@nasa.gov>"]
 readme = "README.md"