diff --git a/pyproject.toml b/pyproject.toml
index 3113b491e..3709c94ae 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "geojson-modelica-translator"
-version = "0.9.1"
+version = "0.9.1-rc1"
 description = "Package for converting GeoJSON to Modelica models for urban scale analyses."
 authors = ["URBANopt DES Team <nicholas.long@nrel.gov>"]
 license = "BSD-4-Clause"