diff --git a/pyproject.toml b/pyproject.toml
index 7703219..2f719a8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "py-smps"
-version = "2.1.0a2"
+version = "2.1.0a3"
 description = "A simple python library to import and visualize data from particle sizing instruments."
 authors = ["David H Hagan <david.hagan@quant-aq.com>"]
 license = "MIT"