diff --git a/pyproject.toml b/pyproject.toml
index 0beb273..561515a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,7 +12,7 @@ license = "GPL-3.0-or-later"
 name = "imcflibs"
 readme = "README.md"
 repository = "https://github.com/imcf/python-imcflibs"
-version = "0.0.0"
+version = "1.5.0.a8"
 
 # NOTE: to create an environment using 'poetry install' or similar operations,
 # the following modifications are temporarily necessary (can / should be