diff --git a/janus_core/__init__.py b/janus_core/__init__.py
index 48eb2134..84973f6a 100644
--- a/janus_core/__init__.py
+++ b/janus_core/__init__.py
@@ -4,4 +4,4 @@
 Tools for machine learnt interatomic potentials
 """
 
-__version__ = "0.1.0a0"
+__version__ = "0.1.0a1"
diff --git a/pyproject.toml b/pyproject.toml
index 391d356c..ee00f2f7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "janus-core"
-version = "0.1.0a0"
+version = "0.1.0a1"
 description = "Tools for machine learnt interatomic potentials"
 authors = [
     "Elliott Kasoar",