diff --git a/aimsim/__init__.py b/aimsim/__init__.py
index 03ed5ff..b8b9356 100644
--- a/aimsim/__init__.py
+++ b/aimsim/__init__.py
@@ -3,4 +3,4 @@
 from . import chemical_datastructures
 from . import utils
 
-__version__ = "2.1.0"
+__version__ = "2.1.1"