diff --git a/CITATION.cff b/CITATION.cff
index 0065676d..459d5a5b 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -35,4 +35,4 @@ keywords:
   - molecular dynamics
   - batteries
 license: Apache-2.0
-version: 1.1.0
+version: 1.2.1
diff --git a/pyproject.toml b/pyproject.toml
index 7a288038..4abe16ab 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,7 @@ build-backend = "setuptools.build_meta"
 # https://packaging.python.org/en/latest/specifications/declaring-project-metadata/
 [project]
 name = "GEMDAT"
-version = "1.1.0"
+version = "1.2.1"
 description = "Generalized Molecular Dynamics Analysis Tool"
 readme = "README.md"
 requires-python = ">=3.10"
@@ -104,7 +104,7 @@ allow_redefinition = true
 ignore_missing_imports = true
 
 [tool.bumpversion]
-current_version = "1.1.0"
+current_version = "1.2.1"
 
 [[tool.bumpversion.files]]
 filename = "src/gemdat/__init__.py"
diff --git a/src/gemdat/__init__.py b/src/gemdat/__init__.py
index c978343e..2beb72b8 100644
--- a/src/gemdat/__init__.py
+++ b/src/gemdat/__init__.py
@@ -9,7 +9,7 @@
 from .transitions import Transitions
 from .volume import Volume, trajectory_to_volume
 
-__version__ = '1.1.0'
+__version__ = '1.2.1'
 __all__ = [
     'Jumps',
     'load_known_material',