diff --git a/pyproject.toml b/pyproject.toml
index 8e4206c..cda85ed 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "spec2vec"
-version = "0.8.1"
+version = "0.9.1"
 description = "Word2Vec based similarity measure of mass spectrometry data."
 authors = ["Florian Huber <florian.huber@hs-duesseldorf.de>"]
 license = "Apache Software License 2.0"
diff --git a/spec2vec/__version__.py b/spec2vec/__version__.py
index e4e49b3..8969d49 100644
--- a/spec2vec/__version__.py
+++ b/spec2vec/__version__.py
@@ -1 +1 @@
-__version__ = '0.9.0'
+__version__ = '0.9.1'