diff --git a/modelskill/__init__.py b/modelskill/__init__.py
index f45f775b3..20a574cb9 100644
--- a/modelskill/__init__.py
+++ b/modelskill/__init__.py
@@ -19,7 +19,7 @@
 # Dev branch marker is: 'X.Y.dev' or 'X.Y.devN' where N is an integer.
 # 'X.Y.dev0' is the canonical version of 'X.Y.dev'
 #
-__version__ = "1.0.b0"
+__version__ = "1.0.b1"
 
 if "64" not in architecture()[0]:
     raise Exception("This library has not been tested for a 32 bit system.")
diff --git a/pyproject.toml b/pyproject.toml
index 493e07340..29fac2dd3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,7 @@ exclude = ["notebooks", "tests"]
 
 [project]
 name="modelskill"
-version="1.0.b0"
+version="1.0.b1"
 dependencies = [
     "numpy",
     "pandas",