diff --git a/pyproject.toml b/pyproject.toml
index a81ca21..28962ca 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "nexa-backtest"
-version = "0.1.0"
+version = "0.1.0b1"
 description = "Backtesting framework for European power markets"
 authors = ["Phase Nexa <dev@phasenexa.com>"]
 license = "MIT"
diff --git a/src/nexa_backtest/_version.py b/src/nexa_backtest/_version.py
index 3dc1f76..eb8f377 100644
--- a/src/nexa_backtest/_version.py
+++ b/src/nexa_backtest/_version.py
@@ -1 +1 @@
-__version__ = "0.1.0"
+__version__ = "0.1.0b1"