diff --git a/mushroom_rl/__init__.py b/mushroom_rl/__init__.py
index c24ed73b..63a58789 100644
--- a/mushroom_rl/__init__.py
+++ b/mushroom_rl/__init__.py
@@ -1 +1 @@
-__version__ = '1.5.4'
+__version__ = '1.5.5'