diff --git a/docs/source/conf.py b/docs/source/conf.py
index 8dd6e9d..cd9f58c 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -15,7 +15,7 @@
 project = 'Fix The Engines'
 copyright = '2024, Jakub Suchenek, Michał Gołębiewski'
 author = 'Jakub Suchenek, Michał Gołębiewski'
-release = '0.1.1'
+release = '0.4.0'
 
 # -- General configuration ---------------------------------------------------
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#general-configuration