diff --git a/docs/conf.py b/docs/conf.py
index bfa4c8fd..2d39be73 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -19,7 +19,7 @@
 # -- Project information -----------------------------------------------------
 
 project = "LibMultiLabel"
-copyright = "2021, LibMultiLabel Project"
+copyright = "2023, LibMultiLabel Project"
 author = "LibMultiLabel Authors"
 
 
diff --git a/setup.cfg b/setup.cfg
index efe5afef..1f2dcf2d 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = libmultilabel
-version = 0.3.4
+version = 0.4.0
 author = LibMultiLabel Team
 license = MIT License
 license_file = LICENSE