diff --git a/conf.py b/conf.py
index 376280e..74cd9a3 100755
--- a/conf.py
+++ b/conf.py
@@ -18,7 +18,7 @@
 # -- Project information -----------------------------------------------------
 
 project = 'IoT Programming'
-copyright = '2021-2023, Motoki Miura'
+copyright = '2021-2025, Motoki Miura'
 author = 'Motoki Miura'