diff --git a/src/lang/japanese.txt b/src/lang/japanese.txt
--- a/src/lang/japanese.txt
+++ b/src/lang/japanese.txt
@@ -2688,7 +2688,7 @@ STR_LAI_OBJECT_DESCRIPTION_COMPANY_OWNED_LAND                   :社有地
 STR_ABOUT_OPENTTD                                               :{WHITE}OpenTTDについて
 STR_ABOUT_ORIGINAL_COPYRIGHT                                    :{BLACK}オリジナル版権{COPYRIGHT} 1995 Chris Sawyer All rights reserved
 STR_ABOUT_VERSION                                               :{BLACK}OpenTTD バージョン {REV}
-STR_ABOUT_COPYRIGHT_OPENTTD                                     :{BLACK}OpenTTD {COPYRIGHT} 2002-2017 The OpenTTD team
+STR_ABOUT_COPYRIGHT_OPENTTD                                     :{BLACK}OpenTTD {COPYRIGHT} 2002-2018 The OpenTTD team
 
 # Save/load game/scenario
 STR_SAVELOAD_SAVE_CAPTION                                       :{WHITE}ゲームを保存