diff --git a/CMakeLists.txt b/CMakeLists.txt
index 30d1059..618006e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -29,7 +29,7 @@ project(shione
 set(PROJECT_VERSION_SUFFIX "") # alpha/beta/rc, e.g. "-rc0"
 set(PROJECT_VERSION "${PROJECT_VERSION}${PROJECT_VERSION_SUFFIX}")
 set(PROJECT_AUTHOR "renken")
-set(PROJECT_COPYRIGHT "2022, renken")
+set(PROJECT_COPYRIGHT "2023, renken")
 set(PROJECT_MAIL "mail@renken.systems")
 # only set CMAKE variant when local name matches CMAKE name
 # this avoids clashing when being used as a subproject