diff --git a/P0267_RefImpl/P0267_RefImpl/cairo/CMakeLists.txt b/P0267_RefImpl/P0267_RefImpl/cairo/CMakeLists.txt
index 5ebeb6a..d0e9176 100644
--- a/P0267_RefImpl/P0267_RefImpl/cairo/CMakeLists.txt
+++ b/P0267_RefImpl/P0267_RefImpl/cairo/CMakeLists.txt
@@ -3,7 +3,7 @@ cmake_minimum_required(VERSION 3.8)
 project(io2d CXX)
 
 find_package(Cairo REQUIRED)
-find_package(GraphicsMagick REQUIRED)
+find_package(unofficial-graphicsmagick REQUIRED)
 
 add_library(io2d_cairo
 	cairo_renderer-graphicsmagickinit.cpp
@@ -24,7 +24,7 @@ target_include_directories(io2d_cairo PUBLIC
 
 target_compile_features(io2d_cairo PUBLIC cxx_std_17)
 
-target_link_libraries(io2d_cairo PUBLIC io2d_core Cairo::Cairo GraphicsMagick::GraphicsMagick)
+target_link_libraries(io2d_cairo PUBLIC io2d_core Cairo::Cairo unofficial::graphicsmagick::graphicsmagick)
 
 install(
 	TARGETS io2d_cairo EXPORT io2d_targets