diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8b69e41..4dc2581 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.5)
+cmake_minimum_required(VERSION 3.9)
 
 project(nekoray VERSION 0.1 LANGUAGES CXX)
 
@@ -6,6 +6,7 @@ set(CMAKE_INCLUDE_CURRENT_DIR ON)
 
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_INTERPROCEDURAL_OPTIMIZATION ON)
 
 find_package(Qt6 REQUIRED COMPONENTS Widgets Network Svg LinguistTools QuickControls2)