diff --git a/CMakeLists.txt b/CMakeLists.txt
index f6f4fab..f46c072 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,5 @@
-cmake_minimum_required(VERSION 3.13)
+# SDL::SDL was defined on 3.20.
+cmake_minimum_required(VERSION 3.20)
 
 set(TOOLS_PREFIX ${CMAKE_BINARY_DIR}/tools)
 include(ExternalProject)