diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7bce0c3..a7755ef 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -33,7 +33,7 @@ endif()
 # ``-DCMAKE_CXX_STANDARD=<standard>`` when invoking CMake
 set(CMAKE_CXX_STANDARD 17 CACHE STRING "")
 
-if(NOT CMAKE_CXX_STANDARD MATCHES "14|17")
+if(NOT CMAKE_CXX_STANDARD MATCHES "17|20")
   message(FATAL_ERROR "Unsupported C++ standard: ${CMAKE_CXX_STANDARD}")
 endif()