diff --git a/CMakeLists.txt b/CMakeLists.txt
index 35da4d82..d18019a9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -82,12 +82,12 @@ set(CMAKE_MACOSX_RPATH ON)
 if(${CMAKE_VERSION} VERSION_LESS "3.1.0")
   if(NOT MSVC)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99")
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++20")
   endif()
 else()
   # Set standard version for compiler.
   set(CMAKE_C_STANDARD 99)
-  set(CMAKE_CXX_STANDARD 11)
+  set(CMAKE_CXX_STANDARD 20)
   set(CMAKE_C_EXTENSIONS OFF)
   set(CMAKE_CXX_EXTENSIONS OFF)