diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5fecb806..11f6a7ec 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,7 +6,7 @@ cmake_minimum_required(VERSION 3.10)
 
 project(newserv)
 
-set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD 23)
 set(CMAKE_CXX_STANDARD_REQUIRED True)
 if (MSVC)
     add_compile_options(/W4 /WX)
diff --git a/src/PlayerInventory.hh b/src/PlayerInventory.hh
index 20dd48e7..a0ef6e85 100644
--- a/src/PlayerInventory.hh
+++ b/src/PlayerInventory.hh
@@ -3,6 +3,7 @@
 #include <inttypes.h>
 #include <stddef.h>
 
+#include <algorithm>
 #include <array>
 #include <phosg/Encoding.hh>
 #include <phosg/JSON.hh>