diff --git a/src/learn/learner.cpp b/src/learn/learner.cpp
index 88f2a0c3..7021fd7f 100644
--- a/src/learn/learner.cpp
+++ b/src/learn/learner.cpp
@@ -39,6 +39,7 @@
 #include <memory>
 #include <limits>
 #include <optional>
+#include <filesystem>
 
 #if defined (_OPENMP)
 #include <omp.h>
@@ -1467,7 +1468,7 @@ namespace Learner
             cout << ".";
         };
 
-        Dependency::mkdir("tmp");
+        std::filesystem::create_directory("tmp");
 
         // Shuffle and export as a 10M phase shredded file.
         for (auto filename : filenames)
diff --git a/src/misc.cpp b/src/misc.cpp
index 5c2a4637..a23b1205 100644
--- a/src/misc.cpp
+++ b/src/misc.cpp
@@ -687,66 +687,3 @@ int write_memory_to_file(std::string filename, void* ptr, uint64_t size)
     fs.close();
     return 0;
 }
-
-// ----------------------------
-//     mkdir wrapper
-// ----------------------------
-
-// Specify relative to the current folder. Returns 0 on success, non-zero on failure.
-// Create a folder. Japanese is not used.
-// In case of gcc under msys2 environment, folder creation fails with _wmkdir(). Cause unknown.
-// Use _mkdir() because there is no help for it.
-
-#if defined(_WIN32)
-// for Windows
-
-#if defined(_MSC_VER)
-#include <codecvt> // I need this because I want wstring to mkdir
-#include <locale> // This is required for wstring_convert.
-
-namespace Dependency {
-    int mkdir(std::string dir_name)
-    {
-        std::wstring_convert<std::codecvt_utf8<wchar_t>, wchar_t> cv;
-        return _wmkdir(cv.from_bytes(dir_name).c_str());
-        //	::CreateDirectory(cv.from_bytes(dir_name).c_str(),NULL);
-    }
-}
-
-#elif defined(__GNUC__) 
-
-#include <direct.h>
-namespace Dependency {
-    int mkdir(std::string dir_name)
-    {
-        return _mkdir(dir_name.c_str());
-    }
-}
-
-#endif
-#elif defined(__linux__)
-
-// In the linux environment, this symbol _LINUX is defined in the makefile.
-
-// mkdir implementation for Linux.
-#include "sys/stat.h"
-
-namespace Dependency {
-    int mkdir(std::string dir_name)
-    {
-        return ::mkdir(dir_name.c_str(), 0777);
-    }
-}
-#else
-
-// In order to judge whether it is a Linux environment, we have to divide the makefile..
-// The function to dig a folder on linux is good for the time being... Only used to save the evaluation function file...
-
-namespace Dependency {
-    int mkdir(std::string /* dir_name */)
-    {
-        return 0;
-    }
-}
-
-#endif
diff --git a/src/misc.h b/src/misc.h
index d73d0633..c918a351 100644
--- a/src/misc.h
+++ b/src/misc.h
@@ -273,11 +273,6 @@ namespace Dependency
   // So when calling getline() on fstream,
   // just write getline() instead of std::getline() and use this function.
   extern bool getline(std::ifstream& fs, std::string& s);
-
-  // Create a folder.
-  // Specify relative to the current folder. Japanese is not used for dir_name.
-  // Returns 0 on success, non-zero on failure.
-  extern int mkdir(std::string dir_name);
 }
 
 #endif // #ifndef MISC_H_INCLUDED
diff --git a/src/nnue/evaluate_nnue_learner.cpp b/src/nnue/evaluate_nnue_learner.cpp
index 650f443e..13d9d578 100644
--- a/src/nnue/evaluate_nnue_learner.cpp
+++ b/src/nnue/evaluate_nnue_learner.cpp
@@ -4,6 +4,7 @@
 
 #include <random>
 #include <fstream>
+#include <filesystem>
 
 #include "../learn/learn.h"
 #include "../learn/learning_tools.h"
@@ -207,7 +208,7 @@ void save_eval(std::string dir_name) {
   // mkdir() will fail if this folder already exists, but
   // Apart from that. If not, I just want you to make it.
   // Also, assume that the folders up to EvalSaveDir have been dug.
-  Dependency::mkdir(eval_dir);
+  std::filesystem::create_directories(eval_dir);
 
   if (Options["SkipLoadingEval"] && NNUE::trainer) {
     NNUE::SendMessages({{"clear_unobserved_feature_weights"}});