diff --git a/NEWS.md b/NEWS.md
index 3306e3e5f6e713..9bd78dd6b3a168 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -314,8 +314,8 @@ A lot of work has gone into making Ractors more stable, performant, and usable.
 * ZJIT
     * Add an experimental method-based JIT compiler.
       Use `--enable-zjit` on `configure` to enable the `--zjit` support.
-    * As of Ruby 3.5.0-preview2, ZJIT is not yet ready for speeding up most benchmarks.
-      Please refrain from evaluating ZJIT just yet. Stay tuned for the Ruby 3.5 release.
+    * As of Ruby 4.0.0-preview1, ZJIT is not yet ready for speeding up most benchmarks.
+      Please refrain from evaluating ZJIT just yet. Stay tuned for the Ruby 4.0 release.
 * RJIT
     * `--rjit` is removed. We will move the implementation of the third-party JIT API
       to the [ruby/rjit](https://github.com/ruby/rjit) repository.
diff --git a/box.c b/box.c
index bdb80a788cb59a..0ea74182849269 100644
--- a/box.c
+++ b/box.c
@@ -509,7 +509,7 @@ copy_ext_file_error(char *message, size_t size)
 }
 #else
 static const char *
-copy_ext_file_error(char *message, size_t size, int copy_retvalue, char *src_path, char *dst_path)
+copy_ext_file_error(char *message, size_t size, int copy_retvalue, const char *src_path, const char *dst_path)
 {
     switch (copy_retvalue) {
       case 1:
@@ -532,7 +532,7 @@ copy_ext_file_error(char *message, size_t size, int copy_retvalue, char *src_pat
 #endif
 
 static int
-copy_ext_file(char *src_path, char *dst_path)
+copy_ext_file(const char *src_path, const char *dst_path)
 {
 #if defined(_WIN32)
     int rvalue;
@@ -664,7 +664,7 @@ rb_box_local_extension(VALUE box_value, VALUE fname, VALUE path)
 {
     char ext_path[MAXPATHLEN], fname2[MAXPATHLEN], basename[MAXPATHLEN];
     int copy_error, wrote;
-    char *src_path = RSTRING_PTR(path), *fname_ptr = RSTRING_PTR(fname);
+    const char *src_path = RSTRING_PTR(path), *fname_ptr = RSTRING_PTR(fname);
     rb_box_t *box = rb_get_box_t(box_value);
 
     fname_without_suffix(fname_ptr, fname2, sizeof(fname2));