diff --git a/lib/net/http/header.rb b/lib/net/http/header.rb
index e04c6056c1..b99cf17c32 100644
--- a/lib/net/http/header.rb
+++ b/lib/net/http/header.rb
@@ -21,10 +21,10 @@ module Net::HTTPHeader
         warn "net/http: nil HTTP header: #{key}", uplevel: 3 if $VERBOSE
       else
         value = value.strip # raise error for invalid byte sequences
-        if key.bytesize > MAX_KEY_LENGTH
+        if key.to_s.bytesize > MAX_KEY_LENGTH
           raise ArgumentError, "too long (#{key.bytesize} bytes) header: #{key[0, 30].inspect}..."
         end
-        if value.bytesize > MAX_FIELD_LENGTH
+        if value.to_s.bytesize > MAX_FIELD_LENGTH
           raise ArgumentError, "header #{key} has too long field vallue: #{value.bytesize}"
         end
         if value.count("\r\n") > 0
diff --git a/version.h b/version.h
index 7844875966..088503c681 100644
--- a/version.h
+++ b/version.h
@@ -2,7 +2,7 @@
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 8
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 224
+#define RUBY_PATCHLEVEL 225
 
 #define RUBY_RELEASE_YEAR 2023
 #define RUBY_RELEASE_MONTH 3