diff --git a/bindings/vapi/gmime-2.6.vapi b/bindings/vapi/gmime-2.6.vapi
index 2f03d5f8..c7769fc1 100644
--- a/bindings/vapi/gmime-2.6.vapi
+++ b/bindings/vapi/gmime-2.6.vapi
@@ -1252,6 +1252,8 @@ namespace GMime {
 	[CCode (cheader_filename = "gmime/gmime.h")]
 	public const int ENABLE_RFC2047_WORKAROUNDS;
 	[CCode (cheader_filename = "gmime/gmime.h")]
+	public const int ENABLE_USE_ONLY_USER_CHARSETS;
+	[CCode (cheader_filename = "gmime/gmime.h")]
 	public const int FILTER_ENRICHED_IS_RICHTEXT;
 	[CCode (cheader_filename = "gmime/gmime.h")]
 	public const int FILTER_HTML_CITE;
@@ -1346,9 +1348,9 @@ namespace GMime {
 	[CCode (cheader_filename = "gmime/gmime.h", cname = "g_mime_utils_decode_8bit")]
 	public static string utils_decode_8bit (string text, size_t len);
 	[CCode (cheader_filename = "gmime/gmime.h", cname = "g_mime_utils_decode_message_id")]
-	public static unowned string utils_decode_message_id (string message_id);
+	public static string utils_decode_message_id (string message_id);
 	[CCode (cheader_filename = "gmime/gmime.h", cname = "g_mime_utils_generate_message_id")]
-	public static unowned string utils_generate_message_id (string fqdn);
+	public static string utils_generate_message_id (string fqdn);
 	[CCode (cheader_filename = "gmime/gmime.h", cname = "g_mime_utils_header_decode_date")]
 	public static time_t utils_header_decode_date (string str, out unowned int? tz_offset);
 	[CCode (cheader_filename = "gmime/gmime.h", cname = "g_mime_utils_header_decode_phrase")]
@@ -1356,25 +1358,25 @@ namespace GMime {
 	[CCode (cheader_filename = "gmime/gmime.h", cname = "g_mime_utils_header_decode_text")]
 	public static string utils_header_decode_text (string text);
 	[CCode (cheader_filename = "gmime/gmime.h", cname = "g_mime_utils_header_encode_phrase")]
-	public static unowned string utils_header_encode_phrase (string phrase);
+	public static string utils_header_encode_phrase (string phrase);
 	[CCode (cheader_filename = "gmime/gmime.h", cname = "g_mime_utils_header_encode_text")]
-	public static unowned string utils_header_encode_text (string text);
+	public static string utils_header_encode_text (string text);
 	[CCode (cheader_filename = "gmime/gmime.h", cname = "g_mime_utils_header_fold")]
-	public static unowned string utils_header_fold (string str);
+	public static string utils_header_fold (string header);
 	[CCode (cheader_filename = "gmime/gmime.h", cname = "g_mime_utils_header_format_date")]
-	public static unowned string utils_header_format_date (ulong date, int tz_offset);
+	public static string utils_header_format_date (ulong date, int tz_offset);
 	[CCode (cheader_filename = "gmime/gmime.h", cname = "g_mime_utils_header_printf")]
-	public static unowned string utils_header_printf (string format);
+	public static string utils_header_printf (string format);
 	[CCode (cheader_filename = "gmime/gmime.h", cname = "g_mime_utils_quote_string")]
-	public static unowned string utils_quote_string (string str);
+	public static string utils_quote_string (string str);
 	[CCode (cheader_filename = "gmime/gmime.h", cname = "g_mime_utils_structured_header_fold")]
-	public static unowned string utils_structured_header_fold (string str);
+	public static string utils_structured_header_fold (string header);
 	[CCode (cheader_filename = "gmime/gmime.h", cname = "g_mime_utils_text_is_8bit")]
 	public static bool utils_text_is_8bit (uint text, size_t len);
 	[CCode (cheader_filename = "gmime/gmime.h", cname = "g_mime_utils_unquote_string")]
 	public static void utils_unquote_string (string str);
 	[CCode (cheader_filename = "gmime/gmime.h", cname = "g_mime_utils_unstructured_header_fold")]
-	public static unowned string utils_unstructured_header_fold (string str);
+	public static string utils_unstructured_header_fold (string header);
 	[CCode (cheader_filename = "gmime/gmime.h", cname = "g_mime_ydecode_step")]
 	public static size_t ydecode_step (uint inbuf, size_t inlen, uint outbuf, int state, uint32 pcrc, uint32 crc);
 	[CCode (cheader_filename = "gmime/gmime.h", cname = "g_mime_yencode_close")]
diff --git a/bindings/vapi/gmime-2.6/gmime-2.6.metadata b/bindings/vapi/gmime-2.6/gmime-2.6.metadata
index b565b101..9ee27016 100644
--- a/bindings/vapi/gmime-2.6/gmime-2.6.metadata
+++ b/bindings/vapi/gmime-2.6/gmime-2.6.metadata
@@ -26,10 +26,20 @@ g_mime_stream_mem_new_with_buffer.len hidden="1"
 g_mime_stream_read.buf is_array="1" type_name="uint8[]"
 g_mime_stream_read.len hidden="1"
 g_mime_utils_decode_8bit transfer_ownership="1"
+g_mime_utils_decode_message_id transfer_ownership="1"
+g_mime_utils_generate_message_id transfer_ownership="1"
 g_mime_utils_header_decode_date type_name="time_t"
 g_mime_utils_header_decode_date.tz_offset is_out="1" nullable="1"
 g_mime_utils_header_decode_phrase transfer_ownership="1"
 g_mime_utils_header_decode_text transfer_ownership="1"
+g_mime_utils_header_encode_phrase transfer_ownership="1"
+g_mime_utils_header_encode_text transfer_ownership="1"
+g_mime_utils_header_fold transfer_ownership="1"
+g_mime_utils_header_format_date transfer_ownership="1"
+g_mime_utils_header_printf transfer_ownership="1"
+g_mime_utils_quote_string transfer_ownership="1"
+g_mime_utils_structured_header_fold transfer_ownership="1"
+g_mime_utils_unstructured_header_fold transfer_ownership="1"
 
 # FIXME: there is no keyword "is_protected"
 GMimeFilter.backbuf type_name="char*" is_protected="1"