diff --git a/programming/language/vala/files/glib2-78.patch b/programming/language/vala/files/glib2-78.patch
new file mode 100644
index 0000000000..a8af4e9ad3
--- /dev/null
+++ b/programming/language/vala/files/glib2-78.patch
@@ -0,0 +1,111 @@
+From 559fed5ba9dc59d082287494f9b3d4e154bbf331 Mon Sep 17 00:00:00 2001
+From: Lorenz Wildberg <lorenz@wild-fisch.de>
+Date: Sun, 24 Sep 2023 19:30:13 +0200
+Subject: [PATCH] glib-2.0: Add new symbols from 2.78
+
+---
+ vapi/glib-2.0.vapi | 13 +++++++++++++
+ 1 file changed, 13 insertions(+)
+
+diff --git a/vapi/glib-2.0.vapi b/vapi/glib-2.0.vapi
+index 55f1a7b2c..ee14f186a 100644
+--- a/vapi/glib-2.0.vapi
++++ b/vapi/glib-2.0.vapi
+@@ -1328,6 +1328,9 @@ public class string {
+ 	public string make_valid (ssize_t len = -1);
+ 	[CCode (cname = "g_utf8_normalize")]
+ 	public string normalize (ssize_t len = -1, GLib.NormalizeMode mode = GLib.NormalizeMode.DEFAULT);
++	[Version (since = "2.78")]
++	[CCode (cname = "g_utf8_truncate_middle")]
++	public string truncate_middle (size_t truncate_length);
+ 
+ 	[CCode (cname = "g_utf8_strup")]
+ 	public string up (ssize_t len = -1);
+@@ -2045,6 +2048,8 @@ namespace GLib {
+ 		public static uint add_seconds (uint interval, owned SourceFunc function, [CCode (pos = 0.1)] int priority = Priority.DEFAULT);
+ 		[Version (since = "2.14")]
+ 		public static uint add_seconds_full (int priority, uint interval, owned SourceFunc function);
++		[Version (since = "2.78")]
++		public static uint add_seconds_once (uint interval, SourceOnceFunc function);
+ 	}
+ 
+ 	[CCode (cname = "GSource")]
+@@ -5056,6 +5061,8 @@ namespace GLib {
+ 		public static double rand_double_range (double begin, double end);
+ 		[Version (since = "2.22")]
+ 		public static void log_set_fatal_handler (LogFatalFunc log_func);
++		[Version (since = "2.78")]
++		public static void disable_crash_reporting ();
+ 
+ 		public delegate bool LogFatalFunc (string? log_domain, LogLevelFlags log_levels, string message);
+ 	}
+@@ -5714,8 +5721,13 @@ namespace GLib {
+ 	[CCode (cname = "GString", cprefix = "g_string_", free_function = "g_string_free", type_id = "G_TYPE_GSTRING")]
+ 	public class StringBuilder {
+ 		public StringBuilder (string init = "");
++		[CCode (cname = "g_string_new_len")]
++		public StringBuilder.from_buffer ([CCode (array_length_type = "gssize")] char[] init);
+ 		[CCode (cname = "g_string_sized_new")]
+ 		public StringBuilder.sized (size_t dfl_size);
++		[Version (since = "2.78")]
++		[CCode (cname = "g_string_new_take")]
++		public StringBuilder.take (owned string init);
+ 		public unowned StringBuilder assign (string rval);
+ 		public unowned StringBuilder append (string val);
+ 		public unowned StringBuilder append_c (char c);
+@@ -6368,6 +6380,7 @@ namespace GLib {
+ 		public const uint @2_72;
+ 		public const uint @2_74;
+ 		public const uint @2_76;
++		public const uint @2_78;
+ 
+ 		[CCode (cname = "glib_binary_age")]
+ 		public const uint binary_age;
+-- 
+GitLab
+
+diff --git a/vala/valamarkupreader.vala b/vala/valamarkupreader.vala
+index 3ad25e045..6a290eb95 100644
+--- a/vala/valamarkupreader.vala
++++ b/vala/valamarkupreader.vala
+@@ -239,32 +239,34 @@ public class Vala.MarkupReader {
+ 				Report.error (null, "invalid UTF-8 character");
+ 			} else if (u == '&') {
+ 				char* next_pos = current + u.to_utf8 (null);
+-				if (((string) next_pos).has_prefix ("amp;")) {
++				char buffer[16];
++				Memory.copy (buffer, next_pos, (end - next_pos >= buffer.length ? buffer.length - 1 : end - next_pos));
++				if (((string) buffer).has_prefix ("amp;")) {
+ 					content.append (((string) text_begin).substring (0, (int) (current - text_begin)));
+ 					content.append_c ('&');
+ 					current += 5;
+ 					text_begin = current;
+-				} else if (((string) next_pos).has_prefix ("quot;")) {
++				} else if (((string) buffer).has_prefix ("quot;")) {
+ 					content.append (((string) text_begin).substring (0, (int) (current - text_begin)));
+ 					content.append_c ('"');
+ 					current += 6;
+ 					text_begin = current;
+-				} else if (((string) next_pos).has_prefix ("apos;")) {
++				} else if (((string) buffer).has_prefix ("apos;")) {
+ 					content.append (((string) text_begin).substring (0, (int) (current - text_begin)));
+ 					content.append_c ('\'');
+ 					current += 6;
+ 					text_begin = current;
+-				} else if (((string) next_pos).has_prefix ("lt;")) {
++				} else if (((string) buffer).has_prefix ("lt;")) {
+ 					content.append (((string) text_begin).substring (0, (int) (current - text_begin)));
+ 					content.append_c ('<');
+ 					current += 4;
+ 					text_begin = current;
+-				} else if (((string) next_pos).has_prefix ("gt;")) {
++				} else if (((string) buffer).has_prefix ("gt;")) {
+ 					content.append (((string) text_begin).substring (0, (int) (current - text_begin)));
+ 					content.append_c ('>');
+ 					current += 4;
+ 					text_begin = current;
+-				} else if (((string) next_pos).has_prefix ("percnt;")) {
++				} else if (((string) buffer).has_prefix ("percnt;")) {
+ 					content.append (((string) text_begin).substring (0, (int) (current - text_begin)));
+ 					content.append_c ('%');
+ 					current += 8;
diff --git a/programming/language/vala/pspec.xml b/programming/language/vala/pspec.xml
index d79bbda382..defaa9f5ed 100644
--- a/programming/language/vala/pspec.xml
+++ b/programming/language/vala/pspec.xml
@@ -20,6 +20,9 @@
             <Dependency>libxslt-devel</Dependency>
             <Dependency>dbus-devel</Dependency>
         </BuildDependencies>
+        <Patches>
+            <Patch level="1">glib2-78.patch</Patch>
+        </Patches>
     </Source>
 
     <Package>
@@ -72,6 +75,13 @@
     </Package>
 
     <History>
+        <Update release="34">
+            <Date>2023-10-13</Date>
+            <Version>0.56.13</Version>
+            <Comment>Rebuild.</Comment>
+            <Name>Mustafa Cinasal</Name>
+            <Email>muscnsl@gmail.com</Email>
+        </Update>
         <Update release="33">
             <Date>2023-09-03</Date>
             <Version>0.56.13</Version>