diff --git a/desktop/toolkit/gtk/gtkmm4/pspec.xml b/desktop/toolkit/gtk/gtkmm4/pspec.xml
index 62739f531d..410c84cd32 100644
--- a/desktop/toolkit/gtk/gtkmm4/pspec.xml
+++ b/desktop/toolkit/gtk/gtkmm4/pspec.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" ?>
-<!DOCTYPE PISI SYSTEM "http://www.pisilinux.org/projeler/pisi/pisi-spec.dtd">
+<!DOCTYPE PISI SYSTEM "https://www.pisilinux.org/projeler/pisi/pisi-spec.dtd">
 <PISI>
     <Source>
         <Name>gtkmm4</Name>
@@ -12,13 +12,12 @@
         <IsA>library</IsA>
         <Summary>C++ binding for GTK+</Summary>
         <Description>gtkmm is the official C++ interface for the popular GUI library GTK+. Highlights include typesafe callbacks, and a comprehensive set of widgets that are easily extensible via inheritance.</Description>
-        <Archive sha1sum="bd53c655c6bf5555e5651389a00d9801db1b14c8" type="tarxz">http://ftp.gnome.org/pub/GNOME/sources/gtkmm/4.18/gtkmm-4.18.0.tar.xz</Archive>
+        <Archive sha1sum="2b32453783d8442ce4d983939ab4d1d93b267921" type="tarxz">http://ftp.gnome.org/pub/GNOME/sources/gtkmm/4.20/gtkmm-4.20.0.tar.xz</Archive>
         <BuildDependencies>
             <Dependency>meson</Dependency>
             <Dependency>doxygen</Dependency>
             <Dependency>gtk4-devel</Dependency>
             <Dependency>libxslt-devel</Dependency>
-<!--             <Dependency>atkmm-devel</Dependency> -->
             <Dependency>glibmm-2.68-devel</Dependency>
             <Dependency>cairomm16-devel</Dependency>
             <Dependency>mm-common</Dependency>
@@ -32,7 +31,6 @@
         <RuntimeDependencies>
             <Dependency>gtk4</Dependency>
             <Dependency>cairo</Dependency>
-<!--             <Dependency>atkmm</Dependency> -->
             <Dependency>glib2</Dependency>
             <Dependency>glibmm-2.68</Dependency>
             <Dependency>graphene</Dependency>
@@ -71,6 +69,13 @@
     </Package>
 
     <History>
+        <Update release="5">
+            <Date>2025-10-14</Date>
+            <Version>4.20.0</Version>
+            <Comment>Version bump.</Comment>
+            <Name>Pisi Linux Community</Name>
+            <Email>admin@pisilinux.org</Email>
+        </Update>
         <Update release="4">
             <Date>2025-04-06</Date>
             <Version>4.18.0</Version>