diff --git a/desktop/lookandfeel/gtk-theme-greybird/actions.py b/desktop/lookandfeel/gtk-theme-greybird/actions.py
index 254a353885..faa05315eb 100644
--- a/desktop/lookandfeel/gtk-theme-greybird/actions.py
+++ b/desktop/lookandfeel/gtk-theme-greybird/actions.py
@@ -2,18 +2,19 @@
 # -*- coding: utf-8 -*-
 #
 # Licensed under the GNU General Public License, version 3.
-# See the file http://www.gnu.org/licenses/gpl.txt
+# See the file https://www.gnu.org/licenses/gpl-3.0.txt
 
-from pisi.actionsapi import shelltools
-from pisi.actionsapi import get
-from pisi.actionsapi import autotools
+from pisi.actionsapi import mesontools
 from pisi.actionsapi import pisitools
 
-	
+def setup():
+	mesontools.configure()
+
+def build():
+	mesontools.build()
+
 def install():
-    pisitools.dodir ("/usr/share/themes/Greybird")
+	mesontools.install()
 
-    for subtheme in ["gtk-2.0", "gtk-3.0", "metacity-1", "xfwm4"]:
-        pisitools.insinto ("/usr/share/themes/Greybird", subtheme)
+	pisitools.dodoc("LICENSE*", "README.md")
 
-    pisitools.dodoc ("LICENSE.CC", "LICENSE.GPL")
diff --git a/desktop/lookandfeel/gtk-theme-greybird/pspec.xml b/desktop/lookandfeel/gtk-theme-greybird/pspec.xml
index e04769f4c1..f24aee5c35 100644
--- a/desktop/lookandfeel/gtk-theme-greybird/pspec.xml
+++ b/desktop/lookandfeel/gtk-theme-greybird/pspec.xml
@@ -1,52 +1,71 @@
 <?xml version="1.0" ?> 
-<!DOCTYPE PISI SYSTEM "http://www.pisilinux.org/projeler/pisi/pisi-spec.dtd">
+<!DOCTYPE PISI SYSTEM "https://pisilinux.org/projeler/pisi/pisi-spec.dtd">
 <PISI>
-    <Source>
-        <Name>gtk-theme-greybird</Name>
-        <Homepage>http://shimmerproject.org/project/greybird/</Homepage>
-        <Packager>
-            <Name>Pisi Gnu/Linux Community</Name>
-            <Email>admin@pisilinux.org</Email>
-        </Packager>
-        <Summary>GTK Theme Suite - Greybird</Summary>
-        <Description>GTK Theme Suite - Greybird</Description>
-        <License>GPLv2</License>
-        <ISA>data</ISA>
-        <Archive sha1sum="f82b5ddf6452c39f1dae96541c14686bc791e0fc" type="targz">https://github.com/shimmerproject/Greybird/archive/v3.22.2.tar.gz</Archive>
-    </Source>
-    
-    <Package>
-        <Name>gtk-theme-greybird</Name>
-        <RuntimeDependencies>
-            <Dependency>gtk2-engines-murrine</Dependency>
-        </RuntimeDependencies>
-        <Files>
-            <Path fileType="data">/usr/share/themes</Path>
-            <Path fileType="doc">/usr/share/doc</Path>
-        </Files>
-    </Package>
-    
-    <History>
-        <Update release="3">
-            <Date>2018-08-31</Date>
-            <Version>3.22.2</Version>
-            <Comment>Rebuild New T.</Comment>
-            <Name>Mustafa Cinasal</Name>
-            <Email>muscnsl@gmail.com</Email>
-        </Update>
-        <Update release="2">
-            <Date>2017-04-06</Date>
-            <Version>3.22.2</Version>
-            <Comment>Rebuild with new toolchain</Comment>
-            <Name>Pisi Gnu/Linux Community</Name>
-            <Email>admin@pisilinux.org</Email>
-        </Update>
-        <Update release="1">
-            <Date>2016-09-08</Date>
-            <Version>1.5.3</Version>
-            <Comment>First Release</Comment>
-            <Name>Pisi Gnu/Linux Community</Name>
-            <Email>admin@pisilinux.org</Email>
-        </Update>
-    </History>
+	<Source>
+		<Name>gtk-theme-greybird</Name>
+		<Homepage>https://github.com/shimmerproject/Greybird</Homepage>
+		<Packager>
+			<Name>Pisi Gnu/Linux Community</Name>
+			<Email>admin@pisilinux.org</Email>
+		</Packager>
+		<Summary>Desktop Suite for Xfce.</Summary>
+		<Description>GTK Theme Suite - Greybird.</Description>
+		<License>GPLv2</License>
+		<License>CC-BY-SA</License>
+		<ISA>data</ISA>
+		<Archive sha1sum="2a7c5971fa06905987b771802501716ef374332c" type="targz">
+			https://github.com/shimmerproject/Greybird/archive/v3.22.12.tar.gz
+		</Archive>
+		<BuildDependencies>
+			<Dependency>meson</Dependency>
+			<Dependency>sassc</Dependency>
+			<Dependency>gtk3-devel</Dependency>
+			<Dependency>glib2-devel</Dependency>
+			<Dependency>librsvg-devel</Dependency>
+			<Dependency>gdk-pixbuf-devel</Dependency>
+		</BuildDependencies>
+	</Source>
+
+	<Package>
+		<Name>gtk-theme-greybird</Name>
+		<RuntimeDependencies>
+			<Dependency>gtk2-engines-murrine</Dependency>
+		</RuntimeDependencies>
+		<Files>
+			<Path fileType="data">/usr/share/themes</Path>
+			<Path fileType="doc">/usr/share/doc</Path>
+		</Files>
+	</Package>
+
+	<History>
+		<Update release="4">
+			<Date>2020-11-03</Date>
+			<Version>3.22.12</Version>
+			<Comment>Ver. bump</Comment>
+			<Name>fury</Name>
+			<Email>wascheme@tuta.io</Email>
+		</Update>
+		<Update release="3">
+			<Date>2018-08-31</Date>
+			<Version>3.22.2</Version>
+			<Comment>Rebuild New T.</Comment>
+			<Name>Mustafa Cinasal</Name>
+			<Email>muscnsl@gmail.com</Email>
+		</Update>
+		<Update release="2">
+			<Date>2017-04-06</Date>
+			<Version>3.22.2</Version>
+			<Comment>Rebuild with new toolchain</Comment>
+			<Name>Pisi Gnu/Linux Community</Name>
+			<Email>admin@pisilinux.org</Email>
+		</Update>
+		<Update release="1">
+			<Date>2016-09-08</Date>
+			<Version>1.5.3</Version>
+			<Comment>First Release</Comment>
+			<Name>Pisi Gnu/Linux Community</Name>
+			<Email>admin@pisilinux.org</Email>
+		</Update>
+	</History>
 </PISI>
+
diff --git a/desktop/lookandfeel/gtk-theme-greybird/translations.xml b/desktop/lookandfeel/gtk-theme-greybird/translations.xml
index d6dc20577d..b0c9e7b785 100644
--- a/desktop/lookandfeel/gtk-theme-greybird/translations.xml
+++ b/desktop/lookandfeel/gtk-theme-greybird/translations.xml
@@ -1,8 +1,8 @@
 <?xml version="1.0" ?>
 <PISI>
-    <Source>
-        <Name>gtk-theme-bluebird</Name>
-        <Summary xml:lang="en">GTK Theme Suite - Greybird</Summary>
-        <Description xml:lang="en">GTK Theme Suite - Greybird</Description>
-    </Source>
+	<Source>
+		<Name>gtk-theme-bluebird</Name>
+		<Summary xml:lang="en">GTK Theme Suite - Greybird</Summary>
+		<Description xml:lang="en">GTK Theme Suite - Greybird</Description>
+	</Source>
 </PISI>