diff --git a/diffpdf.spec b/diffpdf.spec
index 4ee63f8..3c0ade8 100644
--- a/diffpdf.spec
+++ b/diffpdf.spec
@@ -1,50 +1,41 @@
 Name:          diffpdf
-Version:       1.1.4
-Release:       2mamba
+Version:       2.1.3.1
+Release:       1mamba
 Summary:       PDF files comparator
 Group:         Applications/Publishing
 Vendor:        openmamba
 Distribution:  openmamba
-Packager:      Stefano Cotta Ramusino <stefano.cotta@openmamba.org>
+Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
 URL:           http://www.qtrac.eu/diffpdf.html
-Source:        http://www.qtrac.eu/diffpdf-%{version}.tar.gz
+Source:        https://gitlab.com/eang/diffpdf.git/v%{version}/diffpdf-%{version}.tar.bz2
 Source1:       diffpdf.desktop
 License:       GPL
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
 BuildRequires: libgcc
-BuildRequires: libpoppler-qt4-devel
-BuildRequires: libqt4-devel
+BuildRequires: libpoppler-devel
+BuildRequires: libpoppler-qt5-devel
 BuildRequires: libstdc++6-devel
+BuildRequires: qt5-qtbase-devel
 ## AUTOBUILDREQ-END
-BuildRoot:     %{_tmppath}/%{name}-%{version}-root
 
 %description
 DiffPDF can compare two PDF files.
 It offers two comparison modes: Text and Appearance. 
 
+%debug_package
+
 %prep
 %setup -q
 
 %build
-%{_qt4_qmake}
-%make
+%cmake
+
+%cmake_build
 
 %install
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
-install -D -m 755 diffpdf %{buildroot}%{_bindir}/diffpdf
-
-# generate and install icons
-for f in 16 32; do
-   install -d %{buildroot}%{_datadir}/icons/hicolor/${f}x${f}/apps
-   convert images/icon.png -size ${f}x${f} \
-     %{buildroot}%{_datadir}/icons/hicolor/${f}x${f}/apps/diffpdf.png
-done
-
-# install desktop file
-desktop-file-install \
-  --dir=%{buildroot}%{_datadir}/applications \
-  %{S:1}
+%cmake_install
 
 %clean
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
@@ -52,12 +43,17 @@ desktop-file-install \
 %files
 %defattr(-,root,root)
 %{_bindir}/diffpdf
-%{_datadir}/icons/hicolor/*/apps/*.png
 %{_datadir}/applications/*.desktop
+%{_datadir}/icons/hicolor/*/apps/*.png
+%dir %{_docdir}/DiffPDF
+%{_docdir}/DiffPDF/*
+%{_mandir}/man1/diffpdf.1*
 %doc gpl-2.0.txt
-#%doc CHANGES README
 
 %changelog
+* Thu Aug 02 2018 Silvan Calarco <silvan.calarco@mambasoft.it> 2.1.3.1-1mamba
+- update to 2.1.3.1
+
 * Thu Jun 06 2013 Silvan Calarco <silvan.calarco@mambasoft.it> 1.1.4-2mamba
 - rebuilt with libpoppler 0.20.5