diff --git a/perl-Math-GMP.spec b/perl-Math-GMP.spec
index 86c7735..ae66862 100644
--- a/perl-Math-GMP.spec
+++ b/perl-Math-GMP.spec
@@ -1,20 +1,24 @@
 %define perl_major_ver %(eval `perl -V:version`; echo ${version%*.[0-9]*}.0)
 
 Name:          perl-Math-GMP
-Version:       2.04
-Release:       4mamba
+Version:       2.20
+Release:       1mamba
 Summary:       Math::GMP - High speed arbitrary size integer math
 Group:         Development/Libraries/Perl
 Vendor:        openmamba
 Distribution:  openmamba
 Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
-URL:           http://www.cpan.org
-Source:        http://www.cpan.org/authors/id/C/CH/CHIPT/Math-GMP-%{version}.tar.gz
+URL:           https://www.cpan.org
+Source:        https://cpan.metacpan.org/authors/id/S/SH/SHLOMIF/Math-GMP-%{version}.tar.gz
 License:       GPL
-BuildRequires: perl-devel >= %perl_major_ver
+## AUTOBUILDREQ-BEGIN
+BuildRequires: glibc-devel
 BuildRequires: libgmp-devel
+BuildRequires: libperl
+BuildRequires: perl-devel
+## AUTOBUILDREQ-END
+BuildRequires: perl-Alien-GMP
 Requires:      perl >= %perl_major_ver
-BuildRoot:     %{_tmppath}/perl-root
 
 %description
 Math::GMP gives you access to the fast GMP library for fast big integer math.
@@ -49,6 +53,9 @@ rm -f .packlist
 %defattr(-,root,root)
 
 %changelog
+* Wed May 19 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 2.20-1mamba
+- update to 2.20
+
 * Mon Nov 12 2012 Silvan Calarco <silvan.calarco@mambasoft.it> 2.04-4mamba
 - perl 5.16 mass rebuild