diff --git a/python-virtualenv.spec b/python-virtualenv.spec
index 46a5de6..2177dc8 100644
--- a/python-virtualenv.spec
+++ b/python-virtualenv.spec
@@ -1,6 +1,6 @@
 Name:          python-virtualenv
 Version:       20.4.0
-Release:       1mamba
+Release:       2mamba
 Summary:       Virtual Python Environment builder
 Group:         System/Libraries/Python
 Vendor:        openmamba
@@ -10,23 +10,20 @@ URL:           http://virtualenv.openplans.org
 Source:        http://pypi.debian.net/virtualenv/virtualenv-%{version}.tar.gz
 License:       MIT
 ## AUTOBUILDREQ-BEGIN
-BuildRequires: libpython-devel
+BuildRequires: libpython3-devel
 ## AUTOBUILDREQ-END
 BuildRequires: help2man
-#%if "%{?with_pyver}"
-#Requires:      python3 >= %python3_version
-#Requires:      libpython3-devel
-#Requires:      python-setuptools-py3
-#%else
-#Requires:      python >= %python_version
-#Requires:      libpython-devel
-#Requires:      python-setuptools
-#%endif
 Requires:      python3 >= %python3_version
 Requires:      libpython3-devel
+Requires:      python-appdirs-py3
+Requires:      python-distlib-py3
+Requires:      python-filelock-py3
+Requires:      python-importlib_metadata-py3
 Requires:      python-setuptools-py3
-Obsoletes:     python-virtualenv-py3
-Obsoletes:     python-virtualenv-py36
+Requires:      python-zipp-py3
+Provides:      python-virtualenv-py3
+Obsoletes:     python-virtualenv-py3 < 20.4.0
+Obsoletes:     python-virtualenv-py36 < 20.4.0
 BuildRoot:     %{_tmppath}/%{name}-%{version}-root
 BuildArch:     noarch
 
@@ -85,6 +82,9 @@ install -d %{buildroot}%{_mandir}/man1
 %defattr(-,root,root)
 
 %changelog
+* Mon Jan 25 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 20.4.0-2mamba
+- added missing requirements
+
 * Tue Jan 19 2021 Automatic Build System <autodist@mambasoft.it> 20.4.0-1mamba
 - automatic version update by autodist