diff --git a/python-six.spec b/python-six.spec
index 7f3d002..fbd9e09 100644
--- a/python-six.spec
+++ b/python-six.spec
@@ -1,6 +1,6 @@
 Name:          python-six
 Version:       1.12.0
-Release:       1mamba
+Release:       2mamba
 Summary:       Python 2 and 3 compatibility utilities
 Group:         System/Libraries
 Vendor:        openmamba
@@ -12,6 +12,7 @@ License:       MIT
 ## AUTOBUILDREQ-BEGIN
 ## AUTOBUILDREQ-END
 BuildRequires: libpython-devel
+BuildRequires: libpython3-devel >= 3.7.4
 Requires:      python >= %python_version
 BuildArch:     noarch
 BuildRoot:     %{_tmppath}/%{name}-%{version}-root
@@ -46,6 +47,9 @@ CFLAGS="%{optflags}" %{__python} setup.py build
 %doc LICENSE documentation/index.rst
 
 %changelog
+* Fri Aug 09 2019 Silvan Calarco <silvan.calarco@mambasoft.it> 1.12.0-2mamba
+- rebuilt with python3 3.7.4
+
 * Fri Aug 02 2019 Silvan Calarco <silvan.calarco@mambasoft.it> 1.12.0-1mamba
 - update to 1.12.0