diff --git a/certbot.spec b/certbot.spec
index e8dfcb1..eaca4be 100644
--- a/certbot.spec
+++ b/certbot.spec
@@ -1,6 +1,6 @@
 Name:          certbot
 Version:       0.25.1
-Release:       1mamba
+Release:       2mamba
 Summary:       A fully-featured, extensible client for the Let's Encrypt CA
 Group:         System/Libraries
 Vendor:        openmamba
@@ -36,6 +36,7 @@ Requires:      python-setuptools
 Requires:      python-funcsigs >= 1.0
 Requires:      python-argparse
 Requires:      python-josepy
+Requires:      python-requests-toolbelt
 Provides:      letsencrypt
 Obsoletes:     letsencrypt
 BuildRoot:     %{_tmppath}/%{name}-%{version}-root
@@ -80,6 +81,9 @@ _EOF
 #%{python_sitearch}/letsencrypt-%{version}-py*.egg-info/*
 
 %changelog
+* Sun Jul 01 2018 Silvan Calarco <silvan.calarco@mambasoft.it> 0.25.1-2mamba
+- require python-requests-toolbelt
+
 * Thu Jun 14 2018 Automatic Build System <autodist@mambasoft.it> 0.25.1-1mamba
 - automatic version update by autodist