diff --git a/chromium.spec b/chromium.spec
index 736a262..07f3287 100644
--- a/chromium.spec
+++ b/chromium.spec
@@ -1,7 +1,7 @@
 Name:          chromium
 Epoch:         3
 Version:       53.0.2785.154
-Release:       1mamba
+Release:       2mamba
 Summary:       An open-source browser project that aims to build a safer, faster, and more stable way to experience the web
 Group:         Graphical Desktop/Applications/Internet
 Vendor:        openmamba
@@ -464,6 +464,9 @@ fi
 %{_mandir}/man1/chromium.1*
 
 %changelog
+* Tue Apr 18 2017 Silvan Calarco <silvan.calarco@mambasoft.it> 53.0.2785.154-2mamba
+- rebuilt to workaround certificate expiration bug
+
 * Wed Feb 15 2017 Silvan Calarco <silvan.calarco@mambasoft.it> 53.0.2785.154-1mamba
 - update to 53.0.2785.154