diff --git a/debian/noosfero.postinst b/debian/noosfero.postinst
index 21c6dad..3dfe077 100644
--- a/debian/noosfero.postinst
+++ b/debian/noosfero.postinst
@@ -9,6 +9,26 @@ makedir() {
   chown noosfero:noosfero $1
 }
 
+
+# migrate mongrel configuration to thin
+mongrel_config=/etc/noosfero/mongrel_cluster.yml
+thin_config=/etc/noosfero/thin.yml
+mongrel_orig_sha1=602c642c03f79349969c08330112a6f29d4c32aa
+if [ -r $mongrel_config ]; then
+  mongrel_sha1=$(sha1sum $mongrel_config | awk '{print $1}')
+  if [ "$mongrel_sha1" != "$mongrel_orig_sha1" ]; then
+    port=$(awk '{ if ($1 == "port:") { print($2) } }' $mongrel_config)
+    servers=$(awk '{ if ($1 == "servers:") { print($2) } }' $mongrel_config)
+    if test -n "$port"  && test "$port" -ne 50000  || test -n "$servers" && test "$servers" -ne 1 ; then
+      # mongrel configuration was changed; update thin configuration
+      # accordingly
+      sed -i -e "s/port: .*/port: $port/" $thin_config
+      sed -i -e "s/servers: .*/servers: $servers/" $thin_config
+    fi
+  fi
+  mv $mongrel_config $mongrel_config.bak
+fi
+
 # create user noosfero in a portable way, while creating the log directory.
 # (idea taken from the postfix package)
 ##############################################################################
--
libgit2 0.21.2