diff --git a/Dockerfile b/Dockerfile
index ad17ef7..a0794fc 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,8 @@
 FROM ubuntu:14.04
-MAINTAINER Paolo Mainardi <paolo@twinbit.it>
+MAINTAINER Paolo Mainardi <paolo.mainardi@sparkfabrik.com>
 ENV DEBIAN_FRONTEND noninteractive
 
-ENV SOLR_VERSION 4.10.2
+ENV SOLR_VERSION 4.10.4
 ENV SOLR solr-$SOLR_VERSION
 
 # install java and wget
diff --git a/conf/solrconfig.xml b/conf/solrconfig.xml
index 93907dc..63ccce5 100644
--- a/conf/solrconfig.xml
+++ b/conf/solrconfig.xml
@@ -596,7 +596,7 @@
          Recommend values of 1-2 for read-only slaves, higher for
          masters w/o cache warming.
       -->
-    <maxWarmingSearchers>2</maxWarmingSearchers>
+    <maxWarmingSearchers>4</maxWarmingSearchers>
 
   </query>