diff --git a/.travis.yml b/.travis.yml
index 0dec0fc..b4e3186 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,3 +14,4 @@ notifications:
       - "irc.freenode.net#chihaya"
     on_success: always
     on_failure: always
+  email: false
diff --git a/config/example.json b/config/example.json
index aa85f77..90c098f 100644
--- a/config/example.json
+++ b/config/example.json
@@ -4,7 +4,7 @@
   "addr": ":80",
 
   "cache": {
-    "driver": "redis",
+    "driver": "mock",
     "network": "tcp",
     "host": "127.0.0.1",
     "port": "6379",
@@ -17,7 +17,7 @@
   },
 
   "storage": {
-    "driver": "batter",
+    "driver": "gazelle",
     "host": "127.0.0.1",
     "port": "5432",
     "user": "postgres",
diff --git a/server/stats_test.go b/server/stats_test.go
index 55a4ed2..7b6dd2f 100644
--- a/server/stats_test.go
+++ b/server/stats_test.go
@@ -13,6 +13,7 @@ import (
 
 	"github.com/chihaya/chihaya/config"
 
+	_ "github.com/chihaya/chihaya-gazelle"
 	_ "github.com/chihaya/chihaya/storage/tracker/mock"
 )