diff --git a/README.md b/README.md
index 47e3c5fc744730c4fb927d428d4669ea3e139095..318b3c02117165fd1ac6e24730a209771baf2759 100644
--- a/README.md
+++ b/README.md
@@ -72,14 +72,14 @@ mqtt:
     keepalive: 60
 bridge:
   # ping pong
-  - factory: "mqtt_bridge.bridge:RosToMqttBridge"
-    msg_type: "std_msgs.msg:Bool"
-    topic_from: "/ping"
-    topic_to: "ping"
-  - factory: "mqtt_bridge.bridge:MqttToRosBridge"
-    msg_type: "std_msgs.msg:Bool"
-    topic_from: "ping"
-    topic_to: "/pong"
+  - factory: mqtt_bridge.bridge:RosToMqttBridge
+    msg_type: std_msgs.msg:Bool
+    topic_from: /ping
+    topic_to: ping
+  - factory: mqtt_bridge.bridge:MqttToRosBridge
+    msg_type: std_msgs.msg:Bool
+    topic_from: ping
+    topic_to: /pong
 ```
 
 launch file:
@@ -115,8 +115,8 @@ See `mqtt_bridge.mqtt_client` for detail.
 `mqtt_bridge` uses `json` as a selializer in default. But you can also configure other selializers. For example, if you want to use messagepack for selialization, add following configuration.
 
 ``` yaml
-selializer: "msgpack:dumps"
-deselializer: "msgpack:loads"
+selializer: msgpack:dumps
+deselializer: msgpack:loads
 ```
 
 ### bridges
@@ -126,14 +126,14 @@ You can list ROS <--> MQTT tranfer specifications in following format.
 ``` yaml
 bridge:
   # ping pong
-  - factory: "mqtt_bridge.bridge:RosToMqttBridge"
-    msg_type: "std_msgs.msg:Bool"
-    topic_from: "/ping"
-    topic_to: "ping"
-  - factory: "mqtt_bridge.bridge:MqttToRosBridge"
-    msg_type: "std_msgs.msg:Bool"
-    topic_from: "ping"
-    topic_to: "/pong"
+  - factory: mqtt_bridge.bridge:RosToMqttBridge
+    msg_type: std_msgs.msg:Bool
+    topic_from: /ping
+    topic_to: ping
+  - factory: mqtt_bridge.bridge:MqttToRosBridge
+    msg_type: std_msgs.msg:Bool
+    topic_from: ping
+    topic_to: /pong
 ```
 
 * `factory`: bridge class for transfering message from ROS to MQTT, and vise versa.
diff --git a/config/demo_params.yaml b/config/demo_params.yaml
index d0abc5f13ee2d0c669841e4ebe14aa21d626887f..e6fa3de44cf5442213dad2f49b85e9f12c22dfa3 100644
--- a/config/demo_params.yaml
+++ b/config/demo_params.yaml
@@ -5,24 +5,24 @@ mqtt:
     host: localhost
     port: 1883
     keepalive: 60
-selializer: "msgpack:dumps"
-deselializer: "msgpack:loads"
+selializer: msgpack:dumps
+deselializer: msgpack:loads
 bridge:
   # ping pong
-  - factory: "mqtt_bridge.bridge:RosToMqttBridge"
-    msg_type: "std_msgs.msg:Bool"
-    topic_from: "/ping"
-    topic_to: "ping"
-  - factory: "mqtt_bridge.bridge:MqttToRosBridge"
-    msg_type: "std_msgs.msg:Bool"
-    topic_from: "ping"
-    topic_to: "/pong"
+  - factory: mqtt_bridge.bridge:RosToMqttBridge
+    msg_type: std_msgs.msg:Bool
+    topic_from: /ping
+    topic_to: ping
+  - factory: mqtt_bridge.bridge:MqttToRosBridge
+    msg_type: std_msgs.msg:Bool
+    topic_from: ping
+    topic_to: /pong
   # echo back
-  - factory: "mqtt_bridge.bridge:RosToMqttBridge"
-    msg_type: "std_msgs.msg:String"
-    topic_from: "/echo"
-    topic_to: "echo"
-  - factory: "mqtt_bridge.bridge:MqttToRosBridge"
-    msg_type: "std_msgs.msg:String"
-    topic_from: "echo"
-    topic_to: "/back"
+  - factory: mqtt_bridge.bridge:RosToMqttBridge
+    msg_type: std_msgs.msg:String
+    topic_from: /echo
+    topic_to: echo
+  - factory: mqtt_bridge.bridge:MqttToRosBridge
+    msg_type: std_msgs.msg:String
+    topic_from: echo
+    topic_to: /back