diff --git a/src/main/java/com/ntlab/irisserver/entities/Turn.java b/src/main/java/com/ntlab/irisserver/entities/Turn.java
index 63bd815..7021417 100644
--- a/src/main/java/com/ntlab/irisserver/entities/Turn.java
+++ b/src/main/java/com/ntlab/irisserver/entities/Turn.java
@@ -15,7 +15,7 @@
     private String team;
 
     @JsonProperty("max")
-    private int max;
+    private Integer max;
 
     @JsonProperty("turnstate")
     private int turnstate; //0:スパイマスターのターン 1:諜報員のターン