diff --git a/src/main/java/com/mailgun/model/events/EventItem.java b/src/main/java/com/mailgun/model/events/EventItem.java
index 68b1b7a..e25a26c 100644
--- a/src/main/java/com/mailgun/model/events/EventItem.java
+++ b/src/main/java/com/mailgun/model/events/EventItem.java
@@ -175,7 +175,7 @@ public class EventItem {
      * </p>
      */
     @JsonProperty("user-variables")
-    Map<String, String> userVariables;
+    Map<String, Object> userVariables;
 
     /**
      * <p>