diff --git a/src/main/java/dev/micle/xptools/config/OperationItem.java b/src/main/java/dev/micle/xptools/config/OperationItem.java
index 9e31cce..7f14629 100644
--- a/src/main/java/dev/micle/xptools/config/OperationItem.java
+++ b/src/main/java/dev/micle/xptools/config/OperationItem.java
@@ -3,13 +3,13 @@ package dev.micle.xptools.config;
 import dev.micle.xptools.util.EnumUtils;
 
 public class OperationItem {
-    private boolean isTag;
-    private String id;
-    private OperationType type;
-    private float min;
-    private float max;
-    private int priority;
-    private boolean isLast;
+    private final boolean isTag;
+    private final String id;
+    private final OperationType type;
+    private final float min;
+    private final float max;
+    private final int priority;
+    private final boolean isLast;
 
     public OperationItem(boolean isTag, String id, OperationType type, float min, float max, int priority, boolean isLast) {
         this.isTag = isTag;