diff --git a/json-core/src/main/java/io/avaje/json/JsonDataException.java b/json-core/src/main/java/io/avaje/json/JsonDataException.java
index 4fe1795d..ea92d385 100644
--- a/json-core/src/main/java/io/avaje/json/JsonDataException.java
+++ b/json-core/src/main/java/io/avaje/json/JsonDataException.java
@@ -20,7 +20,7 @@
  */
 public class JsonDataException extends JsonException {
 
-  static final long serialVersionUID = 1L;
+  private static final long serialVersionUID = 1L;
 
   public JsonDataException(String message) {
     super(message);
diff --git a/json-core/src/main/java/io/avaje/json/JsonEofException.java b/json-core/src/main/java/io/avaje/json/JsonEofException.java
index 2c4b878e..1554c01c 100644
--- a/json-core/src/main/java/io/avaje/json/JsonEofException.java
+++ b/json-core/src/main/java/io/avaje/json/JsonEofException.java
@@ -7,7 +7,7 @@
  */
 public class JsonEofException extends JsonIoException {
 
-  static final long serialVersionUID = 1L;
+  private static final long serialVersionUID = 1L;
 
   public JsonEofException(IOException cause) {
     super(cause);
diff --git a/json-core/src/main/java/io/avaje/json/JsonException.java b/json-core/src/main/java/io/avaje/json/JsonException.java
index 987eaab1..a9200fad 100644
--- a/json-core/src/main/java/io/avaje/json/JsonException.java
+++ b/json-core/src/main/java/io/avaje/json/JsonException.java
@@ -21,7 +21,7 @@
  */
 public class JsonException extends RuntimeException {
 
-  static final long serialVersionUID = 1L;
+  private static final long serialVersionUID = 1L;
 
   public JsonException(String message) {
     super(message);
diff --git a/json-core/src/main/java/io/avaje/json/JsonIoException.java b/json-core/src/main/java/io/avaje/json/JsonIoException.java
index 049e4122..e0ee5447 100644
--- a/json-core/src/main/java/io/avaje/json/JsonIoException.java
+++ b/json-core/src/main/java/io/avaje/json/JsonIoException.java
@@ -22,7 +22,7 @@
  */
 public class JsonIoException extends JsonException {
 
-  static final long serialVersionUID = 1L;
+  private static final long serialVersionUID = 1L;
 
   public JsonIoException(IOException cause) {
     super(cause);