diff --git a/CHANGELOG.md b/CHANGELOG.md
index 24a322febc6..fec737d28fa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -31,6 +31,7 @@
 * Fix #6081: Moved Java baseline from 8 (1.8) to 11
 * Fix #6138: Removed unused `io:fabric8:kubernetes-model` artifact
 * Fix #6156: Removed deprecated extension `io:fabric8:service-catalog`
+* Fix #6158: Removed deprecated methods from `io.fabric8.kubernetes.client.utils.IOHelpers`
 
 ### 6.13.4 (2024-09-25)
 
diff --git a/kubernetes-client-api/src/main/java/io/fabric8/kubernetes/client/utils/IOHelpers.java b/kubernetes-client-api/src/main/java/io/fabric8/kubernetes/client/utils/IOHelpers.java
index f02e9b81996..f8abc827a96 100644
--- a/kubernetes-client-api/src/main/java/io/fabric8/kubernetes/client/utils/IOHelpers.java
+++ b/kubernetes-client-api/src/main/java/io/fabric8/kubernetes/client/utils/IOHelpers.java
@@ -15,10 +15,6 @@
  */
 package io.fabric8.kubernetes.client.utils;
 
-import com.fasterxml.jackson.core.JsonProcessingException;
-import com.fasterxml.jackson.databind.JsonNode;
-import com.fasterxml.jackson.databind.ObjectMapper;
-
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStream;
@@ -28,8 +24,6 @@
 import java.io.Writer;
 import java.nio.charset.Charset;
 
-/**
- */
 public class IOHelpers {
   private IOHelpers() {
     throw new IllegalStateException("Utility class");
@@ -65,37 +59,4 @@ private static void copy(Reader reader, Writer writer) throws IOException {
     }
   }
 
-  /**
-   * @deprecated will be removed in future versions
-   */
-  @Deprecated
-  public static boolean isJSONValid(String json) {
-    try {
-      ObjectMapper objectMapper = Serialization.jsonMapper();
-      objectMapper.readTree(json);
-    } catch (JsonProcessingException e) {
-      return false;
-    }
-    return true;
-  }
-
-  /**
-   * @deprecated will be removed in future versions
-   */
-  @Deprecated
-  public static String convertYamlToJson(String yaml) {
-    return Serialization.asJson(Serialization.unmarshal(yaml, JsonNode.class));
-  }
-
-  /**
-   * @deprecated will be removed in future versions
-   */
-  @Deprecated
-  public static String convertToJson(String jsonOrYaml) {
-    if (isJSONValid(jsonOrYaml)) {
-      return jsonOrYaml;
-    }
-    return convertYamlToJson(jsonOrYaml);
-  }
-
 }