diff --git a/src/main/java/io/github/amithkoujalgi/ollama4j/core/OllamaAPI.java b/src/main/java/io/github/amithkoujalgi/ollama4j/core/OllamaAPI.java
index 08f80b2..01a4ee6 100644
--- a/src/main/java/io/github/amithkoujalgi/ollama4j/core/OllamaAPI.java
+++ b/src/main/java/io/github/amithkoujalgi/ollama4j/core/OllamaAPI.java
@@ -17,7 +17,10 @@ import org.apache.hc.core5.http.io.entity.StringEntity;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.io.*;
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
 import java.net.HttpURLConnection;
 import java.net.URL;
 import java.nio.charset.StandardCharsets;
@@ -281,8 +284,8 @@ public class OllamaAPI {
         con.setRequestMethod("POST");
         con.setDoOutput(true);
         con.setRequestProperty("Content-Type", "application/json");
-        try (DataOutputStream wr = new DataOutputStream(con.getOutputStream())) {
-            wr.writeBytes(ollamaRequestModel.toString());
+        try (OutputStream out = con.getOutputStream()) {
+            out.write(ollamaRequestModel.toString().getBytes(StandardCharsets.UTF_8));
         }
         OllamaAsyncResultCallback ollamaAsyncResultCallback = new OllamaAsyncResultCallback(con);
         ollamaAsyncResultCallback.start();