diff --git a/app/src/mobile/java/com/fongmi/android/tv/ui/fragment/VodFragment.java b/app/src/mobile/java/com/fongmi/android/tv/ui/fragment/VodFragment.java
index 9c7426e6a..e70d271eb 100644
--- a/app/src/mobile/java/com/fongmi/android/tv/ui/fragment/VodFragment.java
+++ b/app/src/mobile/java/com/fongmi/android/tv/ui/fragment/VodFragment.java
@@ -54,6 +54,7 @@ import com.github.catvod.net.OkHttp;
 import com.github.catvod.utils.Trans;
 import com.google.common.net.HttpHeaders;
 import com.permissionx.guolindev.PermissionX;
+import java.security.SecureRandom;
 
 import org.greenrobot.eventbus.EventBus;
 import org.greenrobot.eventbus.Subscribe;
@@ -161,7 +162,7 @@ public class VodFragment extends BaseFragment implements SiteCallback, FilterCal
     private void updateHot() {
         App.post(mRunnable, 10 * 1000);
         if (mHots.isEmpty() || mHots.size() < 10) return;
-        mBinding.hot.setText(mHots.get(new Random().nextInt(11)));
+        mBinding.hot.setText(mHots.get(new SecureRandom().nextInt(11)));
     }
 
     private Result handle(Result result) {
diff --git a/quickjs/src/main/java/com/fongmi/quickjs/utils/Connect.java b/quickjs/src/main/java/com/fongmi/quickjs/utils/Connect.java
index b6ac1fecc..5fcb6691e 100644
--- a/quickjs/src/main/java/com/fongmi/quickjs/utils/Connect.java
+++ b/quickjs/src/main/java/com/fongmi/quickjs/utils/Connect.java
@@ -7,6 +7,7 @@ import com.github.catvod.utils.Util;
 import com.google.common.net.HttpHeaders;
 import com.whl.quickjs.wrapper.JSObject;
 import com.whl.quickjs.wrapper.QuickJSContext;
+import java.security.SecureRandom;
 
 import java.util.List;
 import java.util.Map;
@@ -84,7 +85,7 @@ public class Connect {
     }
 
     private static RequestBody getFormDataBody(Req req) {
-        String boundary = "--dio-boundary-" + new Random().nextInt(42949) + "" + new Random().nextInt(67296);
+        String boundary = "--dio-boundary-" + new SecureRandom().nextInt(42949) + "" + new SecureRandom().nextInt(67296);
         MultipartBody.Builder builder = new MultipartBody.Builder(boundary).setType(MultipartBody.FORM);
         Map<String, String> params = Json.toMap(req.getData());
         for (String key : params.keySet()) builder.addFormDataPart(key, params.get(key));
diff --git a/thunder/src/main/java/com/xunlei/downloadlib/android/XLUtil.java b/thunder/src/main/java/com/xunlei/downloadlib/android/XLUtil.java
index 848663c96..05dc6226d 100644
--- a/thunder/src/main/java/com/xunlei/downloadlib/android/XLUtil.java
+++ b/thunder/src/main/java/com/xunlei/downloadlib/android/XLUtil.java
@@ -1,6 +1,7 @@
 package com.xunlei.downloadlib.android;
 
 import android.util.Base64;
+import java.security.SecureRandom;
 
 import java.util.Random;
 import java.util.UUID;
@@ -22,7 +23,7 @@ public class XLUtil {
     }
 
     private static String random(String base, int length) {
-        Random random = new Random();
+        Random random = new SecureRandom();
         StringBuilder sb = new StringBuilder();
         for (int i = 0; i < length; i++) sb.append(base.charAt(random.nextInt(base.length())));
         return sb.toString();