diff --git a/app/build.gradle b/app/build.gradle
index 286def0f..fa74a37e 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -17,7 +17,7 @@ android {
         minSdk 24
         targetSdk sdk
         versionCode gitCommitCount
-        versionName '2.8.4'
+        versionName '2.8.5'
 
         testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
         externalNativeBuild {
diff --git a/app/src/main/java/gm/tieba/tabswitch/hooker/auto/AutoSign.java b/app/src/main/java/gm/tieba/tabswitch/hooker/auto/AutoSign.java
index 5b398851..ae94b860 100644
--- a/app/src/main/java/gm/tieba/tabswitch/hooker/auto/AutoSign.java
+++ b/app/src/main/java/gm/tieba/tabswitch/hooker/auto/AutoSign.java
@@ -8,7 +8,6 @@
 import org.json.JSONObject;
 
 import java.net.URLEncoder;
-import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.Iterator;
@@ -114,7 +113,7 @@ private void runSign() {
                 final Iterator<String> iterator = mFollow.iterator();
                 while (iterator.hasNext()) {
                     final String s = iterator.next();
-                    final String body = "kw=" + URLEncoder.encode(s, StandardCharsets.UTF_8) + "&tbs=" + mTbs + "&sign=" +
+                    final String body = "kw=" + URLEncoder.encode(s, "UTF-8") + "&tbs=" + mTbs + "&sign=" +
                             AutoSignHelper.enCodeMd5("kw=" + s + "tbs=" + mTbs + "tiebaclient!!!");
                     final JSONObject post = AutoSignHelper.post(SIGN_URL, body);
                     if ("0".equals(post.getString("error_code"))) {