diff --git a/HMCL/build.gradle b/HMCL/build.gradle
index d5c7d4f1e..85d38532f 100755
--- a/HMCL/build.gradle
+++ b/HMCL/build.gradle
@@ -38,11 +38,11 @@ def buildnumber = System.getenv("TRAVIS_BUILD_NUMBER")
 if (buildnumber == null)
 buildnumber = System.getenv("BUILD_NUMBER")
 if (buildnumber == null)
-buildnumber = "52"
+buildnumber = "60"
     
 def versionroot = System.getenv("VERSION_ROOT")
 if (versionroot == null)
-versionroot = "2.7.9"
+versionroot = "2.7.10"
 
 String mavenGroupId = 'HMCL'
 String mavenVersion = versionroot + '.' + buildnumber
diff --git a/HMCLAPI/src/main/java/org/jackhuang/hmcl/api/ComposedVersionNumber.java b/HMCLAPI/src/main/java/org/jackhuang/hmcl/api/ComposedVersionNumber.java
index 769d87acf..84d29528f 100644
--- a/HMCLAPI/src/main/java/org/jackhuang/hmcl/api/ComposedVersionNumber.java
+++ b/HMCLAPI/src/main/java/org/jackhuang/hmcl/api/ComposedVersionNumber.java
@@ -18,6 +18,7 @@
 package org.jackhuang.hmcl.api;
 
 import java.util.Arrays;
+import java.util.LinkedList;
 import java.util.List;
 import java.util.Objects;
 import java.util.stream.Collectors;
@@ -38,9 +39,9 @@ public final class ComposedVersionNumber extends VersionNumber {
     }
 
     ComposedVersionNumber(String version) {
-        composed = Arrays.stream(version.split("-"))
-                .map(VersionNumber::asVersion)
-                .collect(Collectors.toList());
+        String slice[] = version.split("-");
+        composed = new LinkedList<>();
+        for (String str : slice) composed.add(VersionNumber.asVersion(str));
     }
 
     @Override
@@ -50,6 +51,9 @@ public final class ComposedVersionNumber extends VersionNumber {
 
     @Override
     public String toString() {
-        return composed.stream().map(VersionNumber::toString).collect(Collectors.joining("-"));
+        List<String> seq = new LinkedList<>();
+        for (VersionNumber str : composed)
+            seq.add(str.toString());
+        return String.join("-", seq);
     }
 }
\ No newline at end of file
diff --git a/HMCLAPI/src/main/java/org/jackhuang/hmcl/api/IntVersionNumber.java b/HMCLAPI/src/main/java/org/jackhuang/hmcl/api/IntVersionNumber.java
index 76eaf487b..a6db44e90 100644
--- a/HMCLAPI/src/main/java/org/jackhuang/hmcl/api/IntVersionNumber.java
+++ b/HMCLAPI/src/main/java/org/jackhuang/hmcl/api/IntVersionNumber.java
@@ -20,7 +20,6 @@ package org.jackhuang.hmcl.api;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Objects;
-import java.util.stream.Collectors;
 
 /**
  * If a version string formats x.x.x.x, a {@code IntVersionNumber}
diff --git a/HMCLAPI/src/main/java/org/jackhuang/hmcl/api/VersionNumber.java b/HMCLAPI/src/main/java/org/jackhuang/hmcl/api/VersionNumber.java
index e11580458..2814f5ca4 100644
--- a/HMCLAPI/src/main/java/org/jackhuang/hmcl/api/VersionNumber.java
+++ b/HMCLAPI/src/main/java/org/jackhuang/hmcl/api/VersionNumber.java
@@ -36,13 +36,6 @@ public abstract class VersionNumber implements Comparable<VersionNumber> {
             return new StringVersionNumber(version);
     }
 
-    public static Optional<String> parseVersion(String str) {
-        if (IntVersionNumber.isIntVersionNumber(str))
-            return Optional.of(new IntVersionNumber(str).toString());
-        else
-            return Optional.empty();
-    }
-
     @Override
     public int compareTo(VersionNumber o) {
         return COMPARATOR.compare(this, o);