diff --git a/HMCLCore/src/main/java/org/jackhuang/hmcl/game/GameJavaVersion.java b/HMCLCore/src/main/java/org/jackhuang/hmcl/game/GameJavaVersion.java
index 5f5afda69..e02f9eafe 100644
--- a/HMCLCore/src/main/java/org/jackhuang/hmcl/game/GameJavaVersion.java
+++ b/HMCLCore/src/main/java/org/jackhuang/hmcl/game/GameJavaVersion.java
@@ -33,7 +33,7 @@ public final class GameJavaVersion {
     public static final GameJavaVersion LATEST = JAVA_21;
 
     public static GameJavaVersion getMinimumJavaVersion(GameVersionNumber gameVersion) {
-        if (gameVersion.compareTo("1.21") >= 0)
+        if (gameVersion.compareTo("1.20.5") >= 0)
             return JAVA_21;
         if (gameVersion.compareTo("1.18") >= 0)
             return JAVA_17;
@@ -59,21 +59,6 @@ public final class GameJavaVersion {
         }
     }
 
-    public static boolean isSupportedPlatform(Platform platform) {
-        OperatingSystem os = platform.getOperatingSystem();
-        Architecture arch = platform.getArchitecture();
-        switch (arch) {
-            case X86:
-                return os == OperatingSystem.WINDOWS || os == OperatingSystem.LINUX;
-            case X86_64:
-                return os == OperatingSystem.WINDOWS || os == OperatingSystem.LINUX || os == OperatingSystem.OSX;
-            case ARM64:
-                return os == OperatingSystem.WINDOWS || os == OperatingSystem.OSX;
-            default:
-                return false;
-        }
-    }
-
     public static List<GameJavaVersion> getSupportedVersions(Platform platform) {
         OperatingSystem operatingSystem = platform.getOperatingSystem();
         Architecture architecture = platform.getArchitecture();