diff --git a/gradle.properties b/gradle.properties
index 2adf2fd..8927d97 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -4,7 +4,7 @@ org.gradle.jvmargs=-Xmx1G
 # check these on https://fabricmc.net/use
 minecraft_version=1.17.1
 yarn_mappings=1.17.1+build.10
-loader_version=0.11.6
+loader_version=0.12.1
 # Mod Properties
 mod_version=0.3.9-alpha.114514
 maven_group=com.plusls
diff --git a/src/main/java/com/plusls/ommc/OmmcCompatMixinPlugin.java b/src/main/java/com/plusls/ommc/OmmcCompatMixinPlugin.java
index 1aaebc1..8689b53 100644
--- a/src/main/java/com/plusls/ommc/OmmcCompatMixinPlugin.java
+++ b/src/main/java/com/plusls/ommc/OmmcCompatMixinPlugin.java
@@ -6,8 +6,9 @@
 import com.plusls.ommc.util.YarnUtil;
 import net.fabricmc.loader.api.FabricLoader;
 import net.fabricmc.loader.api.ModContainer;
+import net.fabricmc.loader.api.Version;
 import net.fabricmc.loader.api.VersionParsingException;
-import net.fabricmc.loader.util.version.VersionPredicateParser;
+import net.fabricmc.loader.impl.util.version.VersionPredicateParser;
 import org.apache.commons.io.FileUtils;
 import org.objectweb.asm.ClassWriter;
 import org.objectweb.asm.Type;
@@ -33,6 +34,8 @@ public class OmmcCompatMixinPlugin extends OmmcMixinPlugin {
     private final List<String> obfuscatedMixinList = new ArrayList<>();
     static private Path tempDirectory;
 
+    static private Method oldMatchesMethod;
+
     static {
         if (!FabricLoader.getInstance().isDevelopmentEnvironment()) {
             try {
@@ -42,6 +45,11 @@ public class OmmcCompatMixinPlugin extends OmmcMixinPlugin {
                 throw new IllegalStateException("Cannot create temp directory.");
             }
         }
+        try {
+            oldMatchesMethod = Class.forName("net.fabricmc.loader.util.version.VersionPredicateParser").getMethod("matches", Version.class, String.class);
+        } catch (ClassNotFoundException | NoSuchMethodException ignored) {
+        }
+
     }
     // private static final Gson GSON = new GsonBuilder().setPrettyPrinting().create();
 
@@ -139,7 +147,12 @@ public void onLoad(String mixinPackage) {
             Object urlLoader = Thread.currentThread().getContextClassLoader();
             Class<?> knotClassLoader;
             try {
-                knotClassLoader = Class.forName("net.fabricmc.loader.launch.knot.KnotClassLoader");
+                if (oldMatchesMethod == null) {
+                    knotClassLoader = Class.forName("net.fabricmc.loader.impl.launch.knot.KnotClassLoader");
+                } else {
+                    knotClassLoader = Class.forName("net.fabricmc.loader.launch.knot.KnotClassLoader");
+                }
+
             } catch (ClassNotFoundException e) {
                 e.printStackTrace();
                 throw new IllegalStateException("Cannot load class: net.fabricmc.loader.launch.knot.KnotClassLoader");
@@ -169,22 +182,29 @@ private void obfuscateClass(String classFullName) {
         }
     }
 
+
+    private boolean myMatches(Version version, String s) {
+        try {
+            if (oldMatchesMethod != null) {
+                return (boolean) oldMatchesMethod.invoke(null, version, s);
+            }
+            return VersionPredicateParser.parse(s).test(version);
+        } catch (VersionParsingException | InvocationTargetException | IllegalAccessException e) {
+            e.printStackTrace();
+            return false;
+        }
+    }
+
     private boolean checkDependency(String targerClassName, AnnotationNode dependency) {
         String modId = Annotations.getValue(dependency, "modId");
         Optional<ModContainer> modContainerOptional = FabricLoader.getInstance().getModContainer(modId);
         if (modContainerOptional.isPresent()) {
             ModContainer modContainer = modContainerOptional.get();
             List<String> versionList = Annotations.getValue(dependency, "version");
-            try {
-                for (String version : versionList) {
-                    // not work in fabric-loader 0.12
-                    if (!VersionPredicateParser.matches(modContainer.getMetadata().getVersion(), version)) {
-                        return false;
-                    }
+            for (String version : versionList) {
+                if (!myMatches(modContainer.getMetadata().getVersion(), version)) {
+                    return false;
                 }
-            } catch (VersionParsingException e) {
-                e.printStackTrace();
-                throw new IllegalStateException(String.format("VersionParsingException, modid=%s, version=%s", modId, versionList));
             }
             ClassNode targetClassNode;
             try {
diff --git a/src/main/java/com/plusls/ommc/mixin/feature/betterSneaking/MixinPlayerEntity.java b/src/main/java/com/plusls/ommc/mixin/feature/betterSneaking/MixinPlayerEntity.java
index a3dd763..e0a0a31 100644
--- a/src/main/java/com/plusls/ommc/mixin/feature/betterSneaking/MixinPlayerEntity.java
+++ b/src/main/java/com/plusls/ommc/mixin/feature/betterSneaking/MixinPlayerEntity.java
@@ -1,7 +1,6 @@
 package com.plusls.ommc.mixin.feature.betterSneaking;
 
 import com.plusls.ommc.config.Configs;
-import net.minecraft.client.MinecraftClient;
 import net.minecraft.entity.MovementType;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.util.math.Vec3d;
@@ -12,13 +11,13 @@
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
 
 @Mixin(PlayerEntity.class)
-public class MixinPlayerEntity  {
+public class MixinPlayerEntity {
 
     final private static float MAX_STEP_HEIGHT = 1.25f;
     final private static float DEFAULT_STEP_HEIGHT = 114514;
     private float prevStepHeight = DEFAULT_STEP_HEIGHT;
 
-    @Inject(method = "adjustMovementForSneaking", at=@At(value = "FIELD", target = "Lnet/minecraft/util/math/Vec3d;x:D", opcode = Opcodes.GETFIELD, ordinal = 0))
+    @Inject(method = "adjustMovementForSneaking", at = @At(value = "FIELD", target = "Lnet/minecraft/util/math/Vec3d;x:D", opcode = Opcodes.GETFIELD, ordinal = 0))
     private void setStepHeight(Vec3d movement, MovementType type, CallbackInfoReturnable<Vec3d> cir) {
         if (!Configs.FeatureToggle.BETTER_SNEAKING.getBooleanValue()) {
             return;
@@ -28,7 +27,7 @@ private void setStepHeight(Vec3d movement, MovementType type, CallbackInfoReturn
         playerEntity.stepHeight = MAX_STEP_HEIGHT;
     }
 
-    @Inject(method = "adjustMovementForSneaking", at=@At(value = "INVOKE", target = "Lnet/minecraft/util/math/Vec3d;<init>(DDD)V", ordinal = 0))
+    @Inject(method = "adjustMovementForSneaking", at = @At(value = "INVOKE", target = "Lnet/minecraft/util/math/Vec3d;<init>(DDD)V", ordinal = 0))
     private void restoreStepHeight(Vec3d movement, MovementType type, CallbackInfoReturnable<Vec3d> cir) {
         if (!Configs.FeatureToggle.BETTER_SNEAKING.getBooleanValue() || Math.abs(prevStepHeight - DEFAULT_STEP_HEIGHT) <= 0.001) {
             return;