diff --git a/Assets/VRM10/Runtime/FastSpringBone/FastSpringBone10.asmdef b/Assets/VRM10/Runtime/FastSpringBone/FastSpringBone10.asmdef
index d36c9bedd7..70ab6d3056 100644
--- a/Assets/VRM10/Runtime/FastSpringBone/FastSpringBone10.asmdef
+++ b/Assets/VRM10/Runtime/FastSpringBone/FastSpringBone10.asmdef
@@ -1,8 +1,7 @@
 {
     "name": "FastSpringBone10",
     "references": [
-        "GUID:2665a8d13d1b3f18800f46e256720795",
-        "GUID:d8b63aba1907145bea998dd612889d6b"
+        "GUID:2665a8d13d1b3f18800f46e256720795"
     ],
     "includePlatforms": [],
     "excludePlatforms": [],
diff --git a/Assets/VRM10/Runtime/FastSpringBone/System/UpdateFastSpringBoneJob.cs b/Assets/VRM10/Runtime/FastSpringBone/System/UpdateFastSpringBoneJob.cs
index ef63511c70..6c2315861d 100644
--- a/Assets/VRM10/Runtime/FastSpringBone/System/UpdateFastSpringBoneJob.cs
+++ b/Assets/VRM10/Runtime/FastSpringBone/System/UpdateFastSpringBoneJob.cs
@@ -1,7 +1,6 @@
 using System;
 using Unity.Collections;
 using Unity.Jobs;
-using Unity.Mathematics;
 using UnityEngine;
 using UniVRM10.FastSpringBones.Blittables;
 #if ENABLE_SPRINGBONE_BURST
@@ -79,8 +78,7 @@ public void Execute(int index)
                     var collider = Colliders[colliderIndex];
                     var colliderTransform = Transforms[collider.transformIndex + transformIndexOffset];
                     var colliderScale = colliderTransform.localToWorldMatrix.lossyScale;
-                    var absColliderScale = math.abs(colliderScale);
-                    var maxColliderScale = math.max(math.max(absColliderScale.x, absColliderScale.y), absColliderScale.z);
+                    var maxColliderScale = Mathf.Max(Mathf.Max(Mathf.Abs(colliderScale.x), Mathf.Abs(colliderScale.y)), Mathf.Abs(colliderScale.z));
                     var worldPosition = colliderTransform.localToWorldMatrix.MultiplyPoint3x4(collider.offset);
                     var worldTail = colliderTransform.localToWorldMatrix.MultiplyPoint3x4(collider.tail);
                     
@@ -148,7 +146,7 @@ private static Quaternion Normalize(Quaternion q)
             var num = (float)Math.Sqrt(Quaternion.Dot(q, q));
             return num < float.Epsilon ? Quaternion.identity : new Quaternion(q.x / num, q.y / num, q.z / num, q.w / num);
         }
-        
+
         private static void ResolveCapsuleCollision(
             Vector3 worldTail,
             Vector3 worldPosition,