diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5ccd212..55affbc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+# [3.0.0-preview.34](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v3.0.0-preview.33...v3.0.0-preview.34) (2020-09-15)
+
+
+### Bug Fixes
+
+* not working as expected in world simulation space ([683fcb4](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/683fcb4ecdf8bfa0994571f5d6c3dd2bc242ca2a)), closes [#98](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/98)
+
 # [3.0.0-preview.33](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v3.0.0-preview.32...v3.0.0-preview.33) (2020-09-14)
 
 
diff --git a/Scripts/UIParticleUpdater.cs b/Scripts/UIParticleUpdater.cs
index ba05cc6..1bbb34c 100755
--- a/Scripts/UIParticleUpdater.cs
+++ b/Scripts/UIParticleUpdater.cs
@@ -136,13 +136,14 @@ namespace Coffee.UIExtensions
             var root = particle.transform;
             var rootMatrix = Matrix4x4.Rotate(root.rotation).inverse
                              * Matrix4x4.Scale(root.lossyScale).inverse;
-            var scaleMatrix = particle.ignoreCanvasScaler
-                ? Matrix4x4.Scale(particle.canvas.rootCanvas.transform.localScale.x * particle.scale * Vector3.one)
-                : Matrix4x4.Scale(particle.scale * Vector3.one);
+            var scale = particle.ignoreCanvasScaler
+                ? particle.canvas.rootCanvas.transform.localScale.x * particle.scale
+                : particle.scale;
+            var scaleMatrix = Matrix4x4.Scale(scale * Vector3.one);
 
             // Cache position
             var position = particle.transform.position;
-            var diff = (position - particle.cachedPosition) * (1 - 1 / particle.scale);
+            var diff = (position - particle.cachedPosition) * (1 - 1 / scale);
             particle.cachedPosition = position;
 
             for (var i = 0; i < particle.particles.Count; i++)
diff --git a/package.json b/package.json
index 13c29ce..ca0cd42 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "com.coffee.ui-particle",
   "displayName": "UI Particle",
   "description": "This plugin provide a component to render particle effect for uGUI.\nThe particle rendering is maskable and sortable, without Camera, RenderTexture or Canvas.",
-  "version": "3.0.0-preview.33",
+  "version": "3.0.0-preview.34",
   "unity": "2018.2",
   "license": "MIT",
   "repository": {