diff --git a/Assets/Coffee/UIExtensions/SoftMaskForUGUI/CHANGELOG.md b/Assets/Coffee/UIExtensions/SoftMaskForUGUI/CHANGELOG.md
index 1003f91..86b5c18 100644
--- a/Assets/Coffee/UIExtensions/SoftMaskForUGUI/CHANGELOG.md
+++ b/Assets/Coffee/UIExtensions/SoftMaskForUGUI/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## [v0.8.1](https://github.com/mob-sakai/SoftMaskForUGUI/tree/v0.8.1) (2019-05-07)
+
+[Full Changelog](https://github.com/mob-sakai/SoftMaskForUGUI/compare/v0.8.0...v0.8.1)
+
+**Fixed bugs:**
+
+- Unity 2018.x compile failed [\#51](https://github.com/mob-sakai/SoftMaskForUGUI/issues/51)
+
 ## [v0.8.0](https://github.com/mob-sakai/SoftMaskForUGUI/tree/v0.8.0) (2019-05-01)
 
 [Full Changelog](https://github.com/mob-sakai/SoftMaskForUGUI/compare/v0.7.2...v0.8.0)
diff --git a/Assets/Coffee/UIExtensions/SoftMaskForUGUI/README.md b/Assets/Coffee/UIExtensions/SoftMaskForUGUI/README.md
index fbbaf8b..bdf135c 100644
--- a/Assets/Coffee/UIExtensions/SoftMaskForUGUI/README.md
+++ b/Assets/Coffee/UIExtensions/SoftMaskForUGUI/README.md
@@ -88,7 +88,7 @@ Find the manifest.json file in the Packages folder of your project and edit it t
 ```js
 {
   "dependencies": {
-    "com.coffee.softmask-for-ugui": "https://github.com/mob-sakai/SoftMaskForUGUI.git#0.8.0",
+    "com.coffee.softmask-for-ugui": "https://github.com/mob-sakai/SoftMaskForUGUI.git#0.8.1",
     ...
   },
 }
diff --git a/Assets/Coffee/UIExtensions/SoftMaskForUGUI/Scripts/SoftMask.cs b/Assets/Coffee/UIExtensions/SoftMaskForUGUI/Scripts/SoftMask.cs
index 7a817a8..fecb688 100755
--- a/Assets/Coffee/UIExtensions/SoftMaskForUGUI/Scripts/SoftMask.cs
+++ b/Assets/Coffee/UIExtensions/SoftMaskForUGUI/Scripts/SoftMask.cs
@@ -414,7 +414,7 @@ namespace Coffee.UIExtensions
 					Matrix4x4 nowsVP = cam.projectionMatrix * cam.worldToCameraMatrix;
 
 #if UNITY_2018_1_OR_NEWER
-					Matrix4x4 previousVP = cam.reviousViewProjectionMatrix;
+					Matrix4x4 previousVP = cam.previousViewProjectionMatrix;
 #else
 					Matrix4x4 previousVP = default(Matrix4x4);
 					int id = cam.GetInstanceID ();
diff --git a/Assets/Coffee/UIExtensions/SoftMaskForUGUI/package.json b/Assets/Coffee/UIExtensions/SoftMaskForUGUI/package.json
index 451eaf9..70ede13 100644
--- a/Assets/Coffee/UIExtensions/SoftMaskForUGUI/package.json
+++ b/Assets/Coffee/UIExtensions/SoftMaskForUGUI/package.json
@@ -2,7 +2,7 @@
 	"name": "com.coffee.softmask-for-ugui",
 	"displayName": "Soft Mask For uGUI",
 	"description": "SoftMask is a smooth masking component for uGUI elements in Unity.\nBy using SoftMask instead of default Mask, rounded edges of UI elements can be expressed beautifully.",
-	"version": "0.8.0",
+	"version": "0.8.1",
 	"unity": "2017.1",
 	"license": "MIT",
 	"repository": {
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1003f91..86b5c18 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## [v0.8.1](https://github.com/mob-sakai/SoftMaskForUGUI/tree/v0.8.1) (2019-05-07)
+
+[Full Changelog](https://github.com/mob-sakai/SoftMaskForUGUI/compare/v0.8.0...v0.8.1)
+
+**Fixed bugs:**
+
+- Unity 2018.x compile failed [\#51](https://github.com/mob-sakai/SoftMaskForUGUI/issues/51)
+
 ## [v0.8.0](https://github.com/mob-sakai/SoftMaskForUGUI/tree/v0.8.0) (2019-05-01)
 
 [Full Changelog](https://github.com/mob-sakai/SoftMaskForUGUI/compare/v0.7.2...v0.8.0)
diff --git a/README.md b/README.md
index fbbaf8b..bdf135c 100644
--- a/README.md
+++ b/README.md
@@ -88,7 +88,7 @@ Find the manifest.json file in the Packages folder of your project and edit it t
 ```js
 {
   "dependencies": {
-    "com.coffee.softmask-for-ugui": "https://github.com/mob-sakai/SoftMaskForUGUI.git#0.8.0",
+    "com.coffee.softmask-for-ugui": "https://github.com/mob-sakai/SoftMaskForUGUI.git#0.8.1",
     ...
   },
 }
diff --git a/package.json b/package.json
index 451eaf9..70ede13 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
 	"name": "com.coffee.softmask-for-ugui",
 	"displayName": "Soft Mask For uGUI",
 	"description": "SoftMask is a smooth masking component for uGUI elements in Unity.\nBy using SoftMask instead of default Mask, rounded edges of UI elements can be expressed beautifully.",
-	"version": "0.8.0",
+	"version": "0.8.1",
 	"unity": "2017.1",
 	"license": "MIT",
 	"repository": {