diff --git a/README.md b/README.md
index a9700be..9406709 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ repositories {
 dependencies {
     ...
 
-    implementation 'dev.keiji.mangaview:mangaview:0.8.1-alpha3'
+    implementation 'dev.keiji.mangaview:mangaview:0.8.1-alpha4'
 }
 ```
 
diff --git a/build.gradle b/build.gradle
index 5fc4750..3f540fb 100644
--- a/build.gradle
+++ b/build.gradle
@@ -7,8 +7,8 @@ buildscript {
     ext.kotlin_version = "1.4.0"
     ext.coroutines_version = "1.3.8"
 
-    ext.version_name = '0.8.1-alpha3'
-    ext.version_code = 813
+    ext.version_name = '0.8.1-alpha4'
+    ext.version_code = 814
 
     repositories {
         google()