diff --git a/build.gradle b/build.gradle
index 0071fe6..d09a342 100644
--- a/build.gradle
+++ b/build.gradle
@@ -2,7 +2,7 @@ import org.apache.tools.ant.filters.ReplaceTokens
 
 plugins {
     id 'java'
-    id 'com.github.johnrengelman.shadow' version '7.1.2'
+    id 'com.github.johnrengelman.shadow' version '8.1.1'
 }
 
 group = 'page.nafuchoco'