diff --git a/build.gradle b/build.gradle
index 3897a78..c118e30 100644
--- a/build.gradle
+++ b/build.gradle
@@ -15,7 +15,7 @@ buildscript {
     }
 
     dependencies {
-        classpath "org.gretty:gretty:3.0.6"
+        classpath "org.gretty:gretty:4.0.0"
     }
 }