diff --git a/build.gradle b/build.gradle
index b6be64b..3f4ea1c 100644
--- a/build.gradle
+++ b/build.gradle
@@ -26,7 +26,7 @@
 group = 'info.istlab.ServerTester'
 version = '1.0'
 description = 'ServerTester'
-java.sourceCompatibility = JavaVersion.VERSION_17
+java.sourceCompatibility = JavaVersion.VERSION_11
 
 publishing {
     publications {