diff --git a/build.gradle b/build.gradle
index 2936f882a..eacda072f 100644
--- a/build.gradle
+++ b/build.gradle
@@ -18,7 +18,7 @@ group = 'org.springframework.samples'
 version = '3.3.0'
 
 java {
-  sourceCompatibility = JavaVersion.VERSION_21
+  sourceCompatibility = 17
 }
 
 repositories {