diff --git a/build.gradle b/build.gradle
index 7bd3518..5ede451 100644
--- a/build.gradle
+++ b/build.gradle
@@ -10,8 +10,8 @@ group 'org.hyperskill'
 version '12.0.2'
 
 java {
-    sourceCompatibility = JavaVersion.VERSION_21
-    targetCompatibility = JavaVersion.VERSION_21
+    sourceCompatibility = JavaVersion.VERSION_17
+    targetCompatibility = JavaVersion.VERSION_17
 }
 
 repositories {