diff --git a/BauSystem_19/build.gradle b/BauSystem_19/build.gradle
index b1c37d01..7973f1b0 100644
--- a/BauSystem_19/build.gradle
+++ b/BauSystem_19/build.gradle
@@ -27,8 +27,8 @@ version '1.0'
 
 compileJava.options.encoding = 'UTF-8'
 
-sourceCompatibility = 11
-targetCompatibility = 11
+sourceCompatibility = 17
+targetCompatibility = 17
 
 sourceSets {
     main {
diff --git a/BauSystem_20/build.gradle b/BauSystem_20/build.gradle
index be167e64..17121b8d 100644
--- a/BauSystem_20/build.gradle
+++ b/BauSystem_20/build.gradle
@@ -27,8 +27,8 @@ version '1.0'
 
 compileJava.options.encoding = 'UTF-8'
 
-sourceCompatibility = 11
-targetCompatibility = 11
+sourceCompatibility = 17
+targetCompatibility = 17
 
 sourceSets {
     main {