diff --git a/buildSrc/src/main/groovy/brouter.java-conventions.gradle b/buildSrc/src/main/groovy/brouter.java-conventions.gradle
index 390704a..4609537 100644
--- a/buildSrc/src/main/groovy/brouter.java-conventions.gradle
+++ b/buildSrc/src/main/groovy/brouter.java-conventions.gradle
@@ -15,6 +15,10 @@ dependencies {
     testImplementation 'junit:junit:4.13.2'
 }
 
+compileJava {
+    options.release = 11
+}
+
 pmd {
     consoleOutput = true
     toolVersion = '7.0.0'