diff --git a/build.gradle b/build.gradle
index 47aee1a..7fd9462 100644
--- a/build.gradle
+++ b/build.gradle
@@ -16,7 +16,10 @@ plugins {
 group 'org.bdware'
 version 'dev-221113'
 
-sourceCompatibility = JavaVersion.VERSION_1_8
+compileJava {
+    sourceCompatibility = JavaVersion.VERSION_1_8
+    targetCompatibility = JavaVersion.VERSION_1_8
+}
 
 def grpc_java_version = '1.41.0'
 def junit_version = '5.7.0'