diff --git a/java/lc-obscura/build.gradle b/java/lc-obscura/build.gradle
index f0dd9fab86400913a562d1deb45175dedc378081..deaa901bbc5663ada8bd3dbbee539faef6efe98d 100644
--- a/java/lc-obscura/build.gradle
+++ b/java/lc-obscura/build.gradle
@@ -6,6 +6,9 @@ plugins {
 group = 'com.leigh-co'
 version = '2.0-SNAPSHOT'
 
+sourceCompatibility = JavaVersion.VERSION_17
+targetCompatibility = JavaVersion.VERSION_17
+
 
 repositories {
     mavenCentral()
diff --git a/java/lc-ris/build.gradle b/java/lc-ris/build.gradle
index 3d5627a0712e1364a09bd72034adc15d4e88a712..b0a4e15df8c50b1c6aa49767c9b331bed0e69caa 100644
--- a/java/lc-ris/build.gradle
+++ b/java/lc-ris/build.gradle
@@ -18,4 +18,9 @@ dependencies {
 
 test {
     useJUnitPlatform()
+}
+
+java {
+    sourceCompatibility = JavaVersion.VERSION_17
+    targetCompatibility = JavaVersion.VERSION_17
 }
\ No newline at end of file