diff --git a/common.gradle b/common.gradle
index b26910e..b6479c0 100644
--- a/common.gradle
+++ b/common.gradle
@@ -115,6 +115,8 @@ java {
 	// if it is present.
 	// If you remove this line, sources will not be generated.
 	withSourcesJar()
+	sourceCompatibility = JAVA_VERSION
+	targetCompatibility = JAVA_VERSION
 }
 
 jar {