diff --git a/modules/helma/build.gradle b/modules/helma/build.gradle
index 81f22c50..aedc381b 100644
--- a/modules/helma/build.gradle
+++ b/modules/helma/build.gradle
@@ -2,7 +2,7 @@ dependencies {
 	runtimeOnly 'ch.ethz.ganymed:ganymed-ssh2:build209'
 	runtimeOnly 'net.sourceforge.jexcelapi:jxl:2.5.7'
 	runtimeOnly 'org.apache.lucene:lucene-analyzers:2.2.0'
-	runtimeOnly 'org.apache.lucene:lucene-core:2.2.0'
+	runtimeOnly 'org.apache.lucene:lucene-core:6.6.6'
 }
 
 task deps(type: Copy) {