diff --git a/bboxdb-server/pom.xml b/bboxdb-server/pom.xml
index cb63062d4..50052bdf1 100644
--- a/bboxdb-server/pom.xml
+++ b/bboxdb-server/pom.xml
@@ -58,7 +58,7 @@
 		<dependency>
 			<groupId>org.apache.zookeeper</groupId>
 			<artifactId>zookeeper</artifactId>
-			<version>3.9.0</version>
+			<version>3.9.1</version>
 			<exclusions>
 				<exclusion>
 					<groupId>org.slf4j</groupId>