diff --git a/java/case2geo/pom.xml b/java/case2geo/pom.xml
index 2566dda..7ff18f9 100644
--- a/java/case2geo/pom.xml
+++ b/java/case2geo/pom.xml
@@ -42,7 +42,7 @@
     <dependency>
       <groupId>ch.qos.logback</groupId>
       <artifactId>logback-classic</artifactId>
-      <version>1.5.18</version>
+      <version>1.5.20</version>
     </dependency>
     <dependency>
       <groupId>com.github.jsonld-java</groupId>