diff --git a/pom.xml b/pom.xml
index cadb102..3c55f3f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -190,7 +190,7 @@
     <!-- dependency versions -->
     <version.apache.httpclient>4.5.1</version.apache.httpclient>
     <version.apache.httpcore>4.4.4</version.apache.httpcore>
-    <version.ch.qos.logback>1.2.2</version.ch.qos.logback>
+    <version.ch.qos.logback>1.2.9</version.ch.qos.logback>
     <version.com.fazecast>1.3.11</version.com.fazecast>
     <version.com.google.guava>21.0</version.com.google.guava>
     <version.com.h2database>1.4.194</version.com.h2database>