diff --git a/tools/contributed/lisum/pom.xml b/tools/contributed/lisum/pom.xml
index f0df7997e32..e494bb15c8d 100644
--- a/tools/contributed/lisum/pom.xml
+++ b/tools/contributed/lisum/pom.xml
@@ -157,7 +157,7 @@
         <dependency>
             <groupId>org.apache.httpcomponents</groupId>
             <artifactId>httpclient</artifactId>
-            <version>4.3.1</version>
+            <version>4.3.6</version>
             <type>jar</type>
         </dependency>        
         <dependency>