diff --git a/build.gradle b/build.gradle
index 02931d7f..25da9cc2 100644
--- a/build.gradle
+++ b/build.gradle
@@ -13,7 +13,7 @@ dependencies {
   compile group: 'commons-codec', name: 'commons-codec', version: '1.10'
   compile group: 'commons-fileupload', name: 'commons-fileupload', version: '1.3.2'
   compile group: 'commons-logging', name: 'commons-logging', version: '1.2'
-  compile group: 'commons-net', name: 'commons-net', version: '3.5'
+  compile group: 'commons-net', name: 'commons-net', version: '3.6'
   compile group: 'javax.servlet', name: 'javax.servlet-api', version:'3.1.0'
   compile group: 'org.eclipse.jetty', name: 'jetty-servlet', version: '9.4.3.v20170317'
   compile group: 'org.eclipse.jetty', name: 'jetty-xml', version: '9.4.3.v20170317'
diff --git a/lib/commons-net-3.5.jar b/lib/commons-net-3.6.jar
similarity index 53%
rename from lib/commons-net-3.5.jar
rename to lib/commons-net-3.6.jar
index d50e36ff..4537623e 100644
Binary files a/lib/commons-net-3.5.jar and b/lib/commons-net-3.6.jar differ
diff --git a/src/helma/main/launcher/Main.java b/src/helma/main/launcher/Main.java
index f72137ad..e9805faf 100644
--- a/src/helma/main/launcher/Main.java
+++ b/src/helma/main/launcher/Main.java
@@ -44,7 +44,7 @@ public class Main {
         "commons-fileupload-1.3.2.jar",
         "commons-codec-1-10.jar",
         "commons-io-2.2.jar",
-        "commons-net-3.5.jar",
+        "commons-net-3.6.jar",
         "tagsoup-1.2.1.jar",
         "javax.servlet-api-3.1.0.jar",
         "jetty-http-9.4.3.v20170317.jar",