diff --git a/executor-monitor/src/main/java/com/linkedpipes/etl/executor/monitor/web/WebServer.java b/executor-monitor/src/main/java/com/linkedpipes/etl/executor/monitor/web/WebServer.java
index f934a9962..fb046a780 100644
--- a/executor-monitor/src/main/java/com/linkedpipes/etl/executor/monitor/web/WebServer.java
+++ b/executor-monitor/src/main/java/com/linkedpipes/etl/executor/monitor/web/WebServer.java
@@ -101,7 +101,7 @@ private void buildServer() throws IOException {
     }
 
     private static QueuedThreadPool createThreadPool() {
-        final QueuedThreadPool threadPool = new QueuedThreadPool(3, 1);
+        final QueuedThreadPool threadPool = new QueuedThreadPool(4, 1);
         threadPool.setName("web-server");
         return threadPool;
     }
diff --git a/executor/src/main/java/com/linkedpipes/etl/executor/web/WebServer.java b/executor/src/main/java/com/linkedpipes/etl/executor/web/WebServer.java
index 7f481d8c2..9a6e933aa 100644
--- a/executor/src/main/java/com/linkedpipes/etl/executor/web/WebServer.java
+++ b/executor/src/main/java/com/linkedpipes/etl/executor/web/WebServer.java
@@ -108,7 +108,7 @@ private void buildServer() throws IOException {
     }
 
     private static QueuedThreadPool createThreadPool() {
-        final QueuedThreadPool threadPool = new QueuedThreadPool(3, 1);
+        final QueuedThreadPool threadPool = new QueuedThreadPool(4, 1);
         threadPool.setName("web-server");
         return threadPool;
     }
diff --git a/pom-parent/pom.xml b/pom-parent/pom.xml
index b711e941d..ec1900a46 100644
--- a/pom-parent/pom.xml
+++ b/pom-parent/pom.xml
@@ -20,7 +20,7 @@
         <jackson.version>2.7.2</jackson.version>
         <springframework.version>4.3.4.RELEASE</springframework.version>
         <rdf4j.version>2.2.1</rdf4j.version>
-        <jetty.version>9.3.14.v20161028</jetty.version>
+        <jetty.version>9.4.11.v20180605</jetty.version>
         <lp.version>0.0.0</lp.version>
     </properties>
 
diff --git a/storage/src/main/java/com/linkedpipes/etl/storage/web/WebServer.java b/storage/src/main/java/com/linkedpipes/etl/storage/web/WebServer.java
index 5ab71aecd..410b74422 100644
--- a/storage/src/main/java/com/linkedpipes/etl/storage/web/WebServer.java
+++ b/storage/src/main/java/com/linkedpipes/etl/storage/web/WebServer.java
@@ -99,7 +99,7 @@ private void buildServer() throws IOException {
     }
 
     private static QueuedThreadPool createThreadPool() {
-        final QueuedThreadPool threadPool = new QueuedThreadPool(3, 1);
+        final QueuedThreadPool threadPool = new QueuedThreadPool(4, 1);
         threadPool.setName("web-server");
         return threadPool;
     }