Set Spark version to 2.2.3 preparing for release
diff --git a/pom.xml b/pom.xml
index 590a103..019f245 100644
--- a/pom.xml
+++ b/pom.xml
@@ -99,7 +99,7 @@
     <log4j.version>1.2.17</log4j.version>
 
     <!-- Spark version -->
-    <spark.version>2.2.2</spark.version>
+    <spark.version>2.2.3</spark.version>
 
     <!-- MQTT Client -->
     <mqtt.paho.client>1.1.0</mqtt.paho.client>