diff --git a/.gitignore b/.gitignore
index dc09fb4..a9701de 100644
--- a/.gitignore
+++ b/.gitignore
@@ -38,3 +38,4 @@ bin/
 
 simWorkspace/
 tmp/
+null
diff --git a/project/build.properties b/project/build.properties
index 72f9028..6adcdc7 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.2.7
+sbt.version=1.3.3