diff --git a/README.md b/README.md
index 79f1b57cb..f3f25f0fb 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,8 @@ Simba is open sourced under Apache License 2.0. Currently, it is developed based
 
 Features
 --------------
-+ Expressive **SQL and DataFrame query interface** fully *compatible with original Spark SQL operators*. (SQL mode is currently not supported in the standalone version.)
++ Expressive **SQL and DataFrame query interface** fully *compatible with original Spark SQL operators*.  
+  ***SQL mode is currently not supported in the standalone version.***
 + Native distributed **indexing** support over RDDs.
 + Efficient **spatial operators**: *high-throughput* & *low-latency*.
     - Box range query: `IN RANGE`
diff --git a/build.sbt b/build.sbt
index 93014c548..fb2f171d1 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,7 +1,7 @@
 // Your sbt build file. Guides on how to write one can be found at
 // http://www.scala-sbt.org/0.13/docs/index.html
 
-scalaVersion := "2.11.8"
+scalaVersion := "2.11.12"
 
 sparkVersion := "2.1.0"
 
diff --git a/docs/paper/simba-demo.pdf b/docs/paper/simba-demo.pdf
new file mode 100644
index 000000000..c2a6c9150
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diff --git a/docs/paper/simba-sigmod.pdf b/docs/paper/simba-sigmod.pdf
new file mode 100644
index 000000000..f5dbeb971
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diff --git a/project/build.properties b/project/build.properties
index be414cd94..9100a3952 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1,2 +1,2 @@
 // This file should only contain the version of sbt to use.
-sbt.version=0.13.8
+sbt.version=0.13.17