diff --git a/.gitignore b/.gitignore
index 73ca75d..5ebb051 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,7 +9,9 @@ java_pid*.hprof
 tags
 \.idea/workspace.xml
 tutorial_src/build
-.idea
+.idea/
+*.iml
+*.ipr
 .classpath
 .project
 bson-driver/.classpath
diff --git a/project/build.properties b/project/build.properties
index 5e96e96..817bc38 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version=0.12.4
+sbt.version=0.13.9
diff --git a/project/plugins.sbt b/project/plugins.sbt
index 69acb88..de94048 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -1,4 +1,2 @@
-addSbtPlugin("com.orrsella" % "sbt-stats" % "1.0.1")
-
-addSbtPlugin("com.github.mpeltonen" % "sbt-idea" % "1.5.1")
+addSbtPlugin("com.orrsella" % "sbt-stats" % "1.0.5")
 
diff --git a/project/project.iml b/project/project.iml
deleted file mode 100644
index 4d47b1b..0000000
--- a/project/project.iml
+++ /dev/null
@@ -1,66 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module type="JAVA_MODULE" version="4">
-  <component name="FacetManager">
-    <facet type="scala" name="Scala">
-      <configuration>
-        <option name="compilerLibraryLevel" value="Project" />
-        <option name="compilerLibraryName" value="defScala" />
-      </configuration>
-    </facet>
-  </component>
-  <component name="NewModuleRootManager" inherit-compiler-output="true">
-    <exclude-output />
-    <content url="file://$MODULE_DIR$">
-      <sourceFolder url="file://$MODULE_DIR$/build" isTestSource="false" />
-      <sourceFolder url="file://$MODULE_DIR$/build/src" isTestSource="false" />
-      <excludeFolder url="file://$MODULE_DIR$/boot" />
-      <excludeFolder url="file://$MODULE_DIR$/build/target" />
-      <excludeFolder url="file://$MODULE_DIR$/plugins/lib_managed" />
-      <excludeFolder url="file://$MODULE_DIR$/plugins/src_managed" />
-      <excludeFolder url="file://$MODULE_DIR$/plugins/target" />
-    </content>
-    <orderEntry type="inheritedJdk" />
-    <orderEntry type="sourceFolder" forTests="false" />
-    <orderEntry type="library" name="defScala" level="project" />
-    <orderEntry type="module-library">
-      <library>
-        <CLASSES>
-          <root url="file://$MODULE_DIR$/boot/scala-2.7.7/org.scala-tools.sbt/sbt/0.7.7" />
-        </CLASSES>
-        <JAVADOC />
-        <SOURCES />
-        <jarDirectory url="file://$MODULE_DIR$/boot/scala-2.7.7/org.scala-tools.sbt/sbt/0.7.7" recursive="true" />
-      </library>
-    </orderEntry>
-    <orderEntry type="module-library">
-      <library>
-        <CLASSES>
-          <root url="file://$MODULE_DIR$/plugins/target/scala_2.7.7/plugin-classes" />
-        </CLASSES>
-        <JAVADOC />
-        <SOURCES />
-      </library>
-    </orderEntry>
-    <orderEntry type="module-library">
-      <library>
-        <CLASSES>
-          <root url="file://$MODULE_DIR$/build/lib" />
-        </CLASSES>
-        <JAVADOC />
-        <SOURCES />
-        <jarDirectory url="file://$MODULE_DIR$/build/lib" recursive="false" />
-      </library>
-    </orderEntry>
-    <orderEntry type="module-library">
-      <library>
-        <CLASSES>
-          <root url="file://$MODULE_DIR$/plugins/lib_managed/scala_2.7.7" />
-        </CLASSES>
-        <JAVADOC />
-        <SOURCES />
-        <jarDirectory url="file://$MODULE_DIR$/plugins/lib_managed/scala_2.7.7" recursive="false" />
-      </library>
-    </orderEntry>
-  </component>
-</module>
-