diff --git a/.pullapprove.yml b/.pullapprove.yml
new file mode 100644
index 0000000..7eee40d
--- /dev/null
+++ b/.pullapprove.yml
@@ -0,0 +1,13 @@
+approve_by_comment: true
+approve_regex: ':\+1:'
+reset_on_push: false
+author_approval: ignored
+reviewers:
+    required: 2
+    members:
+        - cjllanwarne
+        - Horneth
+        - scottfrazer
+        - mcovarr
+        - geoffjentry
+        - kshakir
diff --git a/build.sbt b/build.sbt
index bb6b2cd..8edff10 100644
--- a/build.sbt
+++ b/build.sbt
@@ -10,7 +10,7 @@ organization := "org.broadinstitute"
 scalaVersion := "2.11.7"
 
 // Upcoming release, or current if we're on the master branch
-git.baseVersion := "0.3"
+git.baseVersion := "0.4"
 
 // Shorten the git commit hash
 git.gitHeadCommit := git.gitHeadCommit.value map { _.take(7) }
@@ -30,7 +30,7 @@ resolvers ++= Seq(
 )
 
 libraryDependencies ++= Seq(
-  "org.broadinstitute" %% "wdl4s" % "0.3",
+  "org.broadinstitute" %% "wdl4s" % "0.4",
   //---------- Test libraries -------------------//
   "org.scalatest" %% "scalatest" % "2.2.5" % Test
 )