diff --git a/build.sc b/build.sc
index 8c80da8..33d81b3 100644
--- a/build.sc
+++ b/build.sc
@@ -19,17 +19,21 @@ trait HasXsource211 extends ScalaModule {
 
 trait HasChisel3 extends ScalaModule {
   override def ivyDeps = Agg(
-    ivy"edu.berkeley.cs::chisel3:3.4.0"
- )
+    ivy"edu.berkeley.cs::chisel3:3.4.+"
+  )
+  // These lines are needed to use snapshot version of Chisel.
+  def repositories = super.repositories ++ Seq(
+    MavenRepository("https://oss.sonatype.org/content/repositories/snapshots")
+  )
 }
 
 trait HasChiselTests extends CrossSbtModule  {
   object test extends Tests {
     override def ivyDeps = Agg(
       ivy"org.scalatest::scalatest:3.0.4",
-      ivy"edu.berkeley.cs::chisel-iotesters:1.2+",
       ivy"edu.berkeley.cs::chiseltest:0.3.0"
     )
+    // These lines are needed to use snapshot version of Chisel.
     def repositories = super.repositories ++ Seq(
       MavenRepository("https://oss.sonatype.org/content/repositories/snapshots")
     )