diff --git a/build.sbt b/build.sbt
index de80fba..9cf2965 100755
--- a/build.sbt
+++ b/build.sbt
@@ -15,7 +15,7 @@ developers += Developer(
 
 addSbtJsEngine("1.3.5")
 
-libraryDependencies += "org.webjars" % "mocha" % "1.17.1"
+libraryDependencies += "org.webjars" % "mocha" % "3.2.0"
 
 // Customise sbt-dynver's behaviour to make it work with tags which aren't v-prefixed
 ThisBuild / dynverVTagPrefix := false