diff --git a/package.json b/package.json
index 07971b0..9e2d17b 100644
--- a/package.json
+++ b/package.json
@@ -38,6 +38,7 @@
     "eslint-plugin-babel": "^4.1.2",
     "follow-redirects": "^1.9.0",
     "matrix-js-sdk": "^2.4.6-rc.1",
+    "rimraf": "^3.0.0",
     "tar": "^5.0.5"
   },
   "build": {
diff --git a/yarn.lock b/yarn.lock
index 5175ddf..966da90 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2278,6 +2278,13 @@ rimraf@^2.5.2:
   dependencies:
     glob "^7.1.3"
 
+rimraf@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-3.0.0.tgz#614176d4b3010b75e5c390eb0ee96f6dc0cebb9b"
+  integrity sha512-NDGVxTsjqfunkds7CqsOiEnxln4Bo7Nddl3XhS4pXg5OzwkLqJ971ZVAAnB+DDLnF76N+VnDEiBHaVV8I06SUg==
+  dependencies:
+    glob "^7.1.3"
+
 run-async@^2.2.0:
   version "2.3.0"
   resolved "https://registry.yarnpkg.com/run-async/-/run-async-2.3.0.tgz#0371ab4ae0bdd720d4166d7dfda64ff7a445a6c0"