gistfile1.diff

diff --git a/explorer/package.json b/explorer/package.json
index f4ab26f7..883c9fd3 100644
--- a/explorer/package.json
+++ b/explorer/package.json
@@ -53,6 +53,7 @@
     "@types/express": "^4.16.1",
     "@types/jest": "^24.0.11",
     "@types/material-ui": "^0.21.6",
+    "@types/mime-types": "^2.1.0",
     "@types/node": "^11.11.3",
     "@types/puppeteer": "^1.12.3",
     "@types/supertest": "^2.0.7",
diff --git a/explorer/yarn.lock b/explorer/yarn.lock
index a4c7ab61..0b5a4889 100644
--- a/explorer/yarn.lock
+++ b/explorer/yarn.lock
@@ -101,6 +101,11 @@
     "@types/react" "*"
     "@types/react-addons-linked-state-mixin" "*"
 
+"@types/mime-types@^2.1.0":
+  version "2.1.0"
+  resolved "https://registry.npmjs.org/@types/mime-types/-/mime-types-2.1.0.tgz#9ca52cda363f699c69466c2a6ccdaad913ea7a73"
+  integrity sha1-nKUs2jY/aZxpRmwqbM2q2RPqenM=
+
 "@types/mime@*":
   version "2.0.1"
   resolved "https://registry.npmjs.org/@types/mime/-/mime-2.0.1.tgz#dc488842312a7f075149312905b5e3c0b054c79d"
diff --git a/integration/common b/integration/common
index 79520d2a..c58a973a 100644
--- a/integration/common
+++ b/integration/common
@@ -141,6 +141,7 @@ launch_explorer() {
   title "Starting explorer..."
 
   pushd explorer >/dev/null
+  yarn install
   yarn build &>$SRCROOT/integration/explorer-yarn.log
   yarn prod &>$SRCROOT/integration/explorer.log &
   waitForResponse $explorer_url