diff --git a/app.json b/app.json
index 7e29b62..47d1aaf 100644
--- a/app.json
+++ b/app.json
@@ -9,6 +9,9 @@
     "STAGING_DATABASE_URL": {
       "required": true
     },
+    "GOOGLE_APPLICATION_CREDENTIALS": {
+      "required": true
+    },
     "LANG": {
       "required": true
     },