diff --git a/functions/slack/package.json b/functions/slack/package.json
index abd4d33887..9432e95def 100644
--- a/functions/slack/package.json
+++ b/functions/slack/package.json
@@ -15,7 +15,7 @@
     "test": "ava -T 20s --verbose test/*.test.js"
   },
   "dependencies": {
-    "googleapis": "36.0.0"
+    "googleapis": "40.0.0"
   },
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^3.0.0",