diff --git a/functions/billing/requirements.txt b/functions/billing/requirements.txt
index aa381f58701..03631279d48 100644
--- a/functions/billing/requirements.txt
+++ b/functions/billing/requirements.txt
@@ -1,4 +1,4 @@
-slackclient==2.6.1
+slackclient==2.6.2
 # [START functions_billing_limit_appengine_deps]
 google-api-python-client==1.8.4
 # [START functions_billing_limit_appengine_deps]