diff --git a/doc/appengine/go.mod b/doc/appengine/go.mod
index 398c008b2..5e4b4a72d 100644
--- a/doc/appengine/go.mod
+++ b/doc/appengine/go.mod
@@ -6,5 +6,5 @@ require google.golang.org/appengine/v2 v2.0.5
 
 require (
 	github.com/golang/protobuf v1.5.2 // indirect
-	google.golang.org/protobuf v1.30.0 // indirect
+	google.golang.org/protobuf v1.33.0 // indirect
 )
diff --git a/doc/appengine/go.sum b/doc/appengine/go.sum
index 987d3692b..e1e17e48a 100644
--- a/doc/appengine/go.sum
+++ b/doc/appengine/go.sum
@@ -33,5 +33,6 @@ google.golang.org/appengine/v2 v2.0.5 h1:4C+F3Cd3L2nWEfSmFEZDPjQvDwL8T0YCeZBysZi
 google.golang.org/appengine/v2 v2.0.5/go.mod h1:WoEXGoXNfa0mLvaH5sV3ZSGXwVmy8yf7Z1JKf3J3wLI=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.30.0 h1:kPPoIgf3TsEvrm0PFe15JQ+570QVxYzEvvHqChK+cng=
 google.golang.org/protobuf v1.30.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
+google.golang.org/protobuf v1.33.0 h1:uNO2rsAINq/JlFpSdYEKIZ0uKD/R9cpdv0T+yoGwGmI=
+google.golang.org/protobuf v1.33.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=