diff --git a/Cargo.toml b/Cargo.toml
index 8f365c8a..df38eed4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -30,7 +30,7 @@ async-graphql-parser = { path = "parser", version = "=2.9.12" }
 async-stream = "0.3.0"
 async-trait = "0.1.48"
 fnv = "1.0.7"
-futures-util = { version = "0.3.13", default-features = false, features = ["io"] }
+futures-util = { version = "0.3.13", default-features = false, features = ["io", "sink"] }
 indexmap = "1.6.2"
 once_cell = "1.7.2"
 pin-project-lite = "0.2.6"