diff --git a/clients/webassembly/Cargo.toml b/clients/webassembly/Cargo.toml
index 9f729a660b..d887b2df56 100644
--- a/clients/webassembly/Cargo.toml
+++ b/clients/webassembly/Cargo.toml
@@ -19,6 +19,7 @@ coconut = ["coconut-interface", "credentials", "gateway-client/coconut"]
 
 [dependencies]
 futures = "0.3"
+tokio = { version = "1.21.2", features = ["macros"] }
 serde = { version = "1.0", features = ["derive"] }
 serde-wasm-bindgen = "0.4"
 wasm-bindgen = { version = "=0.2.83", features = ["serde-serialize"]  }