diff --git a/languages/rust/Cargo.toml b/languages/rust/Cargo.toml
index ce5060f..f33cf06 100644
--- a/languages/rust/Cargo.toml
+++ b/languages/rust/Cargo.toml
@@ -37,4 +37,4 @@ tokio = { version = "0.3.0", features = ["full"] }
 tokio-compat-02 = "0.2.0"
 
 [build-dependencies]
-tonic-build = "0.3.1"
+tonic-build = "0.4.0"