diff --git a/Cargo.toml b/Cargo.toml
index 29707d7..3367327 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,7 +22,7 @@ redis = { version = "0.15.1"}
 rand  = { version = "0.7" }
 tokio = { version = "0.2.18", features = ["full"] }
 tokio-util = { version = "0.2.0", features = ["full"] }
-tonic = "0.2"
+tonic = "0.5"
 clap  = { version = "~2.33.0" } # command line argument parse
 epaxos = { path = "components/epaxos" }
 storage = { path = "components/storage" }
diff --git a/components/epaxos/Cargo.toml b/components/epaxos/Cargo.toml
index 435b77e..240eba2 100644
--- a/components/epaxos/Cargo.toml
+++ b/components/epaxos/Cargo.toml
@@ -22,7 +22,7 @@ quick-error = { version = "1.2.2" }
 maplit = { version = "1.0.2" }
 tempfile = { version = "3.1.0" }
 prost = { version = "0.6.1" }
-tonic = "0.2"
+tonic = "0.5"
 tokio = { version = "0.2.18", features = ["full"] }
 derive_more = "0.99.3"
 num = "0.2.1"