diff --git a/Cargo.toml b/Cargo.toml
index 307267ac..29b56186 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,7 +23,7 @@ futures-executor = "0.3"
 futures-util = { version = "0.3", default-features = false, features = ["std", "sink"] }
 protobuf = { version = "2.0", optional = true }
 protobufv3 = { package = "protobuf", version = "3.2", optional = true }
-prost = { version = "0.12", optional = true }
+prost = { version = "0.13", optional = true }
 bytes = { version = "1.0", optional = true }
 log = "0.4"
 parking_lot = "0.12"
diff --git a/compiler/Cargo.toml b/compiler/Cargo.toml
index 73055c9f..ccc7b7db 100644
--- a/compiler/Cargo.toml
+++ b/compiler/Cargo.toml
@@ -18,9 +18,9 @@ prost-codec = ["prost-build", "prost-types", "prost", "derive-new", "tempfile"]
 
 [dependencies]
 protobuf = { version = "2", optional = true }
-prost = { version = "0.12", optional = true }
-prost-build = { version = "0.12", optional = true }
-prost-types = { version = "0.12", optional = true }
+prost = { version = "0.13", optional = true }
+prost-build = { version = "0.13", optional = true }
+prost-types = { version = "0.13", optional = true }
 derive-new = { version = "0.6", optional = true }
 tempfile = { version = "3.0", optional = true }
 
diff --git a/health/Cargo.toml b/health/Cargo.toml
index f26bccfc..8bad58d7 100644
--- a/health/Cargo.toml
+++ b/health/Cargo.toml
@@ -22,7 +22,7 @@ prost-codec = ["grpcio/prost-codec", "prost"]
 futures-executor = "0.3"
 futures-util = { version = "0.3", default-features = false, features = ["std"] }
 grpcio = { path = "..", version = "0.13.0", default-features = false }
-prost = { version = "0.12", optional = true }
+prost = { version = "0.13", optional = true }
 protobuf = { version = "2", optional = true }
 protobufv3 = { package = "protobuf", version = "3.2", optional = true }
 log = "0.4"
diff --git a/health/src/proto/prost/grpc.health.v1.rs b/health/src/proto/prost/grpc.health.v1.rs
index 222daa76..7853ef43 100644
--- a/health/src/proto/prost/grpc.health.v1.rs
+++ b/health/src/proto/prost/grpc.health.v1.rs
@@ -6,7 +6,7 @@ pub struct HealthCheckRequest {
     pub service: ::prost::alloc::string::String,
 }
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct HealthCheckResponse {
     #[prost(enumeration = "health_check_response::ServingStatus", tag = "1")]
     pub status: i32,
diff --git a/health/src/proto/protobuf_v3/health.rs b/health/src/proto/protobuf_v3/health.rs
index 8282afdf..dd97cf29 100644
--- a/health/src/proto/protobuf_v3/health.rs
+++ b/health/src/proto/protobuf_v3/health.rs
@@ -1,4 +1,4 @@
-// This file is generated by rust-protobuf 3.4.0. Do not edit
+// This file is generated by rust-protobuf 3.5.0. Do not edit
 // @generated
 
 // https://github.com/rust-lang/rust-clippy/issues/702
@@ -22,7 +22,7 @@
 
 /// Generated files are compatible only with the same version
 /// of protobuf runtime.
-const _PROTOBUF_VERSION_CHECK: () = ::protobufv3::VERSION_3_4_0;
+const _PROTOBUF_VERSION_CHECK: () = ::protobufv3::VERSION_3_5_0;
 
 // @@protoc_insertion_point(message:grpc.health.v1.HealthCheckRequest)
 #[derive(PartialEq,Clone,Default,Debug)]
diff --git a/proto/Cargo.toml b/proto/Cargo.toml
index 57655323..89b6ec4f 100644
--- a/proto/Cargo.toml
+++ b/proto/Cargo.toml
@@ -20,13 +20,13 @@ prost-codec = ["prost-build", "prost-derive", "prost-types", "bytes", "lazy_stat
 [dependencies]
 grpcio = { path = "..", features = ["boringssl"], version = "0.13.0", default-features = false }
 bytes = { version = "1.0", optional = true }
-prost = { version = "0.12", optional = true }
-prost-derive = { version = "0.12", optional = true }
-prost-types = { version = "0.12", optional = true }
+prost = { version = "0.13", optional = true }
+prost-derive = { version = "0.13", optional = true }
+prost-types = { version = "0.13", optional = true }
 protobuf = { version = "2", optional = true }
 protobufv3 = { package = "protobuf", version = "3.2", optional = true }
 lazy_static = { version = "1.3", optional = true }
 
 [build-dependencies]
-prost-build = { version = "0.12", optional = true }
+prost-build = { version = "0.13", optional = true }
 walkdir = "2.2"
diff --git a/proto/src/proto/prost/example/routeguide.rs b/proto/src/proto/prost/example/routeguide.rs
index 87cf1821..5aa205b3 100644
--- a/proto/src/proto/prost/example/routeguide.rs
+++ b/proto/src/proto/prost/example/routeguide.rs
@@ -4,7 +4,7 @@
 /// Latitudes should be in the range +/- 90 degrees and longitude should be in
 /// the range +/- 180 degrees (inclusive).
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct Point {
     #[prost(int32, tag = "1")]
     pub latitude: i32,
@@ -14,7 +14,7 @@ pub struct Point {
 /// A latitude-longitude rectangle, represented as two diagonally opposite
 /// points "lo" and "hi".
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct Rectangle {
     /// One corner of the rectangle.
     #[prost(message, optional, tag = "1")]
@@ -53,7 +53,7 @@ pub struct RouteNote {
 /// detected features, and the total distance covered as the cumulative sum of
 /// the distance between each point.
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct RouteSummary {
     /// The number of points received.
     #[prost(int32, tag = "1")]
diff --git a/proto/src/proto/prost/testing/grpc.testing.rs b/proto/src/proto/prost/testing/grpc.testing.rs
index 592f90f4..8c3d7a93 100644
--- a/proto/src/proto/prost/testing/grpc.testing.rs
+++ b/proto/src/proto/prost/testing/grpc.testing.rs
@@ -1,6 +1,6 @@
 // This file is @generated by prost-build.
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct ByteBufferParams {
     #[prost(int32, tag = "1")]
     pub req_size: i32,
@@ -8,7 +8,7 @@ pub struct ByteBufferParams {
     pub resp_size: i32,
 }
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct SimpleProtoParams {
     #[prost(int32, tag = "1")]
     pub req_size: i32,
@@ -18,10 +18,10 @@ pub struct SimpleProtoParams {
 /// TODO (vpai): Fill this in once the details of complex, representative
 ///               protos are decided
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct ComplexProtoParams {}
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct PayloadConfig {
     #[prost(oneof = "payload_config::Payload", tags = "1, 2, 3")]
     pub payload: ::core::option::Option<payload_config::Payload>,
@@ -29,7 +29,7 @@ pub struct PayloadConfig {
 /// Nested message and enum types in `PayloadConfig`.
 pub mod payload_config {
     #[allow(clippy::derive_partial_eq_without_eq)]
-    #[derive(Clone, PartialEq, ::prost::Oneof)]
+    #[derive(Clone, Copy, PartialEq, ::prost::Oneof)]
     pub enum Payload {
         #[prost(message, tag = "1")]
         BytebufParams(super::ByteBufferParams),
@@ -40,7 +40,7 @@ pub mod payload_config {
     }
 }
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct ServerStats {
     /// wall clock time change in seconds since last reset
     #[prost(double, tag = "1")]
@@ -64,7 +64,7 @@ pub struct ServerStats {
 }
 /// Histogram params based on grpc/support/histogram.c
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct HistogramParams {
     /// first bucket is [0, 1 + resolution)
     #[prost(double, tag = "1")]
@@ -91,7 +91,7 @@ pub struct HistogramData {
     pub count: f64,
 }
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct RequestResultCount {
     #[prost(int32, tag = "1")]
     pub status_code: i32,
@@ -121,7 +121,7 @@ pub struct ClientStats {
 /// Parameters of poisson process distribution, which is a good representation
 /// of activity coming in from independent identical stationary sources.
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct PoissonParams {
     /// The rate of arrivals (a.k.a. lambda parameter of the exp distribution).
     #[prost(double, tag = "1")]
@@ -130,10 +130,10 @@ pub struct PoissonParams {
 /// Once an RPC finishes, immediately start a new one.
 /// No configuration parameters needed.
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct ClosedLoopParams {}
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct LoadParams {
     #[prost(oneof = "load_params::Load", tags = "1, 2")]
     pub load: ::core::option::Option<load_params::Load>,
@@ -141,7 +141,7 @@ pub struct LoadParams {
 /// Nested message and enum types in `LoadParams`.
 pub mod load_params {
     #[allow(clippy::derive_partial_eq_without_eq)]
-    #[derive(Clone, PartialEq, ::prost::Oneof)]
+    #[derive(Clone, Copy, PartialEq, ::prost::Oneof)]
     pub enum Load {
         #[prost(message, tag = "1")]
         ClosedLoop(super::ClosedLoopParams),
@@ -234,7 +234,7 @@ pub struct ClientStatus {
 }
 /// Request current stats
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct Mark {
     /// if true, the stats will be reset after taking their snapshot.
     #[prost(bool, tag = "1")]
@@ -312,7 +312,7 @@ pub mod server_args {
     }
 }
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct ServerStatus {
     #[prost(message, optional, tag = "1")]
     pub stats: ::core::option::Option<ServerStats>,
@@ -324,17 +324,17 @@ pub struct ServerStatus {
     pub cores: i32,
 }
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct CoreRequest {}
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct CoreResponse {
     /// Number of cores available on the server
     #[prost(int32, tag = "1")]
     pub cores: i32,
 }
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct Void {}
 /// A single performance scenario: input to qps_json_driver
 #[allow(clippy::derive_partial_eq_without_eq)]
@@ -375,7 +375,7 @@ pub struct Scenarios {
 /// Basic summary that can be computed from ClientStats and ServerStats
 /// once the scenario has finished.
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct ScenarioResultSummary {
     /// Total number of operations per second over all clients.
     #[prost(double, tag = "1")]
@@ -565,13 +565,13 @@ impl RpcType {
 ///    };
 ///
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct Empty {}
 /// TODO(dgq): Go back to using well-known types once
 /// <https://github.com/grpc/grpc/issues/6980> has been fixed.
 /// import "google/protobuf/wrappers.proto";
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct BoolValue {
     /// The bool value.
     #[prost(bool, tag = "1")]
@@ -664,7 +664,7 @@ pub struct StreamingInputCallRequest {
 }
 /// Client-streaming response.
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct StreamingInputCallResponse {
     /// Aggregated size of payloads received from the client.
     #[prost(int32, tag = "1")]
@@ -672,7 +672,7 @@ pub struct StreamingInputCallResponse {
 }
 /// Configuration for a particular response.
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct ResponseParameters {
     /// Desired payload sizes in responses from the server.
     #[prost(int32, tag = "1")]
@@ -720,7 +720,7 @@ pub struct StreamingOutputCallResponse {
 /// For reconnect interop test only.
 /// Client tells server what reconnection parameters it used.
 #[allow(clippy::derive_partial_eq_without_eq)]
-#[derive(Clone, PartialEq, ::prost::Message)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
 pub struct ReconnectParams {
     #[prost(int32, tag = "1")]
     pub max_reconnect_backoff_ms: i32,
diff --git a/proto/src/proto/protobuf_v3/example/helloworld.rs b/proto/src/proto/protobuf_v3/example/helloworld.rs
index 9665850f..2b195267 100644
--- a/proto/src/proto/protobuf_v3/example/helloworld.rs
+++ b/proto/src/proto/protobuf_v3/example/helloworld.rs
@@ -1,4 +1,4 @@
-// This file is generated by rust-protobuf 3.4.0. Do not edit
+// This file is generated by rust-protobuf 3.5.0. Do not edit
 // @generated
 
 // https://github.com/rust-lang/rust-clippy/issues/702
@@ -22,7 +22,7 @@
 
 /// Generated files are compatible only with the same version
 /// of protobuf runtime.
-const _PROTOBUF_VERSION_CHECK: () = ::protobufv3::VERSION_3_4_0;
+const _PROTOBUF_VERSION_CHECK: () = ::protobufv3::VERSION_3_5_0;
 
 // @@protoc_insertion_point(message:helloworld.HelloRequest)
 #[derive(PartialEq,Clone,Default,Debug)]
diff --git a/proto/src/proto/protobuf_v3/example/route_guide.rs b/proto/src/proto/protobuf_v3/example/route_guide.rs
index 6404cb54..e761e49d 100644
--- a/proto/src/proto/protobuf_v3/example/route_guide.rs
+++ b/proto/src/proto/protobuf_v3/example/route_guide.rs
@@ -1,4 +1,4 @@
-// This file is generated by rust-protobuf 3.4.0. Do not edit
+// This file is generated by rust-protobuf 3.5.0. Do not edit
 // @generated
 
 // https://github.com/rust-lang/rust-clippy/issues/702
@@ -22,7 +22,7 @@
 
 /// Generated files are compatible only with the same version
 /// of protobuf runtime.
-const _PROTOBUF_VERSION_CHECK: () = ::protobufv3::VERSION_3_4_0;
+const _PROTOBUF_VERSION_CHECK: () = ::protobufv3::VERSION_3_5_0;
 
 // @@protoc_insertion_point(message:routeguide.Point)
 #[derive(PartialEq,Clone,Default,Debug)]
diff --git a/proto/src/proto/protobuf_v3/google/rpc/status.rs b/proto/src/proto/protobuf_v3/google/rpc/status.rs
index 410fde5b..a12a4b66 100644
--- a/proto/src/proto/protobuf_v3/google/rpc/status.rs
+++ b/proto/src/proto/protobuf_v3/google/rpc/status.rs
@@ -1,4 +1,4 @@
-// This file is generated by rust-protobuf 3.4.0. Do not edit
+// This file is generated by rust-protobuf 3.5.0. Do not edit
 // @generated
 
 // https://github.com/rust-lang/rust-clippy/issues/702
@@ -22,7 +22,7 @@
 
 /// Generated files are compatible only with the same version
 /// of protobuf runtime.
-const _PROTOBUF_VERSION_CHECK: () = ::protobufv3::VERSION_3_4_0;
+const _PROTOBUF_VERSION_CHECK: () = ::protobufv3::VERSION_3_5_0;
 
 // @@protoc_insertion_point(message:google.rpc.Status)
 #[derive(PartialEq,Clone,Default,Debug)]
diff --git a/proto/src/proto/protobuf_v3/testing/control.rs b/proto/src/proto/protobuf_v3/testing/control.rs
index d9acda06..9bb50db3 100644
--- a/proto/src/proto/protobuf_v3/testing/control.rs
+++ b/proto/src/proto/protobuf_v3/testing/control.rs
@@ -1,4 +1,4 @@
-// This file is generated by rust-protobuf 3.4.0. Do not edit
+// This file is generated by rust-protobuf 3.5.0. Do not edit
 // @generated
 
 // https://github.com/rust-lang/rust-clippy/issues/702
@@ -22,7 +22,7 @@
 
 /// Generated files are compatible only with the same version
 /// of protobuf runtime.
-const _PROTOBUF_VERSION_CHECK: () = ::protobufv3::VERSION_3_4_0;
+const _PROTOBUF_VERSION_CHECK: () = ::protobufv3::VERSION_3_5_0;
 
 // @@protoc_insertion_point(message:grpc.testing.PoissonParams)
 #[derive(PartialEq,Clone,Default,Debug)]
@@ -1206,9 +1206,7 @@ impl ::protobufv3::Message for ClientConfig {
             let len = v.compute_size();
             my_size += 1 + ::protobufv3::rt::compute_raw_varint64_size(len) + len;
         }
-        for value in &self.core_list {
-            my_size += ::protobufv3::rt::int32_size(13, *value);
-        };
+        my_size += ::protobufv3::rt::vec_packed_int32_size(13, &self.core_list);
         if self.core_limit != 0 {
             my_size += ::protobufv3::rt::int32_size(14, self.core_limit);
         }
@@ -1261,9 +1259,7 @@ impl ::protobufv3::Message for ClientConfig {
         if let Some(v) = self.histogram_params.as_ref() {
             ::protobufv3::rt::write_message_field_with_cached_size(12, v, os)?;
         }
-        for v in &self.core_list {
-            os.write_int32(13, *v)?;
-        };
+        os.write_repeated_packed_int32(13, &self.core_list)?;
         if self.core_limit != 0 {
             os.write_int32(14, self.core_limit)?;
         }
@@ -2066,9 +2062,7 @@ impl ::protobufv3::Message for ServerConfig {
             let len = v.compute_size();
             my_size += 1 + ::protobufv3::rt::compute_raw_varint64_size(len) + len;
         }
-        for value in &self.core_list {
-            my_size += ::protobufv3::rt::int32_size(10, *value);
-        };
+        my_size += ::protobufv3::rt::vec_packed_int32_size(10, &self.core_list);
         if !self.other_server_api.is_empty() {
             my_size += ::protobufv3::rt::string_size(11, &self.other_server_api);
         }
@@ -2106,9 +2100,7 @@ impl ::protobufv3::Message for ServerConfig {
         if let Some(v) = self.payload_config.as_ref() {
             ::protobufv3::rt::write_message_field_with_cached_size(9, v, os)?;
         }
-        for v in &self.core_list {
-            os.write_int32(10, *v)?;
-        };
+        os.write_repeated_packed_int32(10, &self.core_list)?;
         if !self.other_server_api.is_empty() {
             os.write_string(11, &self.other_server_api)?;
         }
@@ -3923,15 +3915,13 @@ impl ::protobufv3::Message for ScenarioResult {
             let len = value.compute_size();
             my_size += 1 + ::protobufv3::rt::compute_raw_varint64_size(len) + len;
         };
-        for value in &self.server_cores {
-            my_size += ::protobufv3::rt::int32_size(5, *value);
-        };
+        my_size += ::protobufv3::rt::vec_packed_int32_size(5, &self.server_cores);
         if let Some(v) = self.summary.as_ref() {
             let len = v.compute_size();
             my_size += 1 + ::protobufv3::rt::compute_raw_varint64_size(len) + len;
         }
-        my_size += 2 * self.client_success.len() as u64;
-        my_size += 2 * self.server_success.len() as u64;
+        my_size += ::protobufv3::rt::vec_packed_bool_size(7, &self.client_success);
+        my_size += ::protobufv3::rt::vec_packed_bool_size(8, &self.server_success);
         for value in &self.request_results {
             let len = value.compute_size();
             my_size += 1 + ::protobufv3::rt::compute_raw_varint64_size(len) + len;
@@ -3954,18 +3944,12 @@ impl ::protobufv3::Message for ScenarioResult {
         for v in &self.server_stats {
             ::protobufv3::rt::write_message_field_with_cached_size(4, v, os)?;
         };
-        for v in &self.server_cores {
-            os.write_int32(5, *v)?;
-        };
+        os.write_repeated_packed_int32(5, &self.server_cores)?;
         if let Some(v) = self.summary.as_ref() {
             ::protobufv3::rt::write_message_field_with_cached_size(6, v, os)?;
         }
-        for v in &self.client_success {
-            os.write_bool(7, *v)?;
-        };
-        for v in &self.server_success {
-            os.write_bool(8, *v)?;
-        };
+        os.write_repeated_packed_bool(7, &self.client_success)?;
+        os.write_repeated_packed_bool(8, &self.server_success)?;
         for v in &self.request_results {
             ::protobufv3::rt::write_message_field_with_cached_size(9, v, os)?;
         };
diff --git a/proto/src/proto/protobuf_v3/testing/empty.rs b/proto/src/proto/protobuf_v3/testing/empty.rs
index fc2070d4..42363c10 100644
--- a/proto/src/proto/protobuf_v3/testing/empty.rs
+++ b/proto/src/proto/protobuf_v3/testing/empty.rs
@@ -1,4 +1,4 @@
-// This file is generated by rust-protobuf 3.4.0. Do not edit
+// This file is generated by rust-protobuf 3.5.0. Do not edit
 // @generated
 
 // https://github.com/rust-lang/rust-clippy/issues/702
@@ -22,7 +22,7 @@
 
 /// Generated files are compatible only with the same version
 /// of protobuf runtime.
-const _PROTOBUF_VERSION_CHECK: () = ::protobufv3::VERSION_3_4_0;
+const _PROTOBUF_VERSION_CHECK: () = ::protobufv3::VERSION_3_5_0;
 
 // @@protoc_insertion_point(message:grpc.testing.Empty)
 #[derive(PartialEq,Clone,Default,Debug)]
diff --git a/proto/src/proto/protobuf_v3/testing/messages.rs b/proto/src/proto/protobuf_v3/testing/messages.rs
index 8c3559aa..9aada284 100644
--- a/proto/src/proto/protobuf_v3/testing/messages.rs
+++ b/proto/src/proto/protobuf_v3/testing/messages.rs
@@ -1,4 +1,4 @@
-// This file is generated by rust-protobuf 3.4.0. Do not edit
+// This file is generated by rust-protobuf 3.5.0. Do not edit
 // @generated
 
 // https://github.com/rust-lang/rust-clippy/issues/702
@@ -22,7 +22,7 @@
 
 /// Generated files are compatible only with the same version
 /// of protobuf runtime.
-const _PROTOBUF_VERSION_CHECK: () = ::protobufv3::VERSION_3_4_0;
+const _PROTOBUF_VERSION_CHECK: () = ::protobufv3::VERSION_3_5_0;
 
 // @@protoc_insertion_point(message:grpc.testing.BoolValue)
 #[derive(PartialEq,Clone,Default,Debug)]
@@ -1763,9 +1763,7 @@ impl ::protobufv3::Message for ReconnectInfo {
         if self.passed != false {
             my_size += 1 + 1;
         }
-        for value in &self.backoff_ms {
-            my_size += ::protobufv3::rt::int32_size(2, *value);
-        };
+        my_size += ::protobufv3::rt::vec_packed_int32_size(2, &self.backoff_ms);
         my_size += ::protobufv3::rt::unknown_fields_size(self.special_fields.unknown_fields());
         self.special_fields.cached_size().set(my_size as u32);
         my_size
@@ -1775,9 +1773,7 @@ impl ::protobufv3::Message for ReconnectInfo {
         if self.passed != false {
             os.write_bool(1, self.passed)?;
         }
-        for v in &self.backoff_ms {
-            os.write_int32(2, *v)?;
-        };
+        os.write_repeated_packed_int32(2, &self.backoff_ms)?;
         os.write_unknown_fields(self.special_fields.unknown_fields())?;
         ::std::result::Result::Ok(())
     }
diff --git a/proto/src/proto/protobuf_v3/testing/payloads.rs b/proto/src/proto/protobuf_v3/testing/payloads.rs
index 915cda7f..f3f05b47 100644
--- a/proto/src/proto/protobuf_v3/testing/payloads.rs
+++ b/proto/src/proto/protobuf_v3/testing/payloads.rs
@@ -1,4 +1,4 @@
-// This file is generated by rust-protobuf 3.4.0. Do not edit
+// This file is generated by rust-protobuf 3.5.0. Do not edit
 // @generated
 
 // https://github.com/rust-lang/rust-clippy/issues/702
@@ -22,7 +22,7 @@
 
 /// Generated files are compatible only with the same version
 /// of protobuf runtime.
-const _PROTOBUF_VERSION_CHECK: () = ::protobufv3::VERSION_3_4_0;
+const _PROTOBUF_VERSION_CHECK: () = ::protobufv3::VERSION_3_5_0;
 
 // @@protoc_insertion_point(message:grpc.testing.ByteBufferParams)
 #[derive(PartialEq,Clone,Default,Debug)]
diff --git a/proto/src/proto/protobuf_v3/testing/services.rs b/proto/src/proto/protobuf_v3/testing/services.rs
index 8259d703..8c58626f 100644
--- a/proto/src/proto/protobuf_v3/testing/services.rs
+++ b/proto/src/proto/protobuf_v3/testing/services.rs
@@ -1,4 +1,4 @@
-// This file is generated by rust-protobuf 3.4.0. Do not edit
+// This file is generated by rust-protobuf 3.5.0. Do not edit
 // @generated
 
 // https://github.com/rust-lang/rust-clippy/issues/702
@@ -22,7 +22,7 @@
 
 /// Generated files are compatible only with the same version
 /// of protobuf runtime.
-const _PROTOBUF_VERSION_CHECK: () = ::protobufv3::VERSION_3_4_0;
+const _PROTOBUF_VERSION_CHECK: () = ::protobufv3::VERSION_3_5_0;
 
 static file_descriptor_proto_data: &'static [u8] = b"\
     \n\x1bgrpc/testing/services.proto\x12\x0cgrpc.testing\x1a\x1bgrpc/testin\
diff --git a/proto/src/proto/protobuf_v3/testing/stats.rs b/proto/src/proto/protobuf_v3/testing/stats.rs
index bd5782f4..480b4a7d 100644
--- a/proto/src/proto/protobuf_v3/testing/stats.rs
+++ b/proto/src/proto/protobuf_v3/testing/stats.rs
@@ -1,4 +1,4 @@
-// This file is generated by rust-protobuf 3.4.0. Do not edit
+// This file is generated by rust-protobuf 3.5.0. Do not edit
 // @generated
 
 // https://github.com/rust-lang/rust-clippy/issues/702
@@ -22,7 +22,7 @@
 
 /// Generated files are compatible only with the same version
 /// of protobuf runtime.
-const _PROTOBUF_VERSION_CHECK: () = ::protobufv3::VERSION_3_4_0;
+const _PROTOBUF_VERSION_CHECK: () = ::protobufv3::VERSION_3_5_0;
 
 // @@protoc_insertion_point(message:grpc.testing.ServerStats)
 #[derive(PartialEq,Clone,Default,Debug)]
@@ -492,9 +492,7 @@ impl ::protobufv3::Message for HistogramData {
     #[allow(unused_variables)]
     fn compute_size(&self) -> u64 {
         let mut my_size = 0;
-        for value in &self.bucket {
-            my_size += ::protobufv3::rt::uint32_size(1, *value);
-        };
+        my_size += ::protobufv3::rt::vec_packed_uint32_size(1, &self.bucket);
         if self.min_seen != 0. {
             my_size += 1 + 8;
         }
@@ -516,9 +514,7 @@ impl ::protobufv3::Message for HistogramData {
     }
 
     fn write_to_with_cached_sizes(&self, os: &mut ::protobufv3::CodedOutputStream<'_>) -> ::protobufv3::Result<()> {
-        for v in &self.bucket {
-            os.write_uint32(1, *v)?;
-        };
+        os.write_repeated_packed_uint32(1, &self.bucket)?;
         if self.min_seen != 0. {
             os.write_double(2, self.min_seen)?;
         }
diff --git a/proto/src/proto/protobuf_v3/testing/test.rs b/proto/src/proto/protobuf_v3/testing/test.rs
index c51ca595..c0556946 100644
--- a/proto/src/proto/protobuf_v3/testing/test.rs
+++ b/proto/src/proto/protobuf_v3/testing/test.rs
@@ -1,4 +1,4 @@
-// This file is generated by rust-protobuf 3.4.0. Do not edit
+// This file is generated by rust-protobuf 3.5.0. Do not edit
 // @generated
 
 // https://github.com/rust-lang/rust-clippy/issues/702
@@ -22,7 +22,7 @@
 
 /// Generated files are compatible only with the same version
 /// of protobuf runtime.
-const _PROTOBUF_VERSION_CHECK: () = ::protobufv3::VERSION_3_4_0;
+const _PROTOBUF_VERSION_CHECK: () = ::protobufv3::VERSION_3_5_0;
 
 static file_descriptor_proto_data: &'static [u8] = b"\
     \n\x17grpc/testing/test.proto\x12\x0cgrpc.testing\x1a\x18grpc/testing/em\
diff --git a/tests-and-examples/Cargo.toml b/tests-and-examples/Cargo.toml
index 5063599e..218b45cf 100644
--- a/tests-and-examples/Cargo.toml
+++ b/tests-and-examples/Cargo.toml
@@ -20,7 +20,7 @@ futures-util = { version = "0.3", features = ["sink"] }
 futures-timer = "3.0"
 protobuf = { version = "2", optional = true }
 protobufv3 = { package = "protobuf", version = "3.2", optional = true }
-prost = { version = "0.12", optional = true }
+prost = { version = "0.13", optional = true }
 bytes = { version = "1.0", optional = true }
 log = "0.4"
 grpcio = { path = "..", default-features = false, features = ["boringssl"] }
diff --git a/xtask/Cargo.toml b/xtask/Cargo.toml
index f98c8fec..72cd21e3 100644
--- a/xtask/Cargo.toml
+++ b/xtask/Cargo.toml
@@ -7,7 +7,7 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-prost-build = "0.12"
+prost-build = "0.13"
 # Use an old enough version to make sure generated code with TiKV's fork.
 # TODO: use latest one when TiKV's fork is updated
 protoc-rust = "=2.8"