diff --git a/Cargo.lock b/Cargo.lock
index 0cbad595..0bf3a3c0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2091,8 +2091,9 @@ dependencies = [
 [[package]]
 name = "tower-grpc"
 version = "0.1.0"
-source = "git+https://github.com/tower-rs/tower-grpc#d0df76a934319ad1c18b851d4a341a4223a4a74a"
+source = "git+https://github.com/tower-rs/tower-grpc#01defa830fc72cc38aba3b2035558e03eed8da4b"
 dependencies = [
+ "base64 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "h2 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2109,7 +2110,7 @@ dependencies = [
 [[package]]
 name = "tower-grpc-build"
 version = "0.1.0"
-source = "git+https://github.com/tower-rs/tower-grpc#d0df76a934319ad1c18b851d4a341a4223a4a74a"
+source = "git+https://github.com/tower-rs/tower-grpc#01defa830fc72cc38aba3b2035558e03eed8da4b"
 dependencies = [
  "codegen 0.1.0 (git+https://github.com/carllerche/codegen)",
  "heck 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2154,7 +2155,7 @@ dependencies = [
 [[package]]
 name = "tower-service"
 version = "0.2.0"
-source = "git+https://github.com/tower-rs/tower#68ad8a00f2fc765f031207d3eacc56916bd7efb2"
+source = "git+https://github.com/tower-rs/tower#9f422d29b17007f367749073ad473a033c4dee87"
 dependencies = [
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -2162,7 +2163,7 @@ dependencies = [
 [[package]]
 name = "tower-util"
 version = "0.1.0"
-source = "git+https://github.com/tower-rs/tower#68ad8a00f2fc765f031207d3eacc56916bd7efb2"
+source = "git+https://github.com/tower-rs/tower#9f422d29b17007f367749073ad473a033c4dee87"
 dependencies = [
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "tower-direct-service 0.1.0 (git+https://github.com/tower-rs/tower)",