diff --git a/Cargo.lock b/Cargo.lock
index 4cb1bc2a..7c23cca6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,5 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "abscissa"
 version = "0.5.1"
@@ -161,12 +163,6 @@ version = "1.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "08c48aae112d48ed9f069b33538ea9e3e90aa263cfa3d1c24309612b1f7472de"
 
-[[package]]
-name = "bytes"
-version = "0.5.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0e4cec68f03f32e44924783795810fa50a7035d8c8ebe78580ad7e6c703fba38"
-
 [[package]]
 name = "canonical-path"
 version = "2.0.2"
@@ -470,9 +466,9 @@ dependencies = [
 
 [[package]]
 name = "pin-project-lite"
-version = "0.1.7"
+version = "0.2.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "282adbf10f2698a7a77f8e983a74b2d18176c19a7fd32a45446139ae7b02b715"
+checksum = "e0a7ae3ac2f1173085d398531c705756c94a4c56843785df85a60c1a0afac116"
 
 [[package]]
 name = "proc-macro2"
@@ -701,11 +697,10 @@ dependencies = [
 
 [[package]]
 name = "tokio"
-version = "0.2.22"
+version = "1.19.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5d34ca54d84bf2b5b4d7d31e901a8464f7b60ac145a284fba25ceb801f2ddccd"
+checksum = "c51a52ed6686dd62c320f9b89299e9dfb46f730c7a48e635c19f21d116cb1439"
 dependencies = [
- "bytes",
  "pin-project-lite",
 ]
 
diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml
index 21106d11..c8c1d3ce 100644
--- a/tokio/Cargo.toml
+++ b/tokio/Cargo.toml
@@ -14,4 +14,4 @@ maintenance = { status = "actively-developed" }
 
 [dependencies]
 abscissa_core = { version = "0.5", path = "../core" }
-tokio = "0.2"
+tokio = "1.19"