diff --git a/Cargo.lock b/Cargo.lock
index 9adb188..f8428c8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -262,9 +262,9 @@ dependencies = [
 
 [[package]]
 name = "mio"
-version = "0.8.3"
+version = "0.8.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "713d550d9b44d89174e066b7a6217ae06234c10cb47819a88290d2b353c31799"
+checksum = "57ee1c23c7c63b0c9250c339ffdc69255f110b298b901b9f6c82547b7b87caaf"
 dependencies = [
  "libc",
  "log",
@@ -503,9 +503,9 @@ checksum = "cda74da7e1a664f795bb1f8a87ec406fb89a02522cf6e50620d016add6dbbf5c"
 
 [[package]]
 name = "tokio"
-version = "1.20.1"
+version = "1.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7a8325f63a7d4774dd041e363b2409ed1c5cbbd0f867795e661df066b2b0a581"
+checksum = "89797afd69d206ccd11fb0ea560a44bbb87731d020670e79416d442919257d42"
 dependencies = [
  "autocfg",
  "bytes",
diff --git a/Cargo.toml b/Cargo.toml
index 5f5e3c3..05a9ce2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -24,7 +24,7 @@ percent-encoding = "2.2"
 rcgen = { version = "0.9.3" }
 rustls = "0.20.6"
 tokio-rustls = "0.23.4"
-tokio = { version = "1.20", features = ["fs", "io-util", "net", "rt-multi-thread", "sync"] }
+tokio = { version = "1.21", features = ["fs", "io-util", "net", "rt-multi-thread", "sync"] }
 url = "2.3.0"
 webpki = "0.22.0"