diff --git a/Cargo.lock b/Cargo.lock
index 60d777d..67a080d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -313,12 +313,6 @@ dependencies = [
  "libc",
 ]
 
-[[package]]
-name = "once_cell"
-version = "1.7.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "af8b08b04175473088b46763e51ee54da5f9a164bc162f615b91bc179dbf15a3"
-
 [[package]]
 name = "parking_lot"
 version = "0.12.1"
@@ -592,9 +586,9 @@ checksum = "cda74da7e1a664f795bb1f8a87ec406fb89a02522cf6e50620d016add6dbbf5c"
 
 [[package]]
 name = "tokio"
-version = "1.20.1"
+version = "1.20.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7a8325f63a7d4774dd041e363b2409ed1c5cbbd0f867795e661df066b2b0a581"
+checksum = "eb78f30e4b41e98ca4cce5acb51168a033839a7af9e42b380355808e14e98ee0"
 dependencies = [
  "autocfg",
  "bytes",
@@ -602,7 +596,6 @@ dependencies = [
  "memchr",
  "mio",
  "num_cpus",
- "once_cell",
  "parking_lot",
  "pin-project-lite",
  "signal-hook-registry",
diff --git a/server/Cargo.toml b/server/Cargo.toml
index 090bab0..e87e0b7 100644
--- a/server/Cargo.toml
+++ b/server/Cargo.toml
@@ -11,7 +11,7 @@ tungstenite = "0.17.3"
 tokio-tungstenite = "0.17.2"
 futures-channel = "0.3.23"
 futures-util = "0.3.23"
-tokio = { version = "1.20.1", features = ["full"] }
+tokio = { version = "1.20.4", features = ["full"] }
 log = "0.4.17"
 env_logger = "0.9.0"
 url = "2.2.2"