diff --git a/Cargo.lock b/Cargo.lock
index ffdcdb5..8fe4841 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1951,9 +1951,9 @@ checksum = "cda74da7e1a664f795bb1f8a87ec406fb89a02522cf6e50620d016add6dbbf5c"
 
 [[package]]
 name = "tokio"
-version = "1.6.0"
+version = "1.8.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bd3076b5c8cc18138b8f8814895c11eb4de37114a5d127bafdc5e55798ceef37"
+checksum = "50dae83881bc9b0403dd5b44ea9deed3e939856cc8722d5be37f0d6e5c6d53dd"
 dependencies = [
  "autocfg",
  "bytes",
diff --git a/Cargo.toml b/Cargo.toml
index 81ff81f..86b2d02 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,7 +10,7 @@ edition = "2018"
 [dependencies]
 anyhow = "1.0.40"
 clap = "3.0.0-beta.2"
-tokio = { version = "1.5.0", features = ["macros", "rt-multi-thread"] }
+tokio = { version = "1.8.4", features = ["macros", "rt-multi-thread"] }
 tracing = "0.1.25"
 tracing-subscriber = "0.2.17"
 uuid = { version = "0.8.2", features = ["serde", "v4"] }
diff --git a/judgectl/Cargo.toml b/judgectl/Cargo.toml
index 281955b..757e9e3 100644
--- a/judgectl/Cargo.toml
+++ b/judgectl/Cargo.toml
@@ -9,5 +9,5 @@ anyhow = "1.0.40"
 clap = "3.0.0-beta.2"
 reqwest = { version = "0.11.3", features = ["json"] }
 serde_json = "1.0.64"
-tokio = { version = "1.5.0", features = ["rt", "rt-multi-thread", "macros", "time"] }
+tokio = { version = "1.8.4", features = ["rt", "rt-multi-thread", "macros", "time"] }
 judge-apis = { path = "../judge-apis" }
\ No newline at end of file
diff --git a/problem-loader/Cargo.toml b/problem-loader/Cargo.toml
index ee548e1..2300666 100644
--- a/problem-loader/Cargo.toml
+++ b/problem-loader/Cargo.toml
@@ -10,7 +10,7 @@ pom = { git = "https://github.com/jjs-dev/pps", branch = "master" }
 anyhow = "1.0.40"
 serde_json = "1.0.64"
 async-trait = "0.1.50"
-tokio = { version = "1.5.0", features = ["fs", "sync"] }
+tokio = { version = "1.8.4", features = ["fs", "sync"] }
 fs_extra = "1.2.0"
 mongodb = { git = "https://github.com/mongodb/mongo-rust-driver" }
 url = "2.2.1"
diff --git a/processor/Cargo.toml b/processor/Cargo.toml
index ebfd99b..e9d4fa3 100644
--- a/processor/Cargo.toml
+++ b/processor/Cargo.toml
@@ -10,7 +10,7 @@ pom = { git = "https://github.com/jjs-dev/pps", branch = "master" }
 valuer-api = { git = "https://github.com/jjs-dev/pps", branch = "master" }
 anyhow = "1.0.40"
 tracing = "0.1.25"
-tokio = { version = "1.5.0", features = ["process", "io-util"] }
+tokio = { version = "1.8.4", features = ["process", "io-util"] }
 judge-apis = { path = "../judge-apis" }
 invoker-api = { git = "https://github.com/jjs-dev/invoker" }
 uuid = "0.8.2"
diff --git a/toolchain-loader/Cargo.toml b/toolchain-loader/Cargo.toml
index 6dbd82f..60b27e7 100644
--- a/toolchain-loader/Cargo.toml
+++ b/toolchain-loader/Cargo.toml
@@ -9,5 +9,5 @@ anyhow = "1.0.40"
 serde = { version = "1.0.125", features = ["derive"] }
 tracing = "0.1.26"
 pom = { git = "https://github.com/jjs-dev/pps", branch = "master" }
-tokio = { version = "1.5.0", features = ["fs"] }
+tokio = { version = "1.8.4", features = ["fs"] }
 serde_yaml = "0.8.17"
diff --git a/valuer-client/Cargo.toml b/valuer-client/Cargo.toml
index f1b3736..60c8e8f 100644
--- a/valuer-client/Cargo.toml
+++ b/valuer-client/Cargo.toml
@@ -8,6 +8,6 @@ edition = "2018"
 anyhow = "1.0.40"
 serde = "1.0.125"
 serde_json = "1.0.64"
-tokio = { version = "1.5.0", features = ["process", "io-util", "time"] }
+tokio = { version = "1.8.4", features = ["process", "io-util", "time"] }
 tracing = "0.1.26"
 valuer-api = { git = "https://github.com/jjs-dev/pps", branch = "master" }