diff --git a/Cargo.lock b/Cargo.lock
index 5081619f..855fc268 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1740,9 +1740,9 @@ dependencies = [
 
 [[package]]
 name = "tokio"
-version = "1.39.3"
+version = "1.40.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9babc99b9923bfa4804bd74722ff02c0381021eafa4db9949217e3be8e84fff5"
+checksum = "e2b070231665d27ad9ec9b8df639893f46727666c6767db40317fbe920a5d998"
 dependencies = [
  "backtrace",
  "pin-project-lite",
diff --git a/x509-cert/Cargo.toml b/x509-cert/Cargo.toml
index b0bd6ae4..19366942 100644
--- a/x509-cert/Cargo.toml
+++ b/x509-cert/Cargo.toml
@@ -36,7 +36,7 @@ p256 = "=0.14.0-pre.1"
 rstest = "0.22"
 sha2 = { version = "=0.11.0-pre.4", features = ["oid"] }
 tempfile = "3.5.0"
-tokio = { version = "1.39.3", features = ["macros", "rt"] }
+tokio = { version = "1.40.0", features = ["macros", "rt"] }
 x509-cert-test-support = { path = "./test-support" }
 
 [features]