diff --git a/ext/enveloperb/Cargo.lock b/ext/enveloperb/Cargo.lock
index de2731d..3422735 100644
--- a/ext/enveloperb/Cargo.lock
+++ b/ext/enveloperb/Cargo.lock
@@ -1437,9 +1437,9 @@ dependencies = [
 
 [[package]]
 name = "tokio"
-version = "1.17.0"
+version = "1.18.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2af73ac49756f3f7c01172e34a23e5d0216f6c32333757c2c61feb2bbff5a5ee"
+checksum = "0e050c618355082ae5a89ec63bbf897225d5ffe84c7c4e036874e4d185a5044e"
 dependencies = [
  "bytes",
  "libc",
diff --git a/ext/enveloperb/Cargo.toml b/ext/enveloperb/Cargo.toml
index 65cb716..8c20b2b 100644
--- a/ext/enveloperb/Cargo.toml
+++ b/ext/enveloperb/Cargo.toml
@@ -8,7 +8,7 @@ envelopers = { version = "0.5.1", features = [ "tokio" ] }
 lazy_static = "^0.2.2"
 rb-sys = "0.8.0"
 rutie = { git = "https://github.com/mpalmer/rutie", branch = "rb_sys" }
-tokio = { version = "^1.17.0", features = [ "rt-multi-thread" ] }
+tokio = { version = "^1.18.5", features = [ "rt-multi-thread" ] }
 aws-config = "0.10.1"
 aws-sdk-kms = "0.10.1"
 aws-types = { version = "0.10.1", features = [ "hardcoded-credentials" ] }