diff --git a/Cargo.lock b/Cargo.lock
index 6e562d0..4606c9d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -275,9 +275,9 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.17.1"
+version = "1.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
+checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
 
 [[package]]
 name = "pem"
diff --git a/Cargo.toml b/Cargo.toml
index 4c44428..746ee34 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,7 +19,7 @@ getopts = "0.2.21"
 glob = "0.3"
 log = "0.4"
 mime_guess = "2.0"
-once_cell = "1.17"
+once_cell = "1.18"
 percent-encoding = "2.2"
 rcgen = { version = "0.10.0" }
 rustls = "0.21.1"