diff --git a/Cargo.lock b/Cargo.lock
index 6ced776..9e3bd92 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -293,9 +293,9 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.12.0"
+version = "1.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7709cef83f0c1f58f666e746a08b21e0085f7440fa6a29cc194d68aac97a4225"
+checksum = "18a6dbe30758c9f83eb00cbea4ac95966305f5a7772f3f42ebfc7fc7eddbd8e1"
 
 [[package]]
 name = "pem"
diff --git a/Cargo.toml b/Cargo.toml
index 167e6e5..c027df6 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 = "1.12"
+once_cell = "1.13"
 percent-encoding = "2.1"
 rcgen = { version = "0.9.2" }
 rustls = "0.20.6"