diff --git a/Cargo.lock b/Cargo.lock
index 9c255bc..8017ce4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -306,9 +306,9 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.9.0"
+version = "1.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "da32515d9f6e6e489d7bc9d84c71b060db7247dc035bbe44eac88cf87486d8d5"
+checksum = "87f3e037eac156d1775da914196f0f37741a274155e34a0b7e427c35d2a2ecb9"
 
 [[package]]
 name = "pem"
diff --git a/Cargo.toml b/Cargo.toml
index a5f46fb..7092ed2 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 = "1.8"
+once_cell = "1.10"
 percent-encoding = "2.1"
 rcgen = { version = "0.9.2" }
 rustls = "0.20.4"