diff --git a/Cargo.lock b/Cargo.lock
index f1528bc..3837191 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -287,9 +287,9 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.11.0"
+version = "1.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b10983b38c53aebdf33f542c6275b0f58a238129d00c4ae0e6fb59738d783ca"
+checksum = "7709cef83f0c1f58f666e746a08b21e0085f7440fa6a29cc194d68aac97a4225"
 
 [[package]]
 name = "pem"
diff --git a/Cargo.toml b/Cargo.toml
index c8fa0ef..8df3bfc 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 = "1.11"
+once_cell = "1.12"
 percent-encoding = "2.1"
 rcgen = { version = "0.9.2" }
 rustls = "0.20.6"