diff --git a/Cargo.lock b/Cargo.lock
index ce3e151..4410245 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -285,9 +285,9 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.14.0"
+version = "1.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2f7254b99e31cad77da24b08ebf628882739a608578bb1bcdfc1f9c21260d7c0"
+checksum = "e82dad04139b71a90c080c8463fe0dc7902db5192d939bd0950f074d014339e1"
 
 [[package]]
 name = "pem"
diff --git a/Cargo.toml b/Cargo.toml
index 50358a9..d4e4ebb 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 = "1.14"
+once_cell = "1.15"
 percent-encoding = "2.2"
 rcgen = { version = "0.9.3" }
 rustls = "0.20.6"