diff --git a/Cargo.toml b/Cargo.toml
index 992b4b6..e51478d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,13 +19,13 @@ getopts = "0.2.21"
 glob = "0.3"
 log = "0.4"
 mime_guess = "2.0"
-once_cell = "1.5"
+once_cell = "1.8"
 percent-encoding = "2.1"
 rcgen = { version = "0.8.14" }
 rustls = "0.20.0"
 tokio-rustls = "0.23.0"
-tokio = { version = "1.2", features = ["fs", "io-util", "net", "rt-multi-thread", "sync"] }
-url = "2.2.1"
+tokio = { version = "1.12", features = ["fs", "io-util", "net", "rt-multi-thread", "sync"] }
+url = "2.2.2"
 webpki = "0.22.0"
 
 [dev-dependencies]