diff --git a/apps/Cargo.toml b/apps/Cargo.toml
index 3c9db1a9e..bd710fd1d 100644
--- a/apps/Cargo.toml
+++ b/apps/Cargo.toml
@@ -23,7 +23,7 @@ default = [ "sfv"]
 [dependencies]
 docopt = "1"
 env_logger = "0.6"
-mio = { version = "0.8", features = ["net", "os-poll"] }
+mio = { version = "1.0", features = ["net", "os-poll"] }
 url = "1"
 log = "0.4"
 octets = { version = "0.2", path = "../octets" }
diff --git a/quiche/Cargo.toml b/quiche/Cargo.toml
index 0b0c0886a..73e2ffa44 100644
--- a/quiche/Cargo.toml
+++ b/quiche/Cargo.toml
@@ -75,7 +75,7 @@ env_logger = "0.6"
 winapi = { version = "0.3", features = ["wincrypt", "ws2def", "ws2ipdef", "ws2tcpip"] }
 
 [dev-dependencies]
-mio = { version = "0.8", features = ["net", "os-poll"] }
+mio = { version = "1.0", features = ["net", "os-poll"] }
 url = "1"
 criterion = "0.4"