diff --git a/Cargo.lock b/Cargo.lock
index 67511fa5..3ce66f8b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -22,7 +22,7 @@ dependencies = [
  "futures-channel",
  "futures-util",
  "smallvec",
- "tokio",
+ "tokio 0.2.24",
 ]
 
 [[package]]
@@ -48,12 +48,13 @@ checksum = "739f4a8db6605981345c5654f3a85b056ce52f37a39d34da03f25bf2151ea16e"
 
 [[package]]
 name = "ahash"
-version = "0.5.10"
+version = "0.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "19fac972e53443ba111b1ff866e9d3b6484df5c05030e13bc7c6a1ebc802e983"
+checksum = "a75b7e6a93ecd6dbd2c225154d0fa7f86205574ecaa6c87429fb5f66ee677c44"
 dependencies = [
  "getrandom 0.2.0",
  "lazy_static",
+ "version_check",
 ]
 
 [[package]]
@@ -193,9 +194,9 @@ dependencies = [
 
 [[package]]
 name = "async-rustls"
-version = "0.1.2"
+version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7f38092e8f467f47aadaff680903c7cbfeee7926b058d7f40af2dd4c878fbdee"
+checksum = "9c86f33abd5a4f3e2d6d9251a9e0c6a7e52eb1113caf893dae8429bf4a53f378"
 dependencies = [
  "futures-lite",
  "rustls",
@@ -215,7 +216,7 @@ dependencies = [
  "async-mutex",
  "async-process",
  "blocking",
- "crossbeam-utils 0.8.1",
+ "crossbeam-utils",
  "futures-channel",
  "futures-core",
  "futures-io",
@@ -251,9 +252,9 @@ dependencies = [
 
 [[package]]
 name = "atoi"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5c897df197d57c25b37df9d8fa2f93ddbfeee9ebd2264350ac79c8ec4b795885"
+checksum = "616896e05fc0e2649463a93a15183c6a16bf03413a7af88ef1285ddedfa9cda5"
 dependencies = [
  "num-traits",
 ]
@@ -293,12 +294,6 @@ version = "0.2.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a4521f3e3d031370679b3b140beb36dfe4801b09ac77e30c61941f97df3ef28b"
 
-[[package]]
-name = "base64"
-version = "0.12.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3441f0f7b02788e948e47f457ca01f1d7e6d92c693bc132c22b087d3141c03ff"
-
 [[package]]
 name = "base64"
 version = "0.13.0"
@@ -426,6 +421,12 @@ version = "0.5.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0e4cec68f03f32e44924783795810fa50a7035d8c8ebe78580ad7e6c703fba38"
 
+[[package]]
+name = "bytes"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e0dcbc35f504eb6fc275a6d20e4ebcda18cf50d40ba6fabff8c711fa16cb3b16"
+
 [[package]]
 name = "cache-padded"
 version = "1.1.1"
@@ -667,16 +668,6 @@ dependencies = [
  "itertools",
 ]
 
-[[package]]
-name = "crossbeam-channel"
-version = "0.4.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b153fe7cbef478c567df0f972e02e6d736db11affe43dfc9c56a9374d1adfb87"
-dependencies = [
- "crossbeam-utils 0.7.2",
- "maybe-uninit",
-]
-
 [[package]]
 name = "crossbeam-channel"
 version = "0.5.0"
@@ -684,7 +675,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dca26ee1f8d361640700bde38b2c37d8c22b3ce2d360e1fc1c74ea4b0aa7d775"
 dependencies = [
  "cfg-if 1.0.0",
- "crossbeam-utils 0.8.1",
+ "crossbeam-utils",
 ]
 
 [[package]]
@@ -695,7 +686,7 @@ checksum = "94af6efb46fef72616855b036a624cf27ba656ffc9be1b9a3c931cfc7749a9a9"
 dependencies = [
  "cfg-if 1.0.0",
  "crossbeam-epoch",
- "crossbeam-utils 0.8.1",
+ "crossbeam-utils",
 ]
 
 [[package]]
@@ -706,7 +697,7 @@ checksum = "a1aaa739f95311c2c7887a76863f500026092fb1dce0161dab577e559ef3569d"
 dependencies = [
  "cfg-if 1.0.0",
  "const_fn",
- "crossbeam-utils 0.8.1",
+ "crossbeam-utils",
  "lazy_static",
  "memoffset",
  "scopeguard",
@@ -714,24 +705,12 @@ dependencies = [
 
 [[package]]
 name = "crossbeam-queue"
-version = "0.2.3"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "774ba60a54c213d409d5353bda12d49cd68d14e45036a285234c8d6f91f92570"
+checksum = "0f6cb3c7f5b8e51bc3ebb73a2327ad4abdbd119dc13223f14f961d2f38486756"
 dependencies = [
- "cfg-if 0.1.10",
- "crossbeam-utils 0.7.2",
- "maybe-uninit",
-]
-
-[[package]]
-name = "crossbeam-utils"
-version = "0.7.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c3c7c73a2d1e9fc0886a08b93e98eb643461230d5f1925e4036204d5f2e261a8"
-dependencies = [
- "autocfg 1.0.1",
- "cfg-if 0.1.10",
- "lazy_static",
+ "cfg-if 1.0.0",
+ "crossbeam-utils",
 ]
 
 [[package]]
@@ -747,9 +726,9 @@ dependencies = [
 
 [[package]]
 name = "crypto-mac"
-version = "0.9.1"
+version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "58bcd97a54c7ca5ce2f6eb16f6bede5b0ab5f0055fedc17d2f0b4466e21671ca"
+checksum = "4857fd85a0c34b3c3297875b747c1e02e06b6a0ea32dd892d8192b9ce0813ea6"
 dependencies = [
  "generic-array 0.14.4",
  "subtle",
@@ -1201,9 +1180,9 @@ checksum = "644f9158b2f133fd50f5fb3242878846d9eb792e445c893805ff0e3824006e35"
 
 [[package]]
 name = "hmac"
-version = "0.9.0"
+version = "0.10.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "deae6d9dbb35ec2c502d62b8f7b1c000a0822c3b0794ba36b3149c0a1c840dff"
+checksum = "c1441c6b1e930e2817404b5046f1f989899143a12bf92de603b69f4e0aee1e15"
 dependencies = [
  "crypto-mac",
  "digest 0.9.0",
@@ -1429,12 +1408,6 @@ version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7ffc5c5338469d4d3ea17d269fa8ea3512ad247247c30bd2df69e68309ed0a08"
 
-[[package]]
-name = "maybe-uninit"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "60302e4db3a61da70c0cb7991976248362f30319e88850c487b9b95bbf059e00"
-
 [[package]]
 name = "md-5"
 version = "0.9.1"
@@ -1833,7 +1806,7 @@ version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f4c220d01f863d13d96ca82359d1e81e64a7c6bf0637bcde7b2349630addf0c6"
 dependencies = [
- "base64 0.13.0",
+ "base64",
  "once_cell",
  "regex",
 ]
@@ -2116,9 +2089,9 @@ version = "1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ab346ac5921dc62ffa9f89b7a773907511cdfa5490c572ae9be1be33e8afa4a"
 dependencies = [
- "crossbeam-channel 0.5.0",
+ "crossbeam-channel",
  "crossbeam-deque",
- "crossbeam-utils 0.8.1",
+ "crossbeam-utils",
  "lazy_static",
  "num_cpus",
 ]
@@ -2235,11 +2208,11 @@ dependencies = [
 
 [[package]]
 name = "rustls"
-version = "0.18.1"
+version = "0.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5d1126dcf58e93cee7d098dbda643b5f92ed724f1f6a63007c1116eed6700c81"
+checksum = "064fd21ff87c6e87ed4506e68beb42459caa4a0e2eb144932e6776768556980b"
 dependencies = [
- "base64 0.12.3",
+ "base64",
  "log",
  "ring",
  "sct",
@@ -2521,7 +2494,7 @@ dependencies = [
  "sqlx-rt",
  "sqlx-test",
  "time 0.2.23",
- "tokio",
+ "tokio 0.2.24",
  "trybuild",
  "url",
 ]
@@ -2556,7 +2529,7 @@ dependencies = [
  "serde",
  "serde_json",
  "sqlx",
- "tokio",
+ "tokio 0.2.24",
  "url",
 ]
 
@@ -2564,20 +2537,20 @@ dependencies = [
 name = "sqlx-core"
 version = "0.4.0"
 dependencies = [
- "ahash 0.5.10",
+ "ahash 0.6.2",
  "atoi",
- "base64 0.13.0",
+ "base64",
  "bigdecimal",
  "bit-vec",
  "bitflags",
  "bstr",
  "byteorder",
- "bytes",
+ "bytes 0.6.0",
  "chrono",
  "crc",
- "crossbeam-channel 0.4.4",
+ "crossbeam-channel",
  "crossbeam-queue",
- "crossbeam-utils 0.7.2",
+ "crossbeam-utils",
  "digest 0.9.0",
  "either",
  "encoding_rs",
@@ -2716,7 +2689,7 @@ dependencies = [
  "async-std",
  "native-tls",
  "once_cell",
- "tokio",
+ "tokio 0.2.24",
  "tokio-native-tls",
  "tokio-rustls",
 ]
@@ -2730,7 +2703,7 @@ dependencies = [
  "dotenv",
  "env_logger",
  "sqlx",
- "tokio",
+ "tokio 0.2.24",
 ]
 
 [[package]]
@@ -3057,7 +3030,7 @@ version = "0.2.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "099837d3464c16a808060bb3f02263b412f6fafcb5d01c533d309985fbeebe48"
 dependencies = [
- "bytes",
+ "bytes 0.5.6",
  "fnv",
  "futures-core",
  "iovec",
@@ -3075,6 +3048,16 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
+[[package]]
+name = "tokio"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "720ba21c25078711bf456d607987d95bce90f7c3bea5abe1db587862e7a1e87c"
+dependencies = [
+ "autocfg 1.0.1",
+ "pin-project-lite 0.2.0",
+]
+
 [[package]]
 name = "tokio-macros"
 version = "0.2.6"
@@ -3088,23 +3071,22 @@ dependencies = [
 
 [[package]]
 name = "tokio-native-tls"
-version = "0.1.0"
+version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cd608593a919a8e05a7d1fc6df885e40f6a88d3a70a3a7eff23ff27964eda069"
+checksum = "501c8252b73bd01379aaae1521523c2629ff1bc6ea46c29e0baff515cee60f1b"
 dependencies = [
  "native-tls",
- "tokio",
+ "tokio 0.3.6",
 ]
 
 [[package]]
 name = "tokio-rustls"
-version = "0.14.1"
+version = "0.21.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e12831b255bcfa39dc0436b01e19fea231a37db570686c06ee72c423479f889a"
+checksum = "609ada6f5bf21315925c6e43d78dc51fba5c5968a995f95345b4781cc06f37eb"
 dependencies = [
- "futures-core",
  "rustls",
- "tokio",
+ "tokio 0.3.6",
  "webpki",
 ]
 
@@ -3356,9 +3338,9 @@ dependencies = [
 
 [[package]]
 name = "webpki-roots"
-version = "0.20.0"
+version = "0.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0f20dea7535251981a9670857150d571846545088359b28e4951d350bdaf179f"
+checksum = "82015b7e0b8bad8185994674a13a93306bea76cf5a16c5a181382fd3a5ec2376"
 dependencies = [
  "webpki",
 ]
diff --git a/sqlx-core/Cargo.toml b/sqlx-core/Cargo.toml
index c65c2f6d..37072adf 100644
--- a/sqlx-core/Cargo.toml
+++ b/sqlx-core/Cargo.toml
@@ -53,30 +53,30 @@ _tls-rustls = [ "rustls", "webpki", "webpki-roots" ]
 offline = [ "serde", "either/serde" ]
 
 [dependencies]
-ahash = "0.5"
-atoi = "0.3.2"
+ahash = "0.6.2"
+atoi = "0.4.0"
 sqlx-rt = { path = "../sqlx-rt", version = "0.2.0" }
 base64 = { version = "0.13.0", default-features = false, optional = true, features = [ "std" ] }
 bigdecimal_ = { version = "0.2.0", optional = true, package = "bigdecimal" }
-rust_decimal = { version = "1.7.0", optional = true }
+rust_decimal = { version = "1.8.1", optional = true }
 bit-vec = { version = "0.6.2", optional = true }
 bitflags = { version = "1.2.1", default-features = false }
-bytes = "0.5.4"
+bytes = "0.6.0"
 byteorder = { version = "1.3.4", default-features = false, features = [ "std" ] }
 chrono = { version = "0.4.11", default-features = false, features = [ "clock" ], optional = true }
 crc = { version = "1.8.1", optional = true }
-crossbeam-queue = "0.2.1"
-crossbeam-channel = "0.4.2"
-crossbeam-utils = { version = "0.7.2", default-features = false }
+crossbeam-queue = "0.3.1"
+crossbeam-channel = "0.5.0"
+crossbeam-utils = { version = "0.8.1", default-features = false }
 digest = { version = "0.9.0", default-features = false, optional = true, features = [ "std" ] }
 encoding_rs = { version = "0.8.23", optional = true }
 either = "1.5.3"
 futures-channel = { version = "0.3.5", default-features = false, features = [ "sink", "alloc", "std" ] }
 futures-core = { version = "0.3.5", default-features = false }
 futures-util = { version = "0.3.5", features = [ "sink" ] }
-generic-array = { version = "0.14.2", default-features = false, optional = true }
+generic-array = { version = "0.14.4", default-features = false, optional = true }
 hex = "0.4.2"
-hmac = { version = "0.9.0", default-features = false, optional = true }
+hmac = { version = "0.10.1", default-features = false, optional = true }
 itoa = "0.4.5"
 ipnetwork = { version = "0.17.0", default-features = false, optional = true }
 libc = "0.2.71"
@@ -84,14 +84,14 @@ libsqlite3-sys = { version = "0.20.1", optional = true, default-features = false
 log = { version = "0.4.8", default-features = false }
 md-5 = { version = "0.9.0", default-features = false, optional = true }
 memchr = { version = "2.3.3", default-features = false }
-num-bigint = { version = "0.3.0", default-features = false, optional = true, features = [ "std" ] }
-once_cell = "1.4.0"
+num-bigint = { version = "0.3.1", default-features = false, optional = true, features = [ "std" ] }
+once_cell = "1.5.2"
 percent-encoding = "2.1.0"
 parking_lot = "0.11.0"
 rand = { version = "0.7.3", default-features = false, optional = true, features = [ "std" ] }
 regex = { version = "1.3.9", optional = true }
 rsa = { version = "0.3.0", optional = true }
-rustls = { version = "0.18.1", features = [ "dangerous_configuration" ], optional = true }
+rustls = { version = "0.19.0", features = [ "dangerous_configuration" ], optional = true }
 serde = { version = "1.0.106", features = [ "derive", "rc" ], optional = true }
 serde_json = { version = "1.0.51", features = [ "raw_value" ], optional = true }
 sha-1 = { version = "0.9.0", default-features = false, optional = true }
@@ -103,7 +103,7 @@ smallvec = "1.4.0"
 url = { version = "2.1.1", default-features = false }
 uuid = { version = "0.8.1", default-features = false, optional = true, features = [ "std" ] }
 webpki = { version = "0.21.3", optional = true }
-webpki-roots = { version = "0.20.0", optional = true }
+webpki-roots = { version = "0.21.0", optional = true }
 whoami = "1.0.1"
 stringprep = "0.1.2"
 bstr = { version = "0.2.14", default-features = false, features = [ "std" ], optional = true }
diff --git a/sqlx-core/src/connection.rs b/sqlx-core/src/connection.rs
index 28d8f188..a7d1438d 100644
--- a/sqlx-core/src/connection.rs
+++ b/sqlx-core/src/connection.rs
@@ -2,7 +2,6 @@ use crate::database::{Database, HasStatementCache};
 use crate::error::Error;
 use crate::transaction::Transaction;
 use futures_core::future::BoxFuture;
-use futures_core::Future;
 use log::LevelFilter;
 use std::fmt::Debug;
 use std::str::FromStr;
@@ -51,9 +50,9 @@ pub trait Connection: Send {
     /// })).await
     /// # }
     /// ```
-    fn transaction<F, R, E>(&mut self, callback: F) -> BoxFuture<Result<R, E>>
+    fn transaction<F, R, E>(&mut self, callback: F) -> BoxFuture<'_, Result<R, E>>
     where
-        for<'c> F: FnOnce(&'c mut Transaction<Self::Database>) -> BoxFuture<'c, Result<R, E>>
+        for<'c> F: FnOnce(&'c mut Transaction<'_, Self::Database>) -> BoxFuture<'c, Result<R, E>>
             + 'static
             + Send
             + Sync,
diff --git a/sqlx-core/src/mysql/connection/auth.rs b/sqlx-core/src/mysql/connection/auth.rs
index 1de59d51..3e625c1c 100644
--- a/sqlx-core/src/mysql/connection/auth.rs
+++ b/sqlx-core/src/mysql/connection/auth.rs
@@ -1,4 +1,4 @@
-use bytes::buf::ext::Chain;
+use bytes::buf::Chain;
 use bytes::Bytes;
 use digest::{Digest, FixedOutput};
 use generic_array::GenericArray;
diff --git a/sqlx-core/src/mysql/connection/establish.rs b/sqlx-core/src/mysql/connection/establish.rs
index f5549b60..0018227a 100644
--- a/sqlx-core/src/mysql/connection/establish.rs
+++ b/sqlx-core/src/mysql/connection/establish.rs
@@ -8,7 +8,7 @@ use crate::mysql::protocol::connect::{
 };
 use crate::mysql::protocol::Capabilities;
 use crate::mysql::{MySqlConnectOptions, MySqlConnection, MySqlSslMode};
-use bytes::buf::BufExt;
+use bytes::buf::Buf as _;
 
 impl MySqlConnection {
     pub(crate) async fn establish(options: &MySqlConnectOptions) -> Result<Self, Error> {
diff --git a/sqlx-core/src/mysql/protocol/connect/handshake.rs b/sqlx-core/src/mysql/protocol/connect/handshake.rs
index d4f6f48c..4a247033 100644
--- a/sqlx-core/src/mysql/protocol/connect/handshake.rs
+++ b/sqlx-core/src/mysql/protocol/connect/handshake.rs
@@ -1,5 +1,4 @@
-use bytes::buf::ext::Chain;
-use bytes::buf::BufExt as _;
+use bytes::buf::Chain;
 use bytes::{Buf, Bytes};
 
 use crate::error::Error;
diff --git a/sqlx-core/src/pool/inner.rs b/sqlx-core/src/pool/inner.rs
index 8e128659..11f765f6 100644
--- a/sqlx-core/src/pool/inner.rs
+++ b/sqlx-core/src/pool/inner.rs
@@ -41,13 +41,13 @@ impl<DB: Database> SharedPool<DB> {
 
     pub(super) async fn close(&self) {
         self.is_closed.store(true, Ordering::Release);
-        while let Ok(waker) = self.waiters.pop() {
+        while let Some(waker) = self.waiters.pop() {
             waker.wake();
         }
 
         // ensure we wait until the pool is actually closed
         while self.size() > 0 {
-            if let Ok(idle) = self.idle_conns.pop() {
+            if let Some(idle) = self.idle_conns.pop() {
                 if let Err(e) = Floating::from_idle(idle, self).close().await {
                     log::warn!("error occurred while closing the pool connection: {}", e);
                 }
@@ -72,7 +72,7 @@ impl<DB: Database> SharedPool<DB> {
             return None;
         }
 
-        Some(Floating::from_idle(self.idle_conns.pop().ok()?, self))
+        Some(Floating::from_idle(self.idle_conns.pop()?, self))
     }
 
     pub(super) fn release(&self, mut floating: Floating<'_, Live<DB>>) {
@@ -83,11 +83,16 @@ impl<DB: Database> SharedPool<DB> {
             }
         }
 
-        self.idle_conns
+        let is_ok = self
+            .idle_conns
             .push(floating.into_idle().into_leakable())
-            .expect("BUG: connection queue overflow in release()");
+            .is_ok();
 
-        if let Ok(waker) = self.waiters.pop() {
+        if !is_ok {
+            panic!("BUG: connection queue overflow in release()");
+        }
+
+        if let Some(waker) = self.waiters.pop() {
             waker.wake();
         }
     }
@@ -331,9 +336,11 @@ fn spawn_reaper<DB: Database>(pool: &Arc<SharedPool<DB>>) {
 
             for conn in keep {
                 // return these connections to the pool first
-                pool.idle_conns
-                    .push(conn.into_leakable())
-                    .expect("BUG: connection queue overflow in spawn_reaper");
+                let is_ok = pool.idle_conns.push(conn.into_leakable()).is_ok();
+
+                if !is_ok {
+                    panic!("BUG: connection queue overflow in spawn_reaper");
+                }
             }
 
             for conn in reap {
@@ -379,7 +386,7 @@ impl Drop for DecrementSizeGuard<'_> {
         assert!(!self.dropped, "double-dropped!");
         self.dropped = true;
         self.size.fetch_sub(1, Ordering::SeqCst);
-        if let Ok(waker) = self.waiters.pop() {
+        if let Some(waker) = self.waiters.pop() {
             waker.wake();
         }
     }
diff --git a/sqlx-core/src/pool/options.rs b/sqlx-core/src/pool/options.rs
index ff12968d..fb89d99b 100644
--- a/sqlx-core/src/pool/options.rs
+++ b/sqlx-core/src/pool/options.rs
@@ -238,9 +238,14 @@ async fn init_min_connections<DB: Database>(pool: &SharedPool<DB>) -> Result<(),
             // [connect] will raise an error when past deadline
             // [connect] returns None if its okay to retry
             if let Some(conn) = pool.connection(deadline, guard).await? {
-                pool.idle_conns
+                let is_ok = pool
+                    .idle_conns
                     .push(conn.into_idle().into_leakable())
-                    .expect("BUG: connection queue overflow in init_min_connections");
+                    .is_ok();
+
+                if !is_ok {
+                    panic!("BUG: connection queue overflow in init_min_connections");
+                }
             }
         }
     }
diff --git a/sqlx-rt/Cargo.toml b/sqlx-rt/Cargo.toml
index 9754ef95..447a5fcb 100644
--- a/sqlx-rt/Cargo.toml
+++ b/sqlx-rt/Cargo.toml
@@ -28,12 +28,12 @@ _tls-rustls = [ ]
 
 [dependencies]
 async-native-tls = { version = "0.3.3", optional = true }
-async-rustls = { version = "0.1.1", optional = true }
+async-rustls = { version = "0.2.0", optional = true }
 actix-rt = { version = "1.1.1", optional = true }
 actix-threadpool = { version = "0.3.2", optional = true }
 async-std = { version = "1.6.5", features = [ "unstable" ], optional = true }
 tokio = { version = "0.2.21", optional = true, features = [ "blocking", "stream", "fs", "tcp", "uds", "macros", "rt-core", "rt-threaded", "time", "dns", "io-util" ] }
-tokio-native-tls = { version = "0.1.0", optional = true }
-tokio-rustls = { version = "0.14.0", optional = true }
+tokio-native-tls = { version = "0.2.0", optional = true }
+tokio-rustls = { version = "0.21.1", optional = true }
 native-tls = { version = "0.2.4", optional = true }
 once_cell = { version = "1.4", features = ["std"], optional = true }