diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 8b4ec77d7b..40f67a1e41 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -120,8 +120,8 @@ jobs:
       with:
         version: ${{ env.CARGO_MAKE_VERSION }}
 
-    - name: cargo make all-features
-      run: cargo make all-features
+    - name: cargo make no-default-features 
+      run: cargo make no-default-features 
 
     - name: cargo make build-bench
       if: matrix.version == 'nightly'
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d6174d7198..32e4d2ca81 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,17 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 All notes should be prepended with the location of the change, e.g. `(proto)` or `(resolver)`.
 
+## 0.20.4
+
+### Fixed
+
+- (all) updated tokio dependencies to 1.16 #1623
+- (all) removed audit chrono due to rustsec audit failure (backport) #1623
+
+### Changed
+
+- (all) Increased MSRV to 1.51
+
 ## 0.20.3
 
 ### Fixed
diff --git a/Cargo.lock b/Cargo.lock
index cf1f0876ff..2f7ebb1484 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -165,7 +165,7 @@ dependencies = [
 
 [[package]]
 name = "async-std-resolver"
-version = "0.20.3"
+version = "0.20.4"
 dependencies = [
  "async-std",
  "async-trait",
@@ -686,7 +686,7 @@ checksum = "7245cd7449cc792608c3c8a9eaf69bd4eabbabf802713748fd739c98b82f0747"
 dependencies = [
  "bytes",
  "fnv",
- "itoa 0.4.7",
+ "itoa",
 ]
 
 [[package]]
@@ -749,12 +749,6 @@ version = "0.4.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dd25036021b0de88a0aff6b850051563c6516d0bf53f8638938edbb9de732736"
 
-[[package]]
-name = "itoa"
-version = "1.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1aab8fc367588b89dcee83ab0fd66b72b50b72fa1904d7095045ace2b0c81c35"
-
 [[package]]
 name = "js-sys"
 version = "0.3.48"
@@ -937,15 +931,6 @@ dependencies = [
  "libc",
 ]
 
-[[package]]
-name = "num_threads"
-version = "0.1.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97ba99ba6393e2c3734791401b66902d981cb03bf190af674ca69949b6d5fb15"
-dependencies = [
- "libc",
-]
-
 [[package]]
 name = "object"
 version = "0.23.0"
@@ -1493,13 +1478,12 @@ dependencies = [
 
 [[package]]
 name = "time"
-version = "0.3.7"
+version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "004cbc98f30fa233c61a38bc77e96a9106e65c88f2d3bef182ae952027e5753d"
+checksum = "41effe7cfa8af36f439fac33861b66b049edc6f9a32331e2312660529c1c24ad"
 dependencies = [
- "itoa 1.0.1",
+ "itoa",
  "libc",
- "num_threads",
  "time-macros",
 ]
 
@@ -1629,7 +1613,7 @@ dependencies = [
 
 [[package]]
 name = "trust-dns"
-version = "0.20.3"
+version = "0.20.4"
 dependencies = [
  "clap",
  "env_logger",
@@ -1653,7 +1637,7 @@ dependencies = [
 
 [[package]]
 name = "trust-dns-client"
-version = "0.20.3"
+version = "0.20.4"
 dependencies = [
  "cfg-if 1.0.0",
  "data-encoding",
@@ -1678,7 +1662,7 @@ dependencies = [
 
 [[package]]
 name = "trust-dns-compatibility"
-version = "0.20.3"
+version = "0.20.4"
 dependencies = [
  "data-encoding",
  "env_logger",
@@ -1691,7 +1675,7 @@ dependencies = [
 
 [[package]]
 name = "trust-dns-https"
-version = "0.20.3"
+version = "0.20.4"
 dependencies = [
  "bytes",
  "cfg-if 1.0.0",
@@ -1714,7 +1698,7 @@ dependencies = [
 
 [[package]]
 name = "trust-dns-integration"
-version = "0.20.3"
+version = "0.20.4"
 dependencies = [
  "env_logger",
  "futures",
@@ -1738,7 +1722,7 @@ dependencies = [
 
 [[package]]
 name = "trust-dns-native-tls"
-version = "0.20.3"
+version = "0.20.4"
 dependencies = [
  "futures-channel",
  "futures-util",
@@ -1750,7 +1734,7 @@ dependencies = [
 
 [[package]]
 name = "trust-dns-openssl"
-version = "0.20.3"
+version = "0.20.4"
 dependencies = [
  "futures-channel",
  "futures-util",
@@ -1762,7 +1746,7 @@ dependencies = [
 
 [[package]]
 name = "trust-dns-proto"
-version = "0.20.3"
+version = "0.20.4"
 dependencies = [
  "async-trait",
  "backtrace",
@@ -1794,7 +1778,7 @@ dependencies = [
 
 [[package]]
 name = "trust-dns-resolver"
-version = "0.20.3"
+version = "0.20.4"
 dependencies = [
  "cfg-if 1.0.0",
  "env_logger",
@@ -1824,7 +1808,7 @@ dependencies = [
 
 [[package]]
 name = "trust-dns-rustls"
-version = "0.20.3"
+version = "0.20.4"
 dependencies = [
  "futures-channel",
  "futures-io",
@@ -1840,7 +1824,7 @@ dependencies = [
 
 [[package]]
 name = "trust-dns-server"
-version = "0.20.3"
+version = "0.20.4"
 dependencies = [
  "async-trait",
  "bytes",
@@ -1872,7 +1856,7 @@ dependencies = [
 
 [[package]]
 name = "trust-dns-util"
-version = "0.20.3"
+version = "0.20.4"
 dependencies = [
  "clap",
  "console",
diff --git a/bin/Cargo.toml b/bin/Cargo.toml
index 56683bed83..09fc0c875b 100644
--- a/bin/Cargo.toml
+++ b/bin/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "trust-dns"
-version = "0.20.3"
+version = "0.20.4"
 authors = ["Benjamin Fry <benjaminfry@me.com>"]
 edition = "2018"
 
@@ -77,18 +77,18 @@ log = "0.4"
 rustls = { version = "0.19", optional = true }
 time = "0.3"
 tokio = { version = "1.0", features = ["time"] }
-trust-dns-client = { version = "0.20.3", path = "../crates/client" }
-trust-dns-openssl = { version = "0.20.3", path = "../crates/openssl", optional = true }
-trust-dns-proto = { version = "0.20.3", path = "../crates/proto" }
-trust-dns-rustls = { version = "0.20.3", path = "../crates/rustls", optional = true }
-trust-dns-server = { version = "0.20.3", path = "../crates/server" }
+trust-dns-client = { version = "0.20.4", path = "../crates/client" }
+trust-dns-openssl = { version = "0.20.4", path = "../crates/openssl", optional = true }
+trust-dns-proto = { version = "0.20.4", path = "../crates/proto" }
+trust-dns-rustls = { version = "0.20.4", path = "../crates/rustls", optional = true }
+trust-dns-server = { version = "0.20.4", path = "../crates/server" }
 
 [dev-dependencies]
 env_logger = "0.8"
 native-tls = "0.2"
 regex = "1.3.4"
-trust-dns-proto = { version = "0.20.3", path = "../crates/proto", features = ["testing"] }
-trust-dns-native-tls = { version = "0.20.3", path = "../crates/native-tls" }
-trust-dns-https = { version = "0.20.3", path = "../crates/https" }
-trust-dns-resolver = { version = "0.20.3", path = "../crates/resolver" }
+trust-dns-proto = { version = "0.20.4", path = "../crates/proto", features = ["testing"] }
+trust-dns-native-tls = { version = "0.20.4", path = "../crates/native-tls" }
+trust-dns-https = { version = "0.20.4", path = "../crates/https" }
+trust-dns-resolver = { version = "0.20.4", path = "../crates/resolver" }
 webpki-roots = "0.21"
diff --git a/crates/async-std-resolver/Cargo.toml b/crates/async-std-resolver/Cargo.toml
index 08ca72fd61..6e0e2b7c12 100644
--- a/crates/async-std-resolver/Cargo.toml
+++ b/crates/async-std-resolver/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "async-std-resolver"
-version = "0.20.3"
+version = "0.20.4"
 authors = ["Benjamin Fry <benjaminfry@me.com>"]
 edition = "2018"
 
@@ -69,8 +69,8 @@ async-trait = "0.1.36"
 futures-io = { version = "0.3.5", default-features = false, features = ["std"] }
 futures-util = { version = "0.3.5", default-features = false, features = ["std"] }
 pin-utils = "0.1.0"
-trust-dns-resolver = { version = "0.20.3", path = "../resolver", default-features = false }
+trust-dns-resolver = { version = "0.20.4", path = "../resolver", default-features = false }
 
 [dev-dependencies]
 async-std = { version = "1.6", features = ["attributes"] }
-trust-dns-resolver = { version = "0.20.3", path = "../resolver", default-features = false, features = ["testing"] }
+trust-dns-resolver = { version = "0.20.4", path = "../resolver", default-features = false, features = ["testing"] }
diff --git a/crates/client/Cargo.toml b/crates/client/Cargo.toml
index 3f8385adaf..70f23b8f77 100644
--- a/crates/client/Cargo.toml
+++ b/crates/client/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "trust-dns-client"
-version = "0.20.3"
+version = "0.20.4"
 authors = ["Benjamin Fry <benjaminfry@me.com>"]
 edition = "2018"
 
@@ -81,8 +81,8 @@ serde = { version = "1.0", features = ["derive"], optional = true }
 thiserror = "1.0.20"
 time = "0.3"
 tokio = { version = "1.0", features = ["rt"] }
-trust-dns-https = { version = "0.20.3", path = "../https", optional = true }
-trust-dns-proto = { version = "0.20.3", path = "../proto", features = ["dnssec"]}
+trust-dns-https = { version = "0.20.4", path = "../https", optional = true }
+trust-dns-proto = { version = "0.20.4", path = "../proto", features = ["dnssec"]}
 webpki = { version = "0.21", optional = true }
 
 [dev-dependencies]
diff --git a/crates/https/Cargo.toml b/crates/https/Cargo.toml
index 36d8b2c793..b2cf0332e6 100644
--- a/crates/https/Cargo.toml
+++ b/crates/https/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "trust-dns-https"
-version = "0.20.3"
+version = "0.20.4"
 authors = ["Benjamin Fry <benjaminfry@me.com>"]
 edition = "2018"
 
@@ -59,8 +59,8 @@ thiserror = "1.0.20"
 tokio = { version = "1.0", features = ["io-util", "net", "rt"] }
 tokio-rustls = "0.22.0"
 # disables default features, i.e. openssl...
-trust-dns-proto = { version = "0.20.3", path = "../proto", features = ["tokio-runtime"], default-features = false }
-trust-dns-rustls = { version = "0.20.3", path = "../rustls", default-features = false }
+trust-dns-proto = { version = "0.20.4", path = "../proto", features = ["tokio-runtime"], default-features = false }
+trust-dns-rustls = { version = "0.20.4", path = "../rustls", default-features = false }
 webpki-roots = "0.21"
 webpki = "0.21"
 
diff --git a/crates/native-tls/Cargo.toml b/crates/native-tls/Cargo.toml
index 48bba8fbbd..7a8d8500dc 100644
--- a/crates/native-tls/Cargo.toml
+++ b/crates/native-tls/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "trust-dns-native-tls"
-version = "0.20.3"
+version = "0.20.4"
 authors = ["Benjamin Fry <benjaminfry@me.com>"]
 edition = "2018"
 
@@ -53,7 +53,7 @@ native-tls = "0.2"
 tokio = "1.0"
 tokio-native-tls = "0.3.0"
 # disables default features, i.e. openssl...
-trust-dns-proto = { version = "0.20.3", path = "../proto", features = ["tokio-runtime"], default-features = false }
+trust-dns-proto = { version = "0.20.4", path = "../proto", features = ["tokio-runtime"], default-features = false }
 
 [dev-dependencies]
 
diff --git a/crates/openssl/Cargo.toml b/crates/openssl/Cargo.toml
index 76b445caea..528e481126 100644
--- a/crates/openssl/Cargo.toml
+++ b/crates/openssl/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "trust-dns-openssl"
-version = "0.20.3"
+version = "0.20.4"
 authors = ["Benjamin Fry <benjaminfry@me.com>"]
 edition = "2018"
 
@@ -52,7 +52,7 @@ futures-util = { version = "0.3.5", default-features = false, features = ["std"]
 openssl = { version = "0.10", features = ["v102", "v110"] }
 tokio-openssl = "0.6.0"
 tokio = "1.0"
-trust-dns-proto = { version = "0.20.3", path = "../proto", features = ["openssl"] }
+trust-dns-proto = { version = "0.20.4", path = "../proto", features = ["openssl"] }
 
 [dev-dependencies]
 openssl = { version = "0.10", features = ["v102", "v110"] }
diff --git a/crates/proto/Cargo.toml b/crates/proto/Cargo.toml
index 3203ff325a..b8474b43ac 100644
--- a/crates/proto/Cargo.toml
+++ b/crates/proto/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "trust-dns-proto"
-version = "0.20.3"
+version = "0.20.4"
 edition = "2018"
 authors = ["Benjamin Fry <benjaminfry@me.com>"]
 
diff --git a/crates/resolver/Cargo.toml b/crates/resolver/Cargo.toml
index eb036868c9..249921cfc6 100644
--- a/crates/resolver/Cargo.toml
+++ b/crates/resolver/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "trust-dns-resolver"
-version = "0.20.3"
+version = "0.20.4"
 authors = ["Benjamin Fry <benjaminfry@me.com>"]
 edition = "2018"
 
@@ -81,11 +81,11 @@ tokio = { version = "1.0", optional = true }
 tokio-native-tls = { version = "0.3", optional = true }
 tokio-openssl = { version = "0.6.0", optional = true }
 tokio-rustls = { version = "0.22", optional = true }
-trust-dns-https = { version = "0.20.3", path = "../https", optional = true }
-trust-dns-native-tls = { version = "0.20.3", path = "../native-tls", optional = true }
-trust-dns-openssl = { version = "0.20.3", path = "../openssl", optional = true }
-trust-dns-proto = { version = "0.20.3", path = "../proto", default-features = false }
-trust-dns-rustls = { version = "0.20.3", path = "../rustls", optional = true }
+trust-dns-https = { version = "0.20.4", path = "../https", optional = true }
+trust-dns-native-tls = { version = "0.20.4", path = "../native-tls", optional = true }
+trust-dns-openssl = { version = "0.20.4", path = "../openssl", optional = true }
+trust-dns-proto = { version = "0.20.4", path = "../proto", default-features = false }
+trust-dns-rustls = { version = "0.20.4", path = "../rustls", optional = true }
 webpki-roots = { version = "0.21", optional = true }
 
 [target.'cfg(windows)'.dependencies]
diff --git a/crates/rustls/Cargo.toml b/crates/rustls/Cargo.toml
index b3230ca90d..81b695d65c 100644
--- a/crates/rustls/Cargo.toml
+++ b/crates/rustls/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "trust-dns-rustls"
-version = "0.20.3"
+version = "0.20.4"
 authors = ["Benjamin Fry <benjaminfry@me.com>"]
 edition = "2018"
 
@@ -55,7 +55,7 @@ rustls = "0.19"
 tokio = { version = "1.0", features = ["io-util", "net"] }
 tokio-rustls = { version = "0.22", features = ["early-data"] }
 # disables default features, i.e. openssl...
-trust-dns-proto = { version = "0.20.3", path = "../proto", features = ["tokio-runtime"], default-features = false }
+trust-dns-proto = { version = "0.20.4", path = "../proto", features = ["tokio-runtime"], default-features = false }
 webpki = "0.21"
 
 [dev-dependencies]
diff --git a/crates/server/Cargo.toml b/crates/server/Cargo.toml
index 718a73ea04..c94fdb55c5 100644
--- a/crates/server/Cargo.toml
+++ b/crates/server/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "trust-dns-server"
-version = "0.20.3"
+version = "0.20.4"
 authors = ["Benjamin Fry <benjaminfry@me.com>"]
 edition = "2018"
 
@@ -91,9 +91,9 @@ tokio = { version = "1.0", features = ["net"] }
 tokio-openssl = { version = "0.6.0", optional = true }
 tokio-rustls = { version = "0.22", optional = true }
 toml = "0.5"
-trust-dns-client= { version = "0.20.3", path = "../client" }
-trust-dns-https = { version = "0.20.3", path = "../https", optional = true }
-trust-dns-proto = { version = "0.20.3", path = "../proto" }
-trust-dns-openssl = { version = "0.20.3", path = "../openssl", optional = true }
-trust-dns-resolver = { version = "0.20.3", path = "../resolver", features = ["serde-config"], optional = true }
-trust-dns-rustls = { version = "0.20.3", path = "../rustls", optional = true }
+trust-dns-client= { version = "0.20.4", path = "../client" }
+trust-dns-https = { version = "0.20.4", path = "../https", optional = true }
+trust-dns-proto = { version = "0.20.4", path = "../proto" }
+trust-dns-openssl = { version = "0.20.4", path = "../openssl", optional = true }
+trust-dns-resolver = { version = "0.20.4", path = "../resolver", features = ["serde-config"], optional = true }
+trust-dns-rustls = { version = "0.20.4", path = "../rustls", optional = true }
diff --git a/tests/compatibility-tests/Cargo.toml b/tests/compatibility-tests/Cargo.toml
index 08170c4816..ab5c388707 100644
--- a/tests/compatibility-tests/Cargo.toml
+++ b/tests/compatibility-tests/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "trust-dns-compatibility"
-version = "0.20.3"
+version = "0.20.4"
 authors = ["Benjamin Fry <benjaminfry@me.com>"]
 edition = "2018"
 
@@ -52,4 +52,4 @@ futures = "0.3.5"
 openssl = { version = "0.10", features = ["v102", "v110"] }
 rand = "0.8"
 time = "0.3"
-trust-dns-client= { version = "0.20.3", path="../../crates/client", features = ["dnssec-openssl"] }
+trust-dns-client= { version = "0.20.4", path="../../crates/client", features = ["dnssec-openssl"] }
diff --git a/tests/integration-tests/Cargo.toml b/tests/integration-tests/Cargo.toml
index 49c82de887..8ed3ef3936 100644
--- a/tests/integration-tests/Cargo.toml
+++ b/tests/integration-tests/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "trust-dns-integration"
-version = "0.20.3"
+version = "0.20.4"
 authors = ["Benjamin Fry <benjaminfry@me.com>"]
 edition = "2018"
 
@@ -78,14 +78,14 @@ rusqlite = { version = "0.26.0", features = ["bundled"] }
 rustls = "0.19"
 time = "0.3"
 tokio = { version = "1.0", features = ["time", "rt"] }
-trust-dns-client= { version = "0.20.3", path = "../../crates/client" }
-trust-dns-https = { version = "0.20.3", path = "../../crates/https" }
-trust-dns-openssl = { version = "0.20.3", path = "../../crates/openssl" }
-trust-dns-proto = { version = "0.20.3", path = "../../crates/proto", features = ["testing"] }
-trust-dns-resolver = { version = "0.20.3", path = "../../crates/resolver" }
-trust-dns-rustls = { version = "0.20.3", path = "../../crates/rustls" }
+trust-dns-client= { version = "0.20.4", path = "../../crates/client" }
+trust-dns-https = { version = "0.20.4", path = "../../crates/https" }
+trust-dns-openssl = { version = "0.20.4", path = "../../crates/openssl" }
+trust-dns-proto = { version = "0.20.4", path = "../../crates/proto", features = ["testing"] }
+trust-dns-resolver = { version = "0.20.4", path = "../../crates/resolver" }
+trust-dns-rustls = { version = "0.20.4", path = "../../crates/rustls" }
 # TODO: fixup tests to not require openssl
-trust-dns-server = { version = "0.20.3", path = "../../crates/server" }
+trust-dns-server = { version = "0.20.4", path = "../../crates/server" }
 webpki-roots = { version = "0.21", optional = true }
 
 [dev-dependencies]
diff --git a/util/Cargo.toml b/util/Cargo.toml
index 953628600a..f14b3d026b 100644
--- a/util/Cargo.toml
+++ b/util/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "trust-dns-util"
-version = "0.20.3"
+version = "0.20.4"
 authors = ["Benjamin Fry <benjaminfry@me.com>"]
 edition = "2018"
 
@@ -59,9 +59,9 @@ clap = "2.33.1"
 console = "0.14.0"
 data-encoding = "2.2.0"
 env_logger = { version = "0.8.1", features = ["termcolor", "humantime", "atty"] }
-trust-dns-client= { version = "0.20.3", features = ["dnssec-openssl"], path = "../crates/client" }
-trust-dns-proto = { version = "0.20.3", features = ["dnssec-openssl"], path = "../crates/proto" }
-trust-dns-resolver = { version = "0.20.3", features = ["dnssec-openssl"], path = "../crates/resolver" }
+trust-dns-client= { version = "0.20.4", features = ["dnssec-openssl"], path = "../crates/client" }
+trust-dns-proto = { version = "0.20.4", features = ["dnssec-openssl"], path = "../crates/proto" }
+trust-dns-resolver = { version = "0.20.4", features = ["dnssec-openssl"], path = "../crates/resolver" }
 log = "0.4"
 openssl = { version = "0.10", features = ["v102", "v110"] }
 structopt = "0.3"