diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f08178b..c8571d0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,7 @@ jobs:
           - stable
           - beta
           - nightly
-          - 1.39.0
+          - 1.51.0
         features:
           - default
           - file_locks
diff --git a/Cargo.lock b/Cargo.lock
index 2449ce4..4d5f5b0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4,9 +4,9 @@ version = 3
 
 [[package]]
 name = "actix-macros"
-version = "0.1.3"
+version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b4ca8ce00b267af8ccebbd647de0d61e0674b6e61185cc7a592ff88772bed655"
+checksum = "465a6172cf69b960917811022d8f29bc0b7fa1398bc4f78b3c466673db1213b6"
 dependencies = [
  "quote",
  "syn",
@@ -14,34 +14,15 @@ dependencies = [
 
 [[package]]
 name = "actix-rt"
-version = "1.1.1"
+version = "2.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "143fcc2912e0d1de2bcf4e2f720d2a60c28652ab4179685a1ee159e0fb3db227"
+checksum = "7ea16c295198e958ef31930a6ef37d0fb64e9ca3b6116e6b93a8bdae96ee1000"
 dependencies = [
  "actix-macros",
- "actix-threadpool",
- "copyless",
- "futures-channel",
- "futures-util",
- "smallvec",
+ "futures-core",
  "tokio",
 ]
 
-[[package]]
-name = "actix-threadpool"
-version = "0.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d209f04d002854b9afd3743032a27b066158817965bf5d036824d19ac2cc0e30"
-dependencies = [
- "derive_more",
- "futures-channel",
- "lazy_static",
- "log",
- "num_cpus",
- "parking_lot",
- "threadpool",
-]
-
 [[package]]
 name = "aho-corasick"
 version = "0.7.13"
@@ -59,7 +40,7 @@ checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
 dependencies = [
  "hermit-abi",
  "libc",
- "winapi 0.3.9",
+ "winapi",
 ]
 
 [[package]]
@@ -68,12 +49,6 @@ version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
 
-[[package]]
-name = "bytes"
-version = "0.5.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0e4cec68f03f32e44924783795810fa50a7035d8c8ebe78580ad7e6c703fba38"
-
 [[package]]
 name = "cfg-if"
 version = "0.1.10"
@@ -86,30 +61,6 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
-[[package]]
-name = "convert_case"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6245d59a3e82a7fc217c5828a6692dbc6dfb63a0c8c90495621f7b9d79704a0e"
-
-[[package]]
-name = "copyless"
-version = "0.1.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a2df960f5d869b2dd8532793fde43eb5427cceb126c929747a26823ab0eeb536"
-
-[[package]]
-name = "derive_more"
-version = "0.99.13"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f82b1b72f1263f214c0f823371768776c4f5841b942c9883aa8e5ec584fd0ba6"
-dependencies = [
- "convert_case",
- "proc-macro2",
- "quote",
- "syn",
-]
-
 [[package]]
 name = "document-features"
 version = "0.2.1"
@@ -124,9 +75,9 @@ checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
 
 [[package]]
 name = "env_logger"
-version = "0.7.1"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "44533bbbb3bb3c1fa17d9f2e4e38bbbaf8396ba82193c4cb1b6445d711445d36"
+checksum = "0b2cf0344971ee6c64c31be0d530793fba457d322dfec2810c453d0ef228f9c3"
 dependencies = [
  "atty",
  "humantime",
@@ -142,32 +93,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "31bbcaaf785e09a604b93b15b9ccb41cbf4716fa04c788748d157cb3134d717b"
 dependencies = [
  "libc",
- "winapi 0.3.9",
-]
-
-[[package]]
-name = "fuchsia-zircon"
-version = "0.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2e9763c69ebaae630ba35f74888db465e49e259ba1bc0eda7d06f4a067615d82"
-dependencies = [
- "bitflags",
- "fuchsia-zircon-sys",
-]
-
-[[package]]
-name = "fuchsia-zircon-sys"
-version = "0.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3dcaa9ae7725d12cdb85b3ad99a434db70b468c09ded17e012d86b5c1010f7a7"
-
-[[package]]
-name = "futures-channel"
-version = "0.3.15"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e682a68b29a882df0545c143dc3646daefe80ba479bcdede94d5a703de2871e2"
-dependencies = [
- "futures-core",
+ "winapi",
 ]
 
 [[package]]
@@ -190,7 +116,7 @@ checksum = "3c144ad54d60f23927f0a6b6d816e4271278b64f005ad65e4e35291d2de9c025"
 dependencies = [
  "futures-core",
  "futures-task",
- "pin-project-lite 0.2.6",
+ "pin-project-lite",
  "pin-utils",
 ]
 
@@ -211,30 +137,9 @@ dependencies = [
 
 [[package]]
 name = "humantime"
-version = "1.3.0"
+version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "df004cfca50ef23c36850aaaa59ad52cc70d0e90243c3c7737a4dd32dc7a3c4f"
-dependencies = [
- "quick-error",
-]
-
-[[package]]
-name = "instant"
-version = "0.1.12"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7a5bbe824c507c5da5956355e86a746d82e0e1464f65d862cc5e71da70e94b2c"
-dependencies = [
- "cfg-if 1.0.0",
-]
-
-[[package]]
-name = "iovec"
-version = "0.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b2b3ea6ff95e175473f8ffe6a7eb7c00d054240321b84c57051175fe3c1e075e"
-dependencies = [
- "libc",
-]
+checksum = "9a3a5bfb195931eeb336b2a7b4d761daec841b97f947d34394601737a7bba5e4"
 
 [[package]]
 name = "itertools"
@@ -251,16 +156,6 @@ version = "0.4.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b71991ff56294aa922b450139ee08b3bfc70982c6b2c7562771375cf73542dd4"
 
-[[package]]
-name = "kernel32-sys"
-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
-dependencies = [
- "winapi 0.2.8",
- "winapi-build",
-]
-
 [[package]]
 name = "lazy_static"
 version = "1.4.0"
@@ -299,98 +194,65 @@ checksum = "3728d817d99e5ac407411fa471ff9800a778d88a24685968b36824eaf4bee400"
 
 [[package]]
 name = "mio"
-version = "0.6.23"
+version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4afd66f5b91bf2a3bc13fad0e21caedac168ca4c707504e75585648ae80e4cc4"
+checksum = "52da4364ffb0e4fe33a9841a98a3f3014fb964045ce4f7a45a398243c8d6b0c9"
 dependencies = [
- "cfg-if 0.1.10",
- "fuchsia-zircon",
- "fuchsia-zircon-sys",
- "iovec",
- "kernel32-sys",
  "libc",
  "log",
  "miow",
- "net2",
- "slab",
- "winapi 0.2.8",
-]
-
-[[package]]
-name = "mio-uds"
-version = "0.6.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "afcb699eb26d4332647cc848492bbc15eafb26f08d0304550d5aa1f612e066f0"
-dependencies = [
- "iovec",
- "libc",
- "mio",
+ "ntapi",
+ "wasi",
+ "winapi",
 ]
 
 [[package]]
 name = "miow"
-version = "0.2.2"
+version = "0.3.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ebd808424166322d4a38da87083bfddd3ac4c131334ed55856112eb06d46944d"
+checksum = "b9f1c5b025cda876f66ef43a113f91ebc9f4ccef34843000e0adf6ebbab84e21"
 dependencies = [
- "kernel32-sys",
- "net2",
- "winapi 0.2.8",
- "ws2_32-sys",
+ "winapi",
 ]
 
 [[package]]
-name = "net2"
-version = "0.2.37"
+name = "ntapi"
+version = "0.3.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "391630d12b68002ae1e25e8f974306474966550ad82dac6886fb8910c19568ae"
+checksum = "c28774a7fd2fbb4f0babd8237ce554b73af68021b5f695a3cebd6c59bac0980f"
 dependencies = [
- "cfg-if 0.1.10",
- "libc",
- "winapi 0.3.9",
+ "winapi",
 ]
 
 [[package]]
-name = "num_cpus"
-version = "1.13.0"
+name = "once_cell"
+version = "1.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "05499f3756671c15885fee9034446956fff3f243d6077b91e5767df161f766b3"
-dependencies = [
- "hermit-abi",
- "libc",
-]
+checksum = "87f3e037eac156d1775da914196f0f37741a274155e34a0b7e427c35d2a2ecb9"
 
 [[package]]
 name = "parking_lot"
-version = "0.11.2"
+version = "0.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7d17b78036a60663b797adeaee46f5c9dfebb86948d1255007a1d6be0271ff99"
+checksum = "87f5ec2493a61ac0506c0f4199f99070cbe83857b0337006a30f3e6719b8ef58"
 dependencies = [
- "instant",
  "lock_api",
  "parking_lot_core",
 ]
 
 [[package]]
 name = "parking_lot_core"
-version = "0.8.5"
+version = "0.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d76e8e1493bcac0d2766c42737f34458f1c8c50c0d23bcb24ea953affb273216"
+checksum = "28141e0cc4143da2443301914478dc976a61ffdb3f043058310c70df2fed8954"
 dependencies = [
  "cfg-if 1.0.0",
- "instant",
  "libc",
  "redox_syscall",
  "smallvec",
- "winapi 0.3.9",
+ "windows-sys",
 ]
 
-[[package]]
-name = "pin-project-lite"
-version = "0.1.10"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e555d9e657502182ac97b539fb3dae8b79cda19e3e4f8ffb5e8de4f18df93c95"
-
 [[package]]
 name = "pin-project-lite"
 version = "0.2.6"
@@ -436,12 +298,6 @@ dependencies = [
  "unicode-xid",
 ]
 
-[[package]]
-name = "quick-error"
-version = "1.2.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a1d01941d82fa2ab50be1e79e6714289dd7cde78eba4c074bc5a4374f650dfe0"
-
 [[package]]
 name = "quote"
 version = "1.0.7"
@@ -529,7 +385,7 @@ dependencies = [
 
 [[package]]
 name = "serial_test"
-version = "0.6.0"
+version = "0.7.0"
 dependencies = [
  "document-features",
  "fslock",
@@ -541,7 +397,7 @@ dependencies = [
 
 [[package]]
 name = "serial_test_derive"
-version = "0.6.0"
+version = "0.7.0"
 dependencies = [
  "env_logger",
  "proc-macro-error",
@@ -554,7 +410,7 @@ dependencies = [
 
 [[package]]
 name = "serial_test_test"
-version = "0.6.0"
+version = "0.7.0"
 dependencies = [
  "actix-rt",
  "env_logger",
@@ -573,18 +429,22 @@ dependencies = [
  "libc",
 ]
 
-[[package]]
-name = "slab"
-version = "0.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f173ac3d1a7e3b28003f40de0b5ce7fe2710f9b9dc3fc38664cebee46b3b6527"
-
 [[package]]
 name = "smallvec"
 version = "1.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f2dd574626839106c320a323308629dcb1acfc96e32a8cba364ddc61ac23ee83"
 
+[[package]]
+name = "socket2"
+version = "0.4.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "66d72b759436ae32898a2af0a14218dbf55efde3feeb170eb623637db85ee1e0"
+dependencies = [
+ "libc",
+ "winapi",
+]
+
 [[package]]
 name = "syn"
 version = "1.0.67"
@@ -614,41 +474,28 @@ dependencies = [
  "lazy_static",
 ]
 
-[[package]]
-name = "threadpool"
-version = "1.8.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d050e60b33d41c19108b32cea32164033a9013fe3b46cbd4457559bfbf77afaa"
-dependencies = [
- "num_cpus",
-]
-
 [[package]]
 name = "tokio"
-version = "0.2.22"
+version = "1.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5d34ca54d84bf2b5b4d7d31e901a8464f7b60ac145a284fba25ceb801f2ddccd"
+checksum = "2af73ac49756f3f7c01172e34a23e5d0216f6c32333757c2c61feb2bbff5a5ee"
 dependencies = [
- "bytes",
- "futures-core",
- "iovec",
- "lazy_static",
  "libc",
  "mio",
- "mio-uds",
- "num_cpus",
- "pin-project-lite 0.1.10",
+ "once_cell",
+ "parking_lot",
+ "pin-project-lite",
  "signal-hook-registry",
- "slab",
+ "socket2",
  "tokio-macros",
- "winapi 0.3.9",
+ "winapi",
 ]
 
 [[package]]
 name = "tokio-macros"
-version = "0.2.5"
+version = "1.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f0c3acc6aa564495a0f2e1d59fab677cd7f81a19994cfc7f3ad0e64301560389"
+checksum = "b557f72f448c511a979e2564e55d74e6c4432fc96ff4f6241bc6bded342643b7"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -691,10 +538,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5fecdca9a5291cc2b8dcf7dc02453fee791a280f3743cb0905f8822ae463b3fe"
 
 [[package]]
-name = "winapi"
-version = "0.2.8"
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
 
 [[package]]
 name = "winapi"
@@ -706,12 +553,6 @@ dependencies = [
  "winapi-x86_64-pc-windows-gnu",
 ]
 
-[[package]]
-name = "winapi-build"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
-
 [[package]]
 name = "winapi-i686-pc-windows-gnu"
 version = "0.4.0"
@@ -724,7 +565,7 @@ version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
 dependencies = [
- "winapi 0.3.9",
+ "winapi",
 ]
 
 [[package]]
@@ -734,11 +575,44 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 
 [[package]]
-name = "ws2_32-sys"
-version = "0.2.1"
+name = "windows-sys"
+version = "0.32.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
+checksum = "3df6e476185f92a12c072be4a189a0210dcdcf512a1891d6dff9edb874deadc6"
 dependencies = [
- "winapi 0.2.8",
- "winapi-build",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_msvc",
 ]
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.32.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d8e92753b1c443191654ec532f14c199742964a061be25d77d7a96f09db20bf5"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.32.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a711c68811799e017b6038e0922cb27a5e2f43a2ddb609fe0b6f3eeda9de615"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.32.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "146c11bb1a02615db74680b32a68e2d61f553cc24c4eb5b4ca10311740e44172"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.32.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c912b12f7454c6620635bbff3450962753834be2a594819bd5e945af18ec64bc"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.32.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "504a2476202769977a040c6364301a3f65d0cc9e3fb08600b2bda150a0488316"
diff --git a/README.md b/README.md
index edb8d01..ce7a35d 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 [![Docs](https://docs.rs/serial_test/badge.svg)](https://docs.rs/serial_test/)
 [![MIT license](https://img.shields.io/crates/l/serial_test.svg)](./LICENSE)
 [![Build Status](https://github.com/palfrey/serial_test/workflows/Continuous%20integration/badge.svg?branch=main)](https://github.com/palfrey/serial_test/actions)
-[![MSRV: 1.39.0](https://flat.badgen.net/badge/MSRV/1.39.0/purple)](https://blog.rust-lang.org/2019/11/07/Rust-1.39.0.html)
+[![MSRV: 1.51.0](https://flat.badgen.net/badge/MSRV/1.51.0/purple)](https://blog.rust-lang.org/2021/03/25/Rust-1.51.0.html)
 
 `serial_test` allows for the creation of serialised Rust tests using the `serial` attribute
 e.g.
@@ -37,7 +37,7 @@ similar properties but based off file locking. Note that there are no guarantees
 `file_serial` as they lock using different methods.
 
 ## Usage
-We require at least Rust 1.39 for [async/await](https://blog.rust-lang.org/2019/11/07/Async-await-stable.html) support
+We require at least Rust 1.51. Upgrades to this will require at least a minor version bump (while in 0.x versions) and a major version bump post-1.0.
 
 Add to your Cargo.toml
 ```toml
diff --git a/serial_test/Cargo.toml b/serial_test/Cargo.toml
index 6c35c38..e29b18d 100644
--- a/serial_test/Cargo.toml
+++ b/serial_test/Cargo.toml
@@ -2,7 +2,7 @@
 name = "serial_test"
 description = "Allows for the creation of serialised Rust tests"
 license = "MIT"
-version = "0.6.0"
+version = "0.7.0"
 authors = ["Tom Parker-Shemilt <palfrey@tevp.net>"]
 edition = "2018"
 repository = "https://github.com/palfrey/serial_test/"
@@ -12,8 +12,8 @@ keywords = ["sequential"]
 
 [dependencies]
 lazy_static = "1.2"
-parking_lot = ">= 0.10, < 0.12" # Can't upgrade or we break 1.39
-serial_test_derive = { version = "~0.6.0", path = "../serial_test_derive" }
+parking_lot = "^0.12"
+serial_test_derive = { version = "~0.7.0", path = "../serial_test_derive" }
 fslock = {version = "0.2", optional = true}
 document-features = {version = "0.2", optional=true}
 
diff --git a/serial_test_derive/Cargo.toml b/serial_test_derive/Cargo.toml
index e32f5d3..e86a4fa 100644
--- a/serial_test_derive/Cargo.toml
+++ b/serial_test_derive/Cargo.toml
@@ -2,7 +2,7 @@
 name = "serial_test_derive"
 description = "Helper crate for serial_test"
 license = "MIT"
-version = "0.6.0"
+version = "0.7.0"
 authors = ["Tom Parker-Shemilt <palfrey@tevp.net>"]
 edition = "2018"
 readme = "README.md"
@@ -20,5 +20,5 @@ proc-macro-error = { version = "1" }
 rustversion = "1.0"
 
 [dev-dependencies]
-env_logger = ">= 0.7, <0.9"
+env_logger = "0.9"
 trybuild = "1"
\ No newline at end of file
diff --git a/serial_test_test/Cargo.toml b/serial_test_test/Cargo.toml
index ad5925a..f9c3b92 100644
--- a/serial_test_test/Cargo.toml
+++ b/serial_test_test/Cargo.toml
@@ -2,21 +2,19 @@
 name = "serial_test_test"
 description = "External testing crate for serial_test"
 license = "MIT"
-version = "0.6.0"
+version = "0.7.0"
 authors = ["Tom Parker-Shemilt <palfrey@tevp.net>"]
 edition = "2018"
 
 [dependencies]
 serial_test = { path="../serial_test" }
 lazy_static = "^1.2"
-env_logger = ">= 0.7, <0.9"
+env_logger = "^0.9"
 
 [dev-dependencies]
-tokio = { version = "0.2", features = ["macros", "rt-threaded"] } # Can't upgrade or we break 1.39
-actix-rt = { version = "1.0", default_features = false }
-
-# futures 0.3.15 breaks 1.39
-futures-util = {version = ">=0.3, <0.3.15", default_features = false }
+tokio = { version = "^1.17", features = ["macros", "rt"] }
+actix-rt = { version = "^2.7", features = ["macros"] }
+futures-util = {version = "^0.3", default_features = false }
 
 [features]
 default = []