diff --git a/overrides/default.nix b/overrides/default.nix
index d621db7..7e4c2e4 100644
--- a/overrides/default.nix
+++ b/overrides/default.nix
@@ -2285,6 +2285,43 @@ lib.composeManyExtensions [
         }).wheel;
       };
 
+      watchfiles =
+        let
+          # Watchfiles does not include Cargo.lock in tarball released on PyPi for versions up to 0.17.0
+          getRepoHash = version: {
+            "0.17.0" = "1swpf265h9qq30cx55iy6jjirba3wml16wzb68k527ynrxr7hvqx";
+            "0.16.1" = "1ss6gzcr6js2d2sddgz1p52gyiwpqmgrxm8r6wim7gnm4wvhav8a";
+            "0.15.0" = "14k3avrj7v794kk4mk2xggn40a4s0zg8iq8wmyyyrf7va6hz29hf";
+            "0.14.1" = "1pgfbhxrvr3dw46x9piqj3ydxgn4lkrfp931q0cajinrpv4acfay";
+            "0.14" = "0lml67ilyly0i632pffdy1gd07404vx90xnkw8q6wf6xp5afmkka";
+            "0.13" = "0rkz8yr01mmxm2lcmbnr9i5c7n371mksij7v3ws0aqlrh3kgww02";
+            "0.12" = "16788a0d8n1bb705f0k3dvav2fmbbl6pcikwpgarl1l3fcfff8kl";
+            "0.11" = "0vx56h9wfxj7x3aq7jign4rnlfm7x9nhjwmsv8p22acbzbs10dgv";
+            "0.10" = "0ypdy9sq4211djqh4ni5ap9l7whq9hw0vhsxjfl3a0a4czlldxqp";
+          }.${version};
+          sha256 = getRepoHash super.watchfiles.version;
+        in
+        super.watchfiles.overridePythonAttrs (old: rec {
+          src = pkgs.fetchFromGitHub {
+            owner = "samuelcolvin";
+            repo = "watchfiles";
+            rev = "v${old.version}";
+            inherit sha256;
+          };
+          cargoDeps = pkgs.rustPlatform.importCargoLock {
+            lockFile = "${src.out}/Cargo.lock";
+          };
+          buildInputs = (old.buildInputs or [ ]) ++ lib.optionals stdenv.isDarwin [
+            pkgs.darwin.apple_sdk.frameworks.Security
+            pkgs.darwin.apple_sdk.frameworks.CoreServices
+            pkgs.libiconv
+          ];
+          nativeBuildInputs = (old.nativeBuildInputs or [ ]) ++ [
+            pkgs.rustPlatform.cargoSetupHook
+            pkgs.rustPlatform.maturinBuildHook
+          ];
+        });
+
       weasyprint = super.weasyprint.overridePythonAttrs (
         old: {
           inherit (pkgs.python3.pkgs.weasyprint) patches;
diff --git a/tests/default.nix b/tests/default.nix
index 021a1dc..f78d3c6 100644
--- a/tests/default.nix
+++ b/tests/default.nix
@@ -86,6 +86,7 @@ builtins.removeAttrs
   aiopath = callTest ./aiopath { };
   fetched-projectdir = callTest ./fetched-projectdir { };
   assorted-pkgs = callTest ./assorted-pkgs { };
+  watchfiles = callTest ./watchfiles { };
 
   # Cross tests fail on darwin for some strange reason:
   # ERROR: MarkupSafe-2.0.1-cp39-cp39-linux_aarch64.whl is not a supported wheel on this platform.
diff --git a/tests/watchfiles/default.nix b/tests/watchfiles/default.nix
new file mode 100644
index 0000000..7172cd7
--- /dev/null
+++ b/tests/watchfiles/default.nix
@@ -0,0 +1,13 @@
+{ lib, poetry2nix, python3, runCommand }:
+let
+  env = poetry2nix.mkPoetryEnv {
+    python = python3;
+    pyproject = ./pyproject.toml;
+    poetrylock = ./poetry.lock;
+  };
+in
+runCommand "watchfiles-test"
+{ } ''
+  ${env}/bin/python -c 'from watchfiles import watch'
+  touch $out
+''
diff --git a/tests/watchfiles/poetry.lock b/tests/watchfiles/poetry.lock
new file mode 100644
index 0000000..c2ccf16
--- /dev/null
+++ b/tests/watchfiles/poetry.lock
@@ -0,0 +1,82 @@
+[[package]]
+name = "anyio"
+version = "3.6.1"
+description = "High level compatibility layer for multiple asynchronous event loop implementations"
+category = "main"
+optional = false
+python-versions = ">=3.6.2"
+
+[package.dependencies]
+idna = ">=2.8"
+sniffio = ">=1.1"
+
+[package.extras]
+doc = ["packaging", "sphinx-rtd-theme", "sphinx-autodoc-typehints (>=1.2.0)"]
+test = ["coverage[toml] (>=4.5)", "hypothesis (>=4.0)", "pytest (>=7.0)", "pytest-mock (>=3.6.1)", "trustme", "contextlib2", "uvloop (<0.15)", "mock (>=4)", "uvloop (>=0.15)"]
+trio = ["trio (>=0.16)"]
+
+[[package]]
+name = "idna"
+version = "3.4"
+description = "Internationalized Domain Names in Applications (IDNA)"
+category = "main"
+optional = false
+python-versions = ">=3.5"
+
+[[package]]
+name = "sniffio"
+version = "1.3.0"
+description = "Sniff out which async library your code is running under"
+category = "main"
+optional = false
+python-versions = ">=3.7"
+
+[[package]]
+name = "watchfiles"
+version = "0.17.0"
+description = "Simple, modern and high performance file watching and code reload in python."
+category = "main"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+anyio = ">=3.0.0,<4"
+
+[metadata]
+lock-version = "1.1"
+python-versions = "^3.9"
+content-hash = "778f3eb8172aaf41213f2ccd46e1298fad9112463b9670d7f9e9e02f210bf787"
+
+[metadata.files]
+anyio = [
+    {file = "anyio-3.6.1-py3-none-any.whl", hash = "sha256:cb29b9c70620506a9a8f87a309591713446953302d7d995344d0d7c6c0c9a7be"},
+    {file = "anyio-3.6.1.tar.gz", hash = "sha256:413adf95f93886e442aea925f3ee43baa5a765a64a0f52c6081894f9992fdd0b"},
+]
+idna = [
+    {file = "idna-3.4-py3-none-any.whl", hash = "sha256:90b77e79eaa3eba6de819a0c442c0b4ceefc341a7a2ab77d7562bf49f425c5c2"},
+    {file = "idna-3.4.tar.gz", hash = "sha256:814f528e8dead7d329833b91c5faa87d60bf71824cd12a7530b5526063d02cb4"},
+]
+sniffio = [
+    {file = "sniffio-1.3.0-py3-none-any.whl", hash = "sha256:eecefdce1e5bbfb7ad2eeaabf7c1eeb404d7757c379bd1f7e5cce9d8bf425384"},
+    {file = "sniffio-1.3.0.tar.gz", hash = "sha256:e60305c5e5d314f5389259b7f22aaa33d8f7dee49763119234af3755c55b9101"},
+]
+watchfiles = [
+    {file = "watchfiles-0.17.0-cp37-abi3-macosx_10_7_x86_64.whl", hash = "sha256:c7e1ffbd03cbcb46d1b7833e10e7d6b678ab083b4e4b80db06cfff5baca3c93f"},
+    {file = "watchfiles-0.17.0-cp37-abi3-macosx_11_0_arm64.whl", hash = "sha256:539bcdb55a487126776c9d8c011094214d1df3f9a2321a6c0b1583197309405a"},
+    {file = "watchfiles-0.17.0-cp37-abi3-manylinux_2_12_i686.manylinux2010_i686.whl", hash = "sha256:00e5f307a58752ec1478eeb738863544bde21cc7a2728bd1c216060406bde9c1"},
+    {file = "watchfiles-0.17.0-cp37-abi3-manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:92675f379a9d5adbc6a52179f3e39aa56944c6eecb80384608fff2ed2619103a"},
+    {file = "watchfiles-0.17.0-cp37-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:1dd1e3181ad5d83ca35e9147c72e24f39437fcdf570c9cdc532016399fb62957"},
+    {file = "watchfiles-0.17.0-cp37-abi3-manylinux_2_17_armv7l.manylinux2014_armv7l.whl", hash = "sha256:204950f1d6083539af5c8b7d4f5f8039c3ce36fa692da12d9743448f3199cb15"},
+    {file = "watchfiles-0.17.0-cp37-abi3-musllinux_1_1_aarch64.whl", hash = "sha256:4056398d8f6d4972fe0918707b59d4cb84470c91d3c37f0e11e5a66c2a598760"},
+    {file = "watchfiles-0.17.0-cp37-abi3-musllinux_1_1_x86_64.whl", hash = "sha256:ffff3418dc753a2aed2d00200a4daeaac295c40458f8012836a65555f288be8b"},
+    {file = "watchfiles-0.17.0-cp37-abi3-win32.whl", hash = "sha256:b5c334cd3bc88aa4a8a1e08ec9f702b63c947211275defdc2dd79dc037fcb500"},
+    {file = "watchfiles-0.17.0-cp37-abi3-win_amd64.whl", hash = "sha256:53a2faeb121bc51bb6b960984f46901227e2e2475acc5a8d4c905a600436752d"},
+    {file = "watchfiles-0.17.0-cp37-abi3-win_arm64.whl", hash = "sha256:58dc3140dcf02a8aa76464a77a093016f10e89306fec21a4814922a64f3e8b9f"},
+    {file = "watchfiles-0.17.0-pp38-pypy38_pp73-macosx_10_7_x86_64.whl", hash = "sha256:adcf15ecc2182ea9d2358c1a8c2b53203c3909484918776929b7bbe205522c0e"},
+    {file = "watchfiles-0.17.0-pp38-pypy38_pp73-manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:afd35a1bd3b9e68efe384ae7538481ae725597feb66f56f4bd23ecdbda726da0"},
+    {file = "watchfiles-0.17.0-pp38-pypy38_pp73-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:ad2bdcae4c0f07ca6c090f5a2c30188cc6edba011b45e7c96eb1896648092367"},
+    {file = "watchfiles-0.17.0-pp39-pypy39_pp73-macosx_10_7_x86_64.whl", hash = "sha256:a53cb6c06e5c1f216c792fbb432ce315239d432cb8b68d508547100939ec0399"},
+    {file = "watchfiles-0.17.0-pp39-pypy39_pp73-manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:6a3d6c699f3ce238dfa90bcef501f331a69b0d9b076f14459ed8eab26ba2f4cf"},
+    {file = "watchfiles-0.17.0-pp39-pypy39_pp73-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:a7f4271af86569bdbf131dd5c7c121c45d0ed194f3c88b88326e48a3b6a2db12"},
+    {file = "watchfiles-0.17.0.tar.gz", hash = "sha256:ae7c57ef920589a40270d5ef3216d693f4e6f8864d8fc8b6cb7885ca98ad2a61"},
+]
diff --git a/tests/watchfiles/pyproject.toml b/tests/watchfiles/pyproject.toml
new file mode 100644
index 0000000..a736e18
--- /dev/null
+++ b/tests/watchfiles/pyproject.toml
@@ -0,0 +1,15 @@
+[tool.poetry]
+name = "test-watchfiles"
+version = "0.1.0"
+description = ""
+authors = []
+
+[tool.poetry.dependencies]
+python = "^3.9"
+watchfiles = "0.17.0"
+
+[tool.poetry.dev-dependencies]
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"