diff --git a/.gitignore b/.gitignore
index 7c776d8..d66e9db 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,4 @@ sqlelf.egg-info/
 *.pyc
 .vscode/
 dist/
+result
diff --git a/flake.nix b/flake.nix
index 8b7c127..13aec83 100644
--- a/flake.nix
+++ b/flake.nix
@@ -19,13 +19,14 @@
           inherit system;
           overlays = [ poetry2nix.overlay (import ./overlay.nix) ];
         };
-      in {
+      in
+      {
         packages = {
           sqlelf = pkgs.sqlelf;
           default = pkgs.sqlelf;
         };
 
         devShell = pkgs.sqlelf-env.env.overrideAttrs
-          (oldAttrs: { buildInputs = [ pkgs.poetry pkgs.sqlite ]; });
+          (oldAttrs: { buildInputs = with pkgs; [ poetry pyright nixpkgs-fmt ]; });
       });
 }
diff --git a/poetry.lock b/poetry.lock
index f4c168b..5a35566 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -323,6 +323,23 @@ files = [
     {file = "pyflakes-3.1.0.tar.gz", hash = "sha256:a0aae034c444db0071aa077972ba4768d40c830d9539fd45bf4cd3f8f6992efc"},
 ]
 
+[[package]]
+name = "setuptools"
+version = "68.1.2"
+description = "Easily download, build, install, upgrade, and uninstall Python packages"
+category = "main"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "setuptools-68.1.2-py3-none-any.whl", hash = "sha256:3d8083eed2d13afc9426f227b24fd1659489ec107c0e86cec2ffdde5c92e790b"},
+    {file = "setuptools-68.1.2.tar.gz", hash = "sha256:3d4dfa6d95f1b101d695a6160a7626e15583af71a5f52176efa5d39a054d475d"},
+]
+
+[package.extras]
+docs = ["furo", "jaraco.packaging (>=9.3)", "jaraco.tidelift (>=1.4)", "pygments-github-lexers (==0.0.5)", "rst.linker (>=1.9)", "sphinx (>=3.5,<=7.1.2)", "sphinx-favicon", "sphinx-hoverxref (<2)", "sphinx-inline-tabs", "sphinx-lint", "sphinx-notfound-page (==0.8.3)", "sphinx-reredirects", "sphinxcontrib-towncrier"]
+testing = ["build[virtualenv]", "filelock (>=3.4.0)", "flake8-2020", "ini2toml[lite] (>=0.9)", "jaraco.develop (>=7.21)", "jaraco.envs (>=2.2)", "jaraco.path (>=3.2.0)", "pip (>=19.1)", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=2.2)", "pytest-mypy (>=0.9.1)", "pytest-perf", "pytest-ruff", "pytest-timeout", "pytest-xdist", "tomli-w (>=1.0.0)", "virtualenv (>=13.0.0)", "wheel"]
+testing-integration = ["build[virtualenv]", "filelock (>=3.4.0)", "jaraco.envs (>=2.2)", "jaraco.path (>=3.2.0)", "pytest", "pytest-enabler", "pytest-xdist", "tomli", "virtualenv (>=13.0.0)", "wheel"]
+
 [[package]]
 name = "tomli"
 version = "2.0.1"
@@ -338,4 +355,4 @@ files = [
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.10"
-content-hash = "08e5f7b2b5bd712d005ab610be8b77f518cc02aa74b56e661d948e113aa93a7c"
+content-hash = "0871b2e72bc3a35e481b388aaccd898b4225a2f5ab3368770188a2411cfab7de"
diff --git a/pyproject.toml b/pyproject.toml
index a3c32f9..ceb8ad3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,6 +11,11 @@ python = ">=3.10"
 capstone = "^5.0.1"
 lief = "^0.13.2"
 apsw = "^3.43.0.0"
+# TODO(fzakaria): Would love to specify this as an exact version
+# but I was getting weird failures with `nix build`
+# ERROR: Could not find a version that satisfies the requirement setuptools<61.0.0,>=60.0.0 (from sqlelf) (from versions: none)
+# ERROR: No matching distribution found for setuptools<61.0.0,>=60.0.0
+setuptools = "*"
 
 [tool.poetry.group.dev.dependencies]
 black = "^23.7.0"
@@ -28,10 +33,6 @@ sqlelf = "sqlelf.cli:start"
 skip = [".git", "result"]
 profile = "black"
 
-[tool.flake8]
-extend-ignore = "E203"
-max-line-length = 88
-
 [tool.pytest.ini_options]
 addopts = ""
 
diff --git a/setup.cfg b/setup.cfg
new file mode 100644
index 0000000..213eb8d
--- /dev/null
+++ b/setup.cfg
@@ -0,0 +1,3 @@
+[flake8]
+extend-ignore = E203
+max-line-length = 88
\ No newline at end of file
diff --git a/sqlelf/cli.py b/sqlelf/cli.py
index 461a0d0..55409f5 100644
--- a/sqlelf/cli.py
+++ b/sqlelf/cli.py
@@ -26,7 +26,7 @@ def start():
     args = parser.parse_args()
 
     # Iterate through our arguments and if one of them is a directory explode it out
-    filenames = reduce(
+    filenames: list[str] = reduce(
         lambda a, b: a + b,
         map(
             lambda dir: [os.path.join(dir, f) for f in os.listdir(dir)]