diff --git a/docs/src/api/builtins/test.md b/docs/src/api/builtins/test.md
index a62c0cc1..30092084 100644
--- a/docs/src/api/builtins/test.md
+++ b/docs/src/api/builtins/test.md
@@ -164,10 +164,7 @@ Example:
     ```nix
     {
       testPython = {
-        example = {
-          python = "3.9";
-          src = "/test/test-python";
-        };
+        example.src = "/test/test-python";
       };
     }
     ```
diff --git a/makes.nix b/makes.nix
index cf908a73..42a67d9b 100644
--- a/makes.nix
+++ b/makes.nix
@@ -252,11 +252,9 @@
   };
   testPython = {
     example = {
-      python = "3.12";
       src = "/test/test-python";
     };
     cliMain = {
-      python = "3.10";
       extraFlags = [
         "--cov=main"
         "--cov-branch"
diff --git a/src/args/test-python/default.nix b/src/args/test-python/default.nix
index 3d5c3f9f..d7eb9a25 100644
--- a/src/args/test-python/default.nix
+++ b/src/args/test-python/default.nix
@@ -1,5 +1,5 @@
 {
-  makePythonPypiEnvironment,
+  makePythonEnvironment,
   makeSearchPaths,
   makeScript,
   toBashArray,
@@ -10,32 +10,25 @@
   extraSrcs,
   name,
   project,
-  python,
   searchPaths,
   src,
-}: let
-  pythonPypiEnvironment = makePythonPypiEnvironment {
-    inherit name;
-    sourcesYaml =
-      {
-        "3.9" = ./pypi-sources-3.9.yaml;
-        "3.10" = ./pypi-sources-3.10.yaml;
-        "3.11" = ./pypi-sources-3.11.yaml;
-        "3.12" = ./pypi-sources-3.12.yaml;
-      }
-      .${python};
+}:
+makeScript {
+  name = "test-python-for-${name}";
+  replace = {
+    __argExtraFlags__ = toBashArray extraFlags;
+    __argExtraSrcs__ = toBashMap extraSrcs;
+    __argProject__ = project;
+    __argSrc__ = src;
   };
-in
-  makeScript {
-    name = "test-python-for-${name}";
-    replace = {
-      __argExtraFlags__ = toBashArray extraFlags;
-      __argExtraSrcs__ = toBashMap extraSrcs;
-      __argProject__ = project;
-      __argSrc__ = src;
-    };
-    entrypoint = ./entrypoint.sh;
-    searchPaths = {
-      source = [pythonPypiEnvironment (makeSearchPaths searchPaths)];
-    };
-  }
+  entrypoint = ./entrypoint.sh;
+  searchPaths = {
+    source = [
+      (makePythonEnvironment {
+        pythonProjectDir = ./.;
+        pythonVersion = "3.11";
+      })
+      (makeSearchPaths searchPaths)
+    ];
+  };
+}
diff --git a/src/args/test-python/poetry.lock b/src/args/test-python/poetry.lock
new file mode 100644
index 00000000..431026ea
--- /dev/null
+++ b/src/args/test-python/poetry.lock
@@ -0,0 +1,94 @@
+# This file is automatically @generated by Poetry 1.7.1 and should not be changed by hand.
+
+[[package]]
+name = "attrs"
+version = "23.2.0"
+description = "Classes Without Boilerplate"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "attrs-23.2.0-py3-none-any.whl", hash = "sha256:99b87a485a5820b23b879f04c2305b44b951b502fd64be915879d77a7e8fc6f1"},
+    {file = "attrs-23.2.0.tar.gz", hash = "sha256:935dc3b529c262f6cf76e50877d35a4bd3c1de194fd41f47a2b7ae8f19971f30"},
+]
+
+[package.extras]
+cov = ["attrs[tests]", "coverage[toml] (>=5.3)"]
+dev = ["attrs[tests]", "pre-commit"]
+docs = ["furo", "myst-parser", "sphinx", "sphinx-notfound-page", "sphinxcontrib-towncrier", "towncrier", "zope-interface"]
+tests = ["attrs[tests-no-zope]", "zope-interface"]
+tests-mypy = ["mypy (>=1.6)", "pytest-mypy-plugins"]
+tests-no-zope = ["attrs[tests-mypy]", "cloudpickle", "hypothesis", "pympler", "pytest (>=4.3.0)", "pytest-xdist[psutil]"]
+
+[[package]]
+name = "colorama"
+version = "0.4.6"
+description = "Cross-platform colored terminal text."
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
+files = [
+    {file = "colorama-0.4.6-py2.py3-none-any.whl", hash = "sha256:4f1d9991f5acc0ca119f9d443620b77f9d6b33703e51011c16baf57afb285fc6"},
+    {file = "colorama-0.4.6.tar.gz", hash = "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44"},
+]
+
+[[package]]
+name = "iniconfig"
+version = "2.0.0"
+description = "brain-dead simple config-ini parsing"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "iniconfig-2.0.0-py3-none-any.whl", hash = "sha256:b6a85871a79d2e3b22d2d1b94ac2824226a63c6b741c88f7ae975f18b6778374"},
+    {file = "iniconfig-2.0.0.tar.gz", hash = "sha256:2d91e135bf72d31a410b17c16da610a82cb55f6b0477d1a902134b24a455b8b3"},
+]
+
+[[package]]
+name = "packaging"
+version = "23.2"
+description = "Core utilities for Python packages"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "packaging-23.2-py3-none-any.whl", hash = "sha256:8c491190033a9af7e1d931d0b5dacc2ef47509b34dd0de67ed209b5203fc88c7"},
+    {file = "packaging-23.2.tar.gz", hash = "sha256:048fb0e9405036518eaaf48a55953c750c11e1a1b68e0dd1a9d62ed0c092cfc5"},
+]
+
+[[package]]
+name = "pluggy"
+version = "1.3.0"
+description = "plugin and hook calling mechanisms for python"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "pluggy-1.3.0-py3-none-any.whl", hash = "sha256:d89c696a773f8bd377d18e5ecda92b7a3793cbe66c87060a6fb58c7b6e1061f7"},
+    {file = "pluggy-1.3.0.tar.gz", hash = "sha256:cf61ae8f126ac6f7c451172cf30e3e43d3ca77615509771b3a984a0730651e12"},
+]
+
+[package.extras]
+dev = ["pre-commit", "tox"]
+testing = ["pytest", "pytest-benchmark"]
+
+[[package]]
+name = "pytest"
+version = "7.2.0"
+description = "pytest: simple powerful testing with Python"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "pytest-7.2.0-py3-none-any.whl", hash = "sha256:892f933d339f068883b6fd5a459f03d85bfcb355e4981e146d2c7616c21fef71"},
+    {file = "pytest-7.2.0.tar.gz", hash = "sha256:c4014eb40e10f11f355ad4e3c2fb2c6c6d1919c73f3b5a433de4708202cade59"},
+]
+
+[package.dependencies]
+attrs = ">=19.2.0"
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
+iniconfig = "*"
+packaging = "*"
+pluggy = ">=0.12,<2.0"
+
+[package.extras]
+testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "pygments (>=2.7.2)", "requests", "xmlschema"]
+
+[metadata]
+lock-version = "2.0"
+python-versions = "^3.11"
+content-hash = "31b3d40c9cc52557b657df28967512319964fdf3447804ba5f543f48ccbf3ef7"
diff --git a/src/args/test-python/pyproject.toml b/src/args/test-python/pyproject.toml
new file mode 100644
index 00000000..09e8e411
--- /dev/null
+++ b/src/args/test-python/pyproject.toml
@@ -0,0 +1,15 @@
+[tool.poetry]
+name = "lint-python-imports"
+version = "0.1.0"
+description = ""
+authors = ["Your Name <you@example.com>"]
+readme = "README.md"
+
+[tool.poetry.dependencies]
+python = "^3.11"
+pytest = "7.2.0"
+
+
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"
diff --git a/src/evaluator/modules/test-python/default.nix b/src/evaluator/modules/test-python/default.nix
index 9cd291e9..d1d1fa55 100644
--- a/src/evaluator/modules/test-python/default.nix
+++ b/src/evaluator/modules/test-python/default.nix
@@ -15,7 +15,6 @@
       inherit (args) extraSrcs;
       inherit (args) extraFlags;
       project = projectPath "/";
-      inherit (args) python;
       inherit (args) searchPaths;
       inherit (args) src;
     };
@@ -34,9 +33,6 @@ in {
             default = [];
             type = lib.types.listOf lib.types.str;
           };
-          python = lib.mkOption {
-            type = lib.types.enum ["3.9" "3.10" "3.11" "3.12"];
-          };
           searchPaths = lib.mkOption {
             default = {};
             type = lib.types.attrs;