diff --git a/tox_poetry_installer/hooks.py b/tox_poetry_installer/hooks.py
index b95a312..c0d8cef 100644
--- a/tox_poetry_installer/hooks.py
+++ b/tox_poetry_installer/hooks.py
@@ -8,7 +8,6 @@ from typing import List
 from typing import Optional
 
 from poetry.core.packages import Package as PoetryPackage
-from poetry.poetry import Poetry
 from tox import hookimpl
 from tox import reporter
 from tox.action import Action as ToxAction
@@ -104,7 +103,7 @@ def tox_testenv_install_deps(venv: ToxVirtualEnv, action: ToxAction) -> Optional
         )
 
         if not venv.envconfig.skip_install and not venv.envconfig.config.skipsdist:
-            project_deps: List[PoetryPackage] = _find_project_dependencies(
+            project_deps: List[PoetryPackage] = utilities.find_project_dependencies(
                 venv, poetry, package_map
             )
         else:
@@ -127,39 +126,3 @@ def tox_testenv_install_deps(venv: ToxVirtualEnv, action: ToxAction) -> Optional
     utilities.install_to_venv(poetry, venv, dependencies)
 
     return venv.envconfig.require_locked_deps or None
-
-
-def _find_project_dependencies(
-    venv: ToxVirtualEnv, poetry: Poetry, packages: PackageMap
-) -> List[PoetryPackage]:
-    """Install the dependencies of the project package
-
-    Install all primary dependencies of the project package.
-
-    :param venv: Tox virtual environment to install the packages to
-    :param poetry: Poetry object the packages were sourced from
-    :param packages: Mapping of package names to the corresponding package object
-    """
-
-    base_dependencies: List[PoetryPackage] = [
-        packages[item.name]
-        for item in poetry.package.requires
-        if not item.is_optional()
-    ]
-
-    extra_dependencies: List[PoetryPackage] = []
-    for extra in venv.envconfig.extras:
-        try:
-            extra_dependencies += [
-                packages[item.name] for item in poetry.package.extras[extra]
-            ]
-        except KeyError:
-            raise exceptions.ExtraNotFoundError(
-                f"Environment '{venv.name}' specifies project extra '{extra}' which was not found in the lockfile"
-            ) from None
-
-    dependencies: List[PoetryPackage] = []
-    for dep in base_dependencies + extra_dependencies:
-        dependencies += utilities.find_transients(packages, dep.name.lower())
-
-    return dependencies
diff --git a/tox_poetry_installer/utilities.py b/tox_poetry_installer/utilities.py
index 5c44910..1aee525 100644
--- a/tox_poetry_installer/utilities.py
+++ b/tox_poetry_installer/utilities.py
@@ -1,6 +1,7 @@
 """Helper utility functions, usually bridging Tox and Poetry functionality"""
 import sys
 from pathlib import Path
+from typing import List
 from typing import Sequence
 from typing import Set
 
@@ -135,3 +136,39 @@ def check_preconditions(venv: ToxVirtualEnv, action: ToxAction) -> Poetry:
         raise exceptions.SkipEnvironment(
             "Project does not use Poetry for env management, skipping installation of locked dependencies"
         ) from None
+
+
+def find_project_dependencies(
+    venv: ToxVirtualEnv, poetry: Poetry, packages: PackageMap
+) -> List[PoetryPackage]:
+    """Install the dependencies of the project package
+
+    Install all primary dependencies of the project package.
+
+    :param venv: Tox virtual environment to install the packages to
+    :param poetry: Poetry object the packages were sourced from
+    :param packages: Mapping of package names to the corresponding package object
+    """
+
+    base_dependencies: List[PoetryPackage] = [
+        packages[item.name]
+        for item in poetry.package.requires
+        if not item.is_optional()
+    ]
+
+    extra_dependencies: List[PoetryPackage] = []
+    for extra in venv.envconfig.extras:
+        try:
+            extra_dependencies += [
+                packages[item.name] for item in poetry.package.extras[extra]
+            ]
+        except KeyError:
+            raise exceptions.ExtraNotFoundError(
+                f"Environment '{venv.name}' specifies project extra '{extra}' which was not found in the lockfile"
+            ) from None
+
+    dependencies: List[PoetryPackage] = []
+    for dep in base_dependencies + extra_dependencies:
+        dependencies += find_transients(packages, dep.name.lower())
+
+    return dependencies