diff --git a/pyproject.toml b/pyproject.toml
index ffbb9f67..006651b3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,10 +40,11 @@ dependencies = [
 
 
 [project.optional-dependencies]
-test = ["pytest>=7", "waitress", "bcrypt", "argon2-cffi"]
+test = ["pytest>=7", "waitress", "bcrypt", "argon2-cffi", "pam", "ldap3"]
 bcrypt = ["bcrypt"]
 argon2 = ["argon2-cffi"]
 ldap = ["ldap3"]
+pam = ["pam"]
 dev = ["flake8", "isort", "mypy", "pytest", "pytest-playwright", "html5validator"]
 
 [project.scripts]
diff --git a/setup.py.legacy b/setup.py.legacy
index 0f5461e3..2d7855b0 100644
--- a/setup.py.legacy
+++ b/setup.py.legacy
@@ -45,6 +45,7 @@ install_requires = ["defusedxml", "libpass>=1.9.3", "vobject>=0.9.6",
 bcrypt_requires = ["bcrypt"]
 argon2_requires = ["argon2-cffi"]
 ldap_requires = ["ldap3"]
+pam_requires = ["pam"]
 test_requires = ["pytest>=7", "waitress", *bcrypt_requires, *argon2_requires]
 
 setup(
@@ -63,7 +64,7 @@ setup(
     package_data={"radicale": [*web_files, "py.typed"]},
     entry_points={"console_scripts": ["radicale = radicale.__main__:run"]},
     install_requires=install_requires,
-    extras_require={"test": test_requires, "bcrypt": bcrypt_requires, "argon2": argon2_requires, "ldap": ldap_requires},
+    extras_require={"test": test_requires, "bcrypt": bcrypt_requires, "argon2": argon2_requires, "ldap": ldap_requires, "pam": pam_requires},
     keywords=["calendar", "addressbook", "CalDAV", "CardDAV"],
     python_requires=">=3.9.0",
     classifiers=[