diff --git a/pyproject.toml b/pyproject.toml
deleted file mode 100644
index 3b92ef5..0000000
--- a/pyproject.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-[tool.pytest.ini_options]
-pythonpath = [
-  ".",
-  "st2auth_flat_file_backend"
-]
diff --git a/st2auth_flat_file_backend/__init__.py b/st2auth_flat_file_backend/__init__.py
index b877468..10f0377 100644
--- a/st2auth_flat_file_backend/__init__.py
+++ b/st2auth_flat_file_backend/__init__.py
@@ -19,4 +19,4 @@
 
 __all__ = ["FlatFileAuthenticationBackend"]
 
-__version__ = "0.4.0"
+__version__ = "0.4.1"
diff --git a/st2auth_flat_file_backend/flat_file.py b/st2auth_flat_file_backend/flat_file.py
index 539c904..e5ee13b 100644
--- a/st2auth_flat_file_backend/flat_file.py
+++ b/st2auth_flat_file_backend/flat_file.py
@@ -18,10 +18,11 @@
 import bcrypt
 import base64
 import hashlib
-import apr1
 import crypt  # deprecated in 3.11 and removed in 3.13.
 from hmac import compare_digest as compare_hash
 
+from . import apr1
+
 # Reference:    https://httpd.apache.org/docs/2.4/misc/password_encryptions.html
 #               https://akkadia.org/drepper/SHA-crypt.txt