diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 1a57643e..6acf322a 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -4,7 +4,7 @@ repos:
     hooks:
       - id: isort
   - repo: https://github.com/psf/black
-    rev: 20.8b1
+    rev: 22.3.0
     hooks:
       - id: black
   - repo: https://gitlab.com/pycqa/flake8
diff --git a/environment.yml b/environment.yml
index 62df5b08..f9890c38 100644
--- a/environment.yml
+++ b/environment.yml
@@ -6,7 +6,7 @@ dependencies:
   - pip
   - fastapi
   - typer
-  - authlib
+  - authlib=0.15.5
   - psycopg2
   - httpx=0.20.0
   - sqlalchemy
diff --git a/quetz/authentication/pam.py b/quetz/authentication/pam.py
index 72ce5a80..6e115d8d 100644
--- a/quetz/authentication/pam.py
+++ b/quetz/authentication/pam.py
@@ -180,6 +180,5 @@ async def authenticate(
 
             return username
 
-
 except ImportError:
     PAMAuthenticator = None  # type: ignore