diff --git a/server/autotest_server/config.py b/server/autotest_server/config.py
index c6893cf8..6a4a6ee6 100644
--- a/server/autotest_server/config.py
+++ b/server/autotest_server/config.py
@@ -14,7 +14,6 @@
 
 
 class _Config:
-
     _replacement_pattern: ClassVar[Pattern] = re.compile(r".*?\${(\w+)}.*?")
     _not_found_key: ClassVar[str] = ""
 
diff --git a/server/autotest_server/testers/java/java_tester.py b/server/autotest_server/testers/java/java_tester.py
index 9222dff8..8b753d20 100644
--- a/server/autotest_server/testers/java/java_tester.py
+++ b/server/autotest_server/testers/java/java_tester.py
@@ -30,7 +30,6 @@ def run(self):
 
 
 class JavaTester(Tester):
-
     JUNIT_TESTER_JAR = os.path.join(os.path.dirname(__file__), "lib", "junit-platform-console-standalone.jar")
     JUNIT_JUPITER_RESULT = "TEST-junit-jupiter.xml"
     JUNIT_VINTAGE_RESULT = "TEST-junit-vintage.xml"
diff --git a/server/autotest_server/testers/py/lib/sql_helper.py b/server/autotest_server/testers/py/lib/sql_helper.py
index b664d029..70f69fe9 100644
--- a/server/autotest_server/testers/py/lib/sql_helper.py
+++ b/server/autotest_server/testers/py/lib/sql_helper.py
@@ -144,7 +144,6 @@ def execute_psql_file(
 
 
 class PSQLTest:
-
     connection: ClassVar[Optional[ConnectionType]] = None
 
     SCHEMA_COPY_STR = """
diff --git a/server/autotest_server/testers/pyta/pyta_tester.py b/server/autotest_server/testers/pyta/pyta_tester.py
index 584e5a4b..767f9f57 100644
--- a/server/autotest_server/testers/pyta/pyta_tester.py
+++ b/server/autotest_server/testers/pyta/pyta_tester.py
@@ -14,7 +14,6 @@ class PytaReporter(python_ta.reporters.json_reporter.JSONReporter, python_ta.rep
 
 
 class PytaTest(Test):
-
     ERROR_MSGS = {"reported": "{} error(s)"}
 
     def __init__(
diff --git a/server/autotest_server/testers/racket/racket_tester.py b/server/autotest_server/testers/racket/racket_tester.py
index d579baa6..fc844923 100644
--- a/server/autotest_server/testers/racket/racket_tester.py
+++ b/server/autotest_server/testers/racket/racket_tester.py
@@ -36,7 +36,6 @@ def run(self) -> str:
 
 
 class RacketTester(Tester):
-
     ERROR_MSGS = {"bad_json": "Unable to parse test results: {}"}
 
     def __init__(self, specs, test_class: Type[RacketTest] = RacketTest) -> None: